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| 1 | Recent developments and applications on high-performance cast magnesium rare-earth alloys显示文摘During the past decades,with the increasing demands in lightweight structural materials,Mg alloys with low density and high performance have been extensively investigated and partly applied in some industries.Especially when rare earth(RE)elements are added as major alloying elements to Mg alloys,the alloy strength and creep resistance are greatly improved,which have promoted several series of Mg-RE alloys.This paper reviews the progress and developments of high-performance Mg-RE alloys in recent years with emphasis on cast alloys.The main contents include the alloy design,melt purification,grain refinement,castability,novel liquid casting and semisolid forming approaches,and the industrial applications or trials made of Mg-RE alloys.The review will provide insights for future developments of new alloys,techniques and applications of Mg alloys. | Guohua Wu Cunlong Wang Ming Sun Wenjiang Ding | 2021 | Journal of Magnesium and Alloys2021，9，1： | 35 |
| 2 | Challenges and Solutions for the Additive Manufacturing of H) Biodegradable Magnesium Implants显示文摘Due to their capability of fabricating geometrically complex structures,additive manufacturing(AM)techniques have provided unprecedented opportunities to produce biodegradable metallic implants—especially using Mg alloys,which exhibit appropriate mechanical properties and outstanding biocompatibility.However,many challenges hinder the fabrication of AM-processed biodegradable Mg-based implants,such as the difficulty of Mg powder preparation,powder splash,and crack formation during the AM process.In the present work,the challenges of AM-processed Mg components are analyzed and solutions to these challenges are proposed.A novel Mg-based alloy(Mg-Nd-Zn-Zr alloy,JDBM)powder with a smooth surface and good roundness was first synthesized successfully,and the AM parameters for Mg-based alloys were optimized.Based on the optimized parameters,porous JDBM scaffolds with three different architectures(biomimetic,diamond,and gyroid)were then fabricated by selective laser melting(SLM),and their mechanical properties and degradation behavior were evaluated.Finally,the gyroid scaffolds with the best performance were selected for dicalcium phosphate dihydrate(DCPD)coating treatment,which greatly suppressed the degradation rate and increased the cytocompatibility,indicating a promising prospect for clinical application as bone tissue engineering scaffolds. | Yinchuan Wang Penghuai Fu Nanqing Wang Liming Peng Bin Kang Hui Zeng Guangyin Yuan Wenjiang Ding | 2020 | Engineering2020，6，11： | 10 |
| 3 | Effects of Ho on the microstructure and mechanical properties of Mg-Zn-Ho-Zr magnesium alloys显示文摘The microstructure and mechanical properties of Mg-Zn-Ho-Zr alloys have been investigated in detail.The grain size of the as-cast Mg-Zn-Ho-Zr alloy was greatly decreased by the addition of Ho,and the grain growth during solution treatment was suppressed by Mg-Zn-Ho phases formed at grain boundaries.These thermally stable Mg-Zn-Ho phases could not completely dissolve into the matrix during solution treatment,and the strengthening effect of solution-plus-ageing treatment weakened.The addition of Ho can greatly enhance the high-temperature elongation of the Mg-Zn-Ho-Zr alloy,but the increase of high-temperature tensile strength was just a little. | LI Daquan WANG Qudong DING Wenjiang | 2011 | Rare Metals2011，30，2： | 8 |
| 4 | Strain Softening and Hardening Behavior in AZ61 Magnesium Alloy显示文摘The deformation behavior of AZ61 Mg alloy during hot deformation has been investigated in wide temperature and strain rate range by a Gleeble simulator. Specimens are deformed in compression in the temperature range of 523~673 K and at strain rates of 0.001~1 s-1. It is found that the flow curves exhibit a peak and then decrease towards steady-state of classical DRX, which decrease with rising temperature and decreasing strain rate. The deformation behavior of the specimens can be attributed to the occurrence of strain hardening and softening. As stress decreases, the strain hardening rate declines at a fast rate when temperature rises or strain rate decreases. The shapes of θ-σ curves indicate some important features such as subgrain formation, the critical stress, the peak stress and steady stress. The onset of DRX can be determined by the point of inflection on θ-σ or Inθ-σ curves. | Haitao ZHOU, Liufa LIU, Qudong WANG, Da LU, Xiaoqin ZENG and Wenjiang DINGNational Engineering Research Center of Light Alloys Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China | 2004 | Journal of Materials Science & Technology2004，20，6： | 7 |
| 5 | Improvement in grain refinement efficiency of Mg-Zr master alloy for magnesium alloy by friction stir processing显示文摘Previous studies have proved that the zirconium(Zr)alloying and grain refining performance of a Mg-Zr master alloy on Mg alloy is closely related to the distribution of Zr particle size,and a Mg-Zr master alloy with more Zr particles in size range of 1-5μm exhibits a better refining efficiency.In this paper,friction stir processing(FSP)was used to modify the Zr particles size distribution of a commercially available Mg-30 wt.%Zr master alloy,and the subsequent grain refinement ability was studied by trials on a typical Mg-3Nd-0.2Zn-0.6Zr(wt.%,NZ30K)alloy.It is found that plenty of large Zr particles in the as-received Mg-30%Zr master alloy are broken by FSP.Grain refinement tests reveal that the refining efficiency of Mg-30%Zr alloy is significantly improved by FSP,which is attributed to the better distribution of Zr particles.The refinement effect by adding 0.6%FSP-ed Mg-30%Zr is approximately equivalent to that by adding 1.0%as-received Mg-30%Zr.Due to the easy and convenient operation of FSP,this study provides a new method to develop a more efficient Mg-Zr refiner. | Chengqi Wang Ming Sun Feiyan Zheng Liming Peng Wenjiang Ding | 2014 | Journal of Magnesium and Alloys2014，2，3： | 7 |
| 6 | Effect of rolling strain on microstructure and tensile properties of dual-phase Mg-8Li-3Al-2Zn-0.5Y alloy显示文摘This study was conducted to discuss the effect of rolling strain on microstructure and tensile properties of dual-phase Mg-8Li-3Al-2Zn-0.5 Y(wt%) alloy, which was prepared by casting, and then homogenized and rolled at 200℃. The rolling process was conducted with 10% reduction per pass and five different accumulated strains, varying from 10% to 70%. The results indicate that the as-cast and as-rolled Mg-8Li-3Al-2Zn-0.5Y alloys are composed of α-Mg, β-Li, AlLi and Al_2Y phases. After rolling process,anisotropic microstructure was observed. a-Mg phase got elongated in both rolling direction and transverse direction with the addition of rolling strain. Consequently, the strength of the alloy in both directions was notably improved whereas the elongation declined, mainly caused by strain hardening and dispersion strengthening. The tensile properties of the as-rolled alloys in the RD, no matter the YS, UTS or the elongation, are higher than those of the TD due to their larger deformation strain and significant anisotropy in the hcp α-Mg phase. In addition, the fracture and strengthening mechanism of the tested alloys were also investigated systematically. | Wencai Liu Shi Feng Zhongquan Li Jiong Zhao Guohua Wu Xianfei Wang Lv Xiao Wenjiang Ding | 2018 | Journal of Materials Science & Technology2018，34，12： | 6 |
| 7 | Grain refinement and orientation of AZ31B magnesium alloy in hot flow forming under different thickness reductions显示文摘An analysis of the hot flow forming of Mg-3.0 Al-1.0 Zn-0.3 Mn(AZ31 B) alloy was conducted by experiments and numerical simulations. The effects of different thickness reductions on the microstructure and mechanical properties were investigated at a temperature of 693 K, a spindle speed of 800 rev/min and a feed ratio of 0.1 mm/rev. Thickness reductions have great influence on the uniformity of microstructure along the radial direction(RD) and the grain sizes become refined and uniform when the thickness reduction reaches 45%. The c-axes of most grains are approximately parallel to the RD, with a slight inclination towards the axial direction(AD). The best mechanical properties with UTS of 280 MPa and YS of 175 MPa near the outer surface while 266 MPa and 153 MPa near the inner surface have been achieved due to grain refinement and texture. Moreover, the material flow behavior and stress/strain distributions for singlepass reductions were studied using the ABAQUS/Explicit software. The calculated results indicate that the materials mainly suffer from triaxial compressive stresses and undergo compressive plastic strain in RD and tensile strains in other directions. The higher stress and strain rate near the outer surface lead to more refined grains than that of other regions along the RD, whereas the orientation of the maximum principal compressive stress leads to a discrepancy of the grain orientations in RD. | Yalian Zhang Fenghua Wang Jie Dong Li Jin Conghui Liu Wenjiang Ding | 2018 | Journal of Materials Science & Technology2018，34，7： | 6 |
| 8 | Basal-plane stacking-fault energies of Mg alloys: A first-principles study of metallic alloying effects显示文摘Generalized stacking-fault energies(GSFEs) of basal-plane stacking faults I1 and I2 in Mg alloys have been studied based on first-principles calculations, where 43 alloying elements were considered. It is found that the most contributing features of alloying elements to GSFEs are bulk modulus, equilibrium volume,binding energy, atomic radius and ionization energy. Both bulk modulus and ionization energy exhibit positive relationships with GSFEs, and the others show opposite relationships. Multiple regressions have been performed to offer a quantitative prediction for basal-plane GSFEs in Mg-X systems. GSFEs, alloying effects of elements and the prediction model established within this work may provide guidelines for new Mg alloys design with better ductility. | Qing Dong Zhe Luo Hong Zhu Leyun Wang Tao Ying Zhaohui Jin Dejiang Li Wenjiang Ding Xiaoqin Zeng | 2018 | Journal of Materials Science & Technology2018，34，10： | 4 |
| 9 | Effects of Zr,Ti and Sc additions on the microstructure and mechanical properties of Al-0.4Cu-0.14Si-0.05Mg-0.2Fe alloys显示文摘The evolution of microstructure and mechanical properties of Al-0.4 Cu-0.14 Si-0.05 Mg-0.2 Fe(wt.%)alloys, micro-alloyed with Zr, Ti and Sc, were investigated. The addition of 0.2%Zr to base alloy accelerates the precipitation of Si-rich nano-phase in α-Al matrix, which plays an important role in improving the mechanical properties of an alloy. The tensile strength increases from 102 MPa for the base alloy to 113 MPa for the Zr-modified alloy. Adding 0.2%Zr + 0.2%Ti to base alloy effectively refines a-Al grain size and accelerates the precipitation of Si and Cu elements, leading to heavy segregation at grain boundary.By further adding 0.2%Sc to Zr + Ti modified alloy, the segregation of Si and Cu elements is suppressed and more Si and Cu precipitates appeared in α-Al matrix. Accompanied with the formation of coherent Al_3Sc phase, the tensile strength increases from 108 MPa for the Zr + Ti modified alloy to 152 MPa for the Sc-modified alloy. Due to excellent thermal stability of Al_3Sc phase, the Sc-modified alloy exhibits obvious precipitation hardening behavior at 350℃, and the tensile strength increases to 203 MPa after holding at 350 ℃ for 200 h. | Jian Feng Bing Ye Lijie Zuo Ruijuan Qi Qudong Wang Haiyan Jiang Rong Huang Wenjiang Ding Jie Yao Chuntao Wang | 2018 | Journal of Materials Science & Technology2018，34，12： | 3 |
| 10 | Stepwise decomposition and relative radiometric normalization for small footprint LiDAR waveform显示文摘As an advanced generation instrument of earth observation,small footprint full waveform light detection and ranging(LiDAR) technology has been widely used in the past few years.Decomposition and radiative correction is an important step in waveform data processing,it influences the accuracy of both information extraction and further applications.Based on a stepwise strategy,this study adopts Gaussian mixture model to approximate the LiDAR waveform.In addition to waveform decomposition,a relative correction model is proposed in this paper,the model considers the transmit pulses as well as the different of the travel path for implementing LiDAR waveform relative correction.Validation of the stepwise decomposition and relative correction model are carried out on LiDAR waveform acquired over Zhangye,China.The results indicate that stepwise decomposition identified the number of peaks in LiDAR waveforms,center position and width of each peak well.The relative radiometric correction also improves the similarity of waveforms which acquired at the same target. | QIN YuChu LI Bin NIU Zheng HUANG WenJiang WANG ChangYao | 2011 | Science China Earth Sciences2011，54，4： | 3 |
| 11 | Fabrication of ultra-high strength magnesium alloys over 540 MPa with low alloying concentration by double continuously extrusion显示文摘We prepare a new type of patented biodegradable biomedical Mg-Nd-Zn-Zr(JDBM)alloy system and impose double continuously extrusion(DCE)processing.The lowest processing temperature is 250℃for JDBM-2.1Nd and 310℃for JDBM-2.8Nd,which increases with the Nd concentration.The highest yield strength of 541 MPa is achieved in JDBM-2.1 Nd samples when extruded at 250℃and the elongation is about 3.7%.Moreover,the alloy with a lower alloying element content can reach a higher yield strength while that with a higher alloying element content can reach a larger elongation after DCE processing.However,when extruded under the same conditions,the alloy with a higher alloying contents exhibits better tensile properties. | Hua Huang Hongwei Miao Guangyin Yuan Zhongchang Wang Wenjiang Ding | 2018 | Journal of Magnesium and Alloys2018，6，2： | 3 |
| 12 | A comparative study of Mg-Gd-Y-Zr alloy cast by metal mould and sand mould显示文摘The differences of the microstructure and mechanical property between metal mould and sand mould cast Mg-10Gd-3Y-Zr alloy were investigated both under as-cast condition and after solution heat treatment.In the as-cast specimens,the microstructure is similar and composed of α-Mg solid solution and eutectic compound of α-Mg+ Mg24(Gd,Y) 5;whereas the grain size using metal mould and sand mould is 27 μm and 71 μm,respectively.The eutectic compound of metal mould cast alloy was completely dissolved after solution treated at 500℃ for 8 h,however it needs higher temperature(525 ℃) and longer time(12 h) to achieve the absolute dissolving under sand mould condition.In contrast to metal mould,the peak time of sand mould alloy aged at 225 ℃ and 250 ℃ of was advanced by 4 h and 6 h,respectively.The precipitation reaction sequence in sand mould cast Mg-10Gd-3Y-Zr alloy during isothermal ageing at 250 ℃ follows S.S.S.S.→β″(D019) →β'(cboc) →β1(fcc) →β(fcc) ,which is similar to that in the alloy cast using metal mould. | Wang Qilong Wu Guohua Hou Zhengquan Chen Bin Zheng Yun Ding Wenjiang | 2010 | China Foundry2010，7，1： | 3 |
| 13 | Precipitation modification in cast Mg-1Nd-1Ce-Zr alloy by Zn addition显示文摘The effects of different Zn addition(0,0.2,0.5,1.0 wt%)on the microstructure and mechanical properties of cast Mg-1Nd-1Ce-Zr alloy in as-cast,solution-treated and 200℃peak-aged conditions were studied.Precipitates in cast Mg-1Nd-1Ce-Zr alloy are significantly modified by the Zn addition.In the Zn-free alloy,the disk-shaped prismatic precipitates and the point-like precipitates are the main strengthening phases.When 0.2 Zn is added,the disk-shaped precipitates are refined and very fine basal precipitates form additionally.When 0.5 Zn is added,the basal precipitates become the main strengthening phase.Further increasing the Zn addition to 1.0%,only spare basal precipitates and point-like precipitates exist.The 0.5 Zn addition alloy has the highest strength at room temperature,whose yield strength,ultimate tensile strength and elongation in T6 condition are 136 MPa,237 MPa and 9%,respectively. | Yiyuan Zhou Penghuai Fu Liming Peng Dan Wang Yingxin Wang Bin Hu Ming Liu Anil K.Sachdev Wenjiang Ding | 2019 | Journal of Magnesium and Alloys2019，7，1： | 2 |
| 14 | Microstructure and mechanical properties of repair welds of low-pressure sand-cast Mg?Y?RE?Zr alloy by tungsten inert gas welding显示文摘The sand castings of Mg-Y-RE-Zr series alloys are widely utilized in the large scales and complex shapes in the aerospace industry,as a result of which there are always some cast defects in the products. In this study, the feasibility of repair welding of sand-cast Mg-4 Y-3 RE-0.5 Zr alloy by tungsten inert gas(TIG) welding was scrutinized with different welding currents from 150 to 210 A. The results indicated that defect-free repaired joints with good appearance could be acquired at 170 and 190 A. Interestingly, the grain size of the fusion zone(FZ) was refined initially and then increased with the linear increment of welding current. Because at the higher heat inputs, although the cooling rate of the molten pool was reduced, substantial constitutional supercooling for the grain refinement was attained after the Zr particles were transformed into Zr solutes. The tensile strength of the repaired joint at 170 A was 195 MPa with the maximum joint efficiency of 87.8%, and the elongation reached to 124.4% of the sand-cast base material(BM). However, serious grain coarsening and continuous eutectic structures generated in heat-affected zone(HAZ) above 190 A resulted in the weakening of the joint due to the brittle intergranular fracture. | Xin Tong Guohua Wu Liang Zhang Yingxin Wang Wencai Liu Wenjiang Ding | 2022 | Journal of Magnesium and Alloys2022，10，1： | 2 |
| 15 | Effects of Gd Addition on the Microstructure and Tensile Properties of Mg–4Al–5RE Alloy Produced by Three Different Casting Methods显示文摘This work deals with the effect of 0.67 wt%Gd addition on the microstructure and tensile properties of Mg–4 Al–5 RE(where RE represents La–Ce mischmetal)alloy produced by sand casting(SC),permanent mold casting(PMC),and high-pressure die casting(HPDC).The results show that Gd addition could refine the grains,but its efficiency decreases by increasing the cooling rate due to the shifting from SC to PMC and finally to the HPDC method.Meanwhile,the acicular Al11 RE3 phase is modified into the short-rod or granular-like shape under the three casting conditions.Such refined and modified microstructures are due to the Al2(Gd,RE)phases,which act as the nucleation sites in both theα-Mg matrix and Al11 RE3 phase.Also,the weakening grain refinement effect in the increased cooling rates can be attributed to the narrow constitutional undercooling zone.After Gd addition,the 0.2%proof strength of the SC and PMC alloys increases by about 16.9%and 12.7%,respectively,while in the HPDC alloy,it decreases by about 5.9%.The main factor in the strength increment of the SC and PMC alloys is the grain boundary strengthening due to grain refinement which is proved by modeling the related mechanisms,whereas weak secondary phases and grain boundary strengthening mechanisms in the HPDC alloy lead to strength reduction.After Gd addition,the elongation to failure of the SC,PMC,and HPDC alloys is significantly enhanced by about 34.8%,20.2%,and 12.3%,respectively,due to the crack resistance nature of the modified short-rod/granular Al11(RE,Gd)3 phase compared to the acicular one. | Jie Wei Qudong Wang Li Zhang Mahmoud Ebrahimi Haiyan Jiang Wenjiang Ding | 2021 | Acta Metallurgica Sinica(English Letters)2021，34，10： | 2 |
| 16 | Identification and Gene Mapping of Completely Dominant Earliness in Rice显示文摘The completely dominant earliness was identified in a genic male-sterile and early maturing indica line 6442S-7. F1 progenies from 6442S-7 crossed with thirteen various types of medium- or latematuring varieties, shared the same heading date as 6442S-7. The segregation of heading date in the F2 and B1F1 populations showed that the earliness of 6442S-7 is mainly controlled by two dominant major genes. The local linkage map of one dominant earliness gene harbored in 6442S-7 was constructed with F2 population and four kinds of molecular marker techniques. The results showed that the gene was located between a RFLPmarker C515 and a RAPD marker OPI 11. 557 on the terminal region of short arm of rice chromosome 3,10.9cM and 1.5 cM from C515 and OPI11. 557, respectively. The genetic distances from the target gene to twoSSR markers, RM22 and RM231, and one AFLP marker, PT671, were 3.0, 6.7 and 12.4 cM, respectively. This gene, being identified and mapped first, is designated tentatively as Ef-cd (t). As a new genetic resource of completely dominant earliness, 6442S-7 has splendid future in rice improvement. | DENG Xiao-jian, ZHOU Kai-da, LI Ren-duan, CHUN Ze LI Ping, WANG Wen-ming, ZHAI Wen-xue and ZHU Li-huang( Rice Research Institute, Sichuan Agricultural University, Wenjiang 611130 Institute of Genetics, Chinese Academy of Sciences, Beijing 100101) | 2002 | Agricultural Sciences in China2002，1，1： | 2 |
| 17 | Preparation of superhydrophobic silica film on Mg–Nd–Zn–Zr magnesium alloy with enhanced corrosion resistance by combining micro-arc oxidation and sol–gel method显示文摘 | Shaohua Wang Xingwu Guo Yijun Xie Lihua Liu Haiyan Yang Rongyu Zhu Jia Gong Liming Peng Wenjiang Ding | 2012 | Surface & Coatings Technology2012，，： | 2 |
| 18 | Treatment of Unresectable Advanced Gastric Cancer Using lodine-125 Brachytherapy显示文摘OBJECTIVE The purpose of the study was to examine the efficacy of treating patients with advanced gastric cancer using iodine -125 (125I) brachytherapy. METHODS Ten patients with unresectable advanced gastric cancer were selected based on their pattern of CT scans. We utilized a brachytherapy planning system to determine the distribution of the 125I seeds, their activity and quantity. The matched peripheral dose (MPD) was 110-135 Gy. 125I seeds were implanted in a single plane or biplane by an intraoperative small incision or percutaneous puncture. The post- operative hemogram, CT, KPS, pain-relieving period and survival period were recorded. RESULTS One patient developed a complete response (CR), 4 patients a partial response (PR), 3 patients showed no change (NC) and 2 pa- tients developed progressive disease (PD). The overall response rate (CR+PR) was 50% (5/10). The pain-relieving rate was 89% (8/9). The pa- tients’ appetite and KPS were improved. The longest survival period was 10 months and median life span was 4 months. There were 8 patients whose seeds fell off resulting in an expulsion rate of 3.8% (26/692). The patients showed 0-1 degree acute radio-therapeutic side-effects without other symptoms such as abdominal pain, vomitus cruentes or intestinal obstruction etc. CONCLUSION Applying 125I implantation to treat advanced gastric can- cer with a reasonable seed distribution can significantly improve clinical symptoms and their quality of life. The radioactive damage is mild. This method can be used as an important supplementary treatment for unre- sectable advanced gastric cancer. | Juan Wang Aixia Sui Yitao Jia Binjian Xu Liang Wei Junqing Chen Wenjiang Shen | 2006 | Chinese Journal of Clinical Oncology2006，3，3： | 2 |
| 19 | Application of Drucker–Prager plasticity to predict fracture in rectangular cup drawing of AZ31 alloy sheet显示文摘 | Fenghua Wang Jie Dong Miaolin Feng Xingwei Zheng Wenjiang Ding | 2011 | Materials Science & Engineering A2011，，： | 1 |
| 20 | High temperature deformation behavior of permanent casting AZ91 alloy with and without Sb addition显示文摘 | Yuan Guangyin Wang Qudong Ding Wenjiang | 2002 | Journal of Materials Science2002，，1： | 1 |
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