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| 1 | Constitutive equation and model validation for a 31 vol.% B_4Cp/6061Al composite during hot compression显示文摘An accurate constitutive equation is essential to understanding the flow behavior of B_4C/Al composites during the hot deformation. However, the constitutive equations developed previously in literature are generally for low strain rate deformation. In the present work, we modified the general constitutive equation and take the high strain rate correction into account. The constitutive equation for a31 vol.% B_4Cp/6061 Al composite was constructed based on the flow stresses measured during isothermal hot compression at temperatures ranging from 375 to 525?C and strain rates from 0.01 to 10 s-1. The experimental flow stresses were corrected by considering temperature-dependent Arrhenius factor. The modified equation was then verified by using DEFORM-3 D finite element analysis to simulate the experimental hot compression process. The results show that the modified equation successfully predicts flow stress, load–displacement, and the temperature rise. This helps to optimize the hot deformation process,and to obtain desirable properties, such as reduced porosity and homogenous particle distribution in B_4C/Al composites. | L. Zhou C. Cui Q.Z. Wang C. Li B.L. Xiao Z.Y. Ma | 2018 | Journal of Materials Science & Technology2018，34，10： | 8 |
| 2 | Effect of Y Addition on Microstructure and Mechanical Properties of Friction Stir Welded ZK60 Alloy显示文摘6 mm thick ZK60 and ZK60-Y alloy plates were successfully friction stir welded (FSW) at a tool rotation rate of 1200 r/min and a traverse speed of 100 mm/min. FSW resulted in the dissolution of MgZn2 particles in the ZK60 and the breakup and dispersion of W-phase (Mg3Zn3Y2) particles in the ZK60-Y alloy, thereby leading to a decrease in the hardness of the nugget zone (NZ) for the ZK60 alloy and an increase in the hardness of the NZ for the ZK60-Y alloy, respectively. While two FSW joints exhibited similar joint effciency (87%-89% of ultimate tensile strengths of the parent materials), the yield strength of the FSW ZK60-Y joint was substantially higher than that of the FSW ZK60 joint. The fracture occurred in the NZ and the heat affected zone for the ZK60 and ZK60-Y joints, respectively, which were consistent with the lowest hardness distribution of the welded joints. | G.M. Xie Z.Y. Ma L. Geng | 2009 | Journal of Materials Science & Technology2009，25，3： | 7 |
| 3 | High Strain Rate Superplasticity in a Micro-grained Al-Mg-Sc Alloy with Predominant High Angle Grain Boundaries显示文摘Friction stir processing (FSP) was applied to extruded Al-Mg-Sc alloy to produce fine-grained microstructure with a grain size of 2.2 μm. Electron backscatter diffraction (EBSD) result showed that the grain boundary misorientation distribution was very close to a random grain assembly for randomly oriented cubes. Superplastic investigations in the temperature range of 425-500 ℃ and strain rate range of 1×10 2 -1×10 0 s -1 showed that a maximum elongation of 1500% was achieved at 475 ℃ and a high strain rate of 1×10 1 s -1 . The FSP Al-Mg-Sc exhibited enhanced superplastic deformation kinetics compared to that predicted by the constitutive relationship for superplasticity in fine-grained aluminum alloys. The origin for enhanced superplastic deformation kinetics in the FSP alloy can be attributed to its high fraction of high angle grain boundaries (HAGBs). The analyses of the superplastic data and scanning electron microscopy (SEM) examinations on the surfaces of deformed specimens indicated that grain boundary sliding is the main superplastic deformation mechanism for the FSP Al-Mg-Sc alloy. | F. C. Liu Z.Y. Ma F. C. Zhang | 2012 | Journal of Materials Science & Technology2012，28，11： | 7 |
| 4 | MICROSTRUCTURE AND MECHANICAL PROPERTIES OF NOVEL 718 SUPERALLOY显示文摘Recently, a novel 718 superalloy with remarkable structural stability at 680℃ has been designed and fabricated by CISRI (Central Iron and Steel Research Institute) etc. Phase identification of novel 718 alloy under the above-mentioned heat-treatment condition was performed using optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Results show that the novel 718 alloy has outstanding structural stability at 680℃. The novel 718 alloy possess excellent structural stability and good mechanical properties, which is attributed to ?’-phase strengthening and also to the specific sandwich structure of the γ’ + γ’’ strengthening phase. | J.H. Du X.D. Lü J.L. Qu Q. Deng J.Y. Zhuang Z.Y. Zhong | 2006 | Acta Metallurgica Sinica(English Letters)2006，19，6： | 6 |
| 5 | Microstructural evolution of aluminum alloy during friction stir welding under different tool rotation rates and cooling conditions显示文摘The microstructural evolution during friction stir welding(FSW) has long been studied only using one single welding parameter. Conclusions were usually made based on the final microstructure observation and hence were one-sided. In this study, we used the 'take-action' technique to freeze the microstructure of an Al-Mg-Si alloy during FSW, and then systematically investigated the microstructures along the material flow path under different tool rotation rates and cooling conditions. A universal characteristic of the microstructural evolution including four stages was identified, i.e. dynamic recovery(DRV), dislocation multiplication, new grain formation and grain growth. However, the dynamic recrystallization(DRX)mechanisms in FSW depended on the welding condition. For the air cooling condition, the DRX mechanisms were related to continuous DRX associated with subgrain rotation and geometric DRX at high and low rotation rates, respectively. Under the water cooling condition, we found a new DRX mechanism associated with the progressive lattice rotation resulting from the pinning of the second-phase particles.Based on the analyses of the influencing factors of grain refinement, it was clearly demonstrated that the delay of DRV and DRX was the efficient method to refine the grains during FSW. Besides, ultra-high strain rate and a short duration at high temperatures were the key factors to produce an ultrafine-grained material. | X.H. Zeng P. Xue L.H. Wu D.R. Ni B.L. Xiao K.S. Wang Z.Y. Ma | 2019 | Journal of Materials Science & Technology2019，35，6： | 6 |
| 6 | Friction stir welding and processing显示文摘 | R.S. Mishra Z.Y. Ma | 2005 | Materials Science & Engineering R2005，，1： | 5 |
| 7 | Effect of Rotation Rate on Microstructures and Mechanical Properties of FSW Mg-Zn-Y-Zr Alloy Joints显示文摘Friction stir welding (FSW) of Mg-Zn-Y-Zr plates with 6 mm in thickness was successfully carried out under a wide range of rotation rates of 600-1200 r/min with a constant traverse speed of 100 mm/min. After FSW, the coarse grains in the parent material (PM) were changed into fine equiaxed recrystallized grains at the nugget zone (NZ). Furthermore, the coarse Mg-Zn-Y particles (W-phase) were broken up and dispersed homogenously into the Mg matrix. With increasing rotation rates, the size of the W-phase particles at the NZ significantly decreased, but the recrystallized grain size tended to increase. The hardness values of the NZs for all the FSW joints were higher than those of the PM, and the lowest hardness values were detected in the heat affected zone (HAZ). The fracture occurred in the thermo-mechanical affected zone (TMAZ) on the advancing side for all the FSW joints in the tensile test, due to the incompatibility of the plastic deformation between the NZ and TMAZ caused by remarkably different orientation of grains and W-phase particles. The strength of FSW joint reaches 90% of that of its PM. | G.M. Xie Z.Y. Ma Z.A. Luo P. Xue G.D. Wang | 2011 | Journal of Materials Science & Technology2011，27，12： | 4 |
| 8 | A novel concept for convective heat transfer enhancement显示文摘 | Z.Y. Guo D.Y. Li B.X. Wang | 1998 | International Journal of Heat and Mass Transfer1998，，14： | 4 |
| 9 | WETTABILITY BETWEEN TiB_2 CERAMIC AND METALS显示文摘Self consistent Field discrete variational Xα( SCF Xα DV) method was used to study the wettabilitybetween TiB2 Ceramic and Metals. The Metals were Ni, Mo, Ni+ Mo, and etc. microstructureof TiB2/ Fe, TiB2/ Niand TiB2/ NiMoinvestigatedby TEM werechosen toidentify the calculation model. The result shows the wetting in the above systems were chemicalreactive wetting ,and can becalculated by SCF Xα DV . Theeffectof active ele ment( Mo) to TiB2/ Ni wettability wasstudied too. | J.Y. Zhang, Z.Y. Fu , W.M Wang , H. Wang and X.M. Min State Key Lab .of Advanced Technologyfor Materials Synthesis and Processing, Wuhan University of Technolo gy, Wuhan 430070 ,China | 1999 | Acta Metallurgica Sinica(English Letters)1999，12，4： | 3 |
| 10 | Transmission Electron Microscopy Study of the Infrared Brazed High-strength Titanium Alloy显示文摘The transmission electron microscopy was employed to investigate the microstructure of infrared brazed highstrength Ti alloy using the Ti-15Cu-15Ni filler metal. Coarse primary Ti2Ni and transformed β-Ti are observed in the 300 s brazed specimen. Blocky Ti2Ni and eutectoid Ti2Cu intermetallics are disappeared from the joint with increasing the brazing time to 1800 s. Both acicular α-Ti and retained β-Ti dominate the entire brazed joint. | Z.Y. Wu R.K. Shiue C.S. Chang | 2010 | Journal of Materials Science & Technology2010，26，4： | 3 |
| 11 | MODELING OF STATIC RECRYSTALLIZATION KINETICS OF Nb-BEARING STEELS显示文摘By using isothermal double hit compression tests and applying the 2% offset method, a new model was developed to predict the microstructural evolution of Nb-bearing steels at temperatures above and below the start temperature of strain-induced precipitation (TP). The TP was developed as a function of true strain, initial austenite grain size and the Nb content. The activation energy of static recrystallization (Qrex) was expressed as a function of the content of different alloy elements. It was found that Nb played the most important role in increasing the value of Qrex. The microstructural observations and measurements confirmed the validity of the model developed in the present investigation. | L.Q. Ma Z.Y. Liu S.H. Jiao X.Q. Yuan D. Wu | 2006 | Acta Metallurgica Sinica(English Letters)2006，19，4： | 3 |
| 12 | LOW CYCLE FATIGUE BEHAVIOR OF AZ91HP ALLOY IN AS HIGHP RESSURE DIE CASTING显示文摘Fully reversed total strain-controlled low-cycle fatigue tests were conducted at room temperature in air to study fatigue behavior of AZ91HP in as high pressure die casting and subsequently heat treatments. All the specimens in different heat histories exhibited cyclic strum hardening in different degrees. It was difficult to distinguish the fatigue behaviors of the die-casting specimens from the solution-aging specimens. However the solution treated specimens showed longerfatigue life at high strum amplitude and shorter fatigue life at low strain amplitude than die-casting and the solution-aging specimens though they had the lowest yield strength with higher strain hardening. Fatigue fracture surfaces for strain amplitude larger than 0.005 showed very similar to those of the monotonic tensile tests. The SEM examination revealed that regions of fatigue crack growth and final fracture could be characterized by quasi-cleavage mech anisms, but some shallow dimples, slip bands and secondary cracks were found on the fracture surface in the fracturs crack growth areas. | Liu, Z. Xu, Y.Y. Wang, Z.G. Wang, Y. Liu, Z.Y. | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，4： | 3 |
| 13 | A high efficiency electrochemical machining method of blisk channels显示文摘 | Z.Y. Xu Q. Xu D. Zhu T. Gong | 2013 | CIRP Annals - Manufacturing Technology2013，，1： | 3 |
| 14 | Safety and radiation-enhancing effect of sodium glycididazole in locoregionally advanced laryngeal cancers previously treated with platinum-containing chemotherapy regimens: A preliminary report显示文摘 | Y.C. Zeng R. Wu Z.G. Xu X.Y. Zhang G.L. Fan L.N. Wu Y.M. Wang S.H. Hao W. Zheng X.D. Chen F. Chi Z.Y. Zhang X. Li X.Y. Jin W. Chen S.L. Wang F.D. Xiao E.Y. Wang X.Q. Dong L.B. Zhang M.X. Jia H.H.X. Xia H.B. Zhang Y. Li | 2009 | Cancer / Radiothérapie2009，，1： | 2 |
| 15 | Linking discrete particle simulation to continuum process modelling for granular matter: Theory and application显示文摘Two approaches are widely used to describe particle systems: the continuum approach at macroscopic scale and the discrete approach at particle scale. Each has its own advantages and disadvantages in the modelling of particle systems. It is of paramount signiflcance to develop a theory to overcome the disadvantages of the two approaches. Averaging method to link the discrete to continuum approach is a potential technique to develop such a theory. This paper introduces an averaging method, including the theory and its application to the particleflow in a hopper and the particle-fluid flow in an ironmaking blast furnace. | H.P. Zhu Z.Y. Zhou Q.F. Hou A.B. Yu | 2011 | Particuology2011，9，4： | 2 |
| 16 | Effect of joint sets on the strength and deformation of rock mass models显示文摘 | Z.Y. Yang J.M. Chen T.H. Huang | 1998 | International Journal of Rock Mechanics and Mining Sciences1998，，1： | 2 |
| 17 | STUDY ON THE PROPERTIES OF DIFFERENT ACTIVATED CARBON FIBERS AND THEIR ADSORPTION CHARACTERISTICS FOR FORMALDEHYDE显示文摘Porous structure and surface chemistry of activated carbon fibers obtained by different precursors and activation methods were investigated. Adsorption isotherms were characterized by nitrogen adsorption at 77K over a relative pressure range from 10-6 to 1. The regularization method according to Density Functional Theory (DFT) was employed to calculate the pore size distribution in the samples. Their specific surface areas were calculated by BET method, micro pore volume and micro porous specific surface area calculated by t-plot method and MPD by Horvath-Kawazoe equation. Micropore volume of rayon-based ACF was higher than that of other samples. The static and dynamic adsorption capacity for formaldehyde on different ACFs was determined. The results show that steam activated Rayon-based ACFs had higher adsorption capacity than that of steam and KOH activated PAN-ACFs. Breakthrough curves illustrated that Rayon-ACFs had longer breakthrough time, thus they possessed higher adsorption capacity for formaldehyde than that of PAN-A CFs. The entire sample had small adsorption capacity and short breakthrough time for water. Rayon-ACFs had excellent adsorption selectivity for formaldehyde than PAN-ACFs. And the samples with high surface areas had relatively high adsorption capacity for formaldehyde. Elemental content of different ACFs were performed. Rayon-based ACFs contained mare oxygen than PAN-ACFs, which may be attributed to their excellent adsorption capacity for formaldehyde. | H.Q. Rong, Z.Y. Ryu and J.T. Zheng (Institute of Coal Chemistry, The Chinese Academy of Sciences, P.O.Box 165, Taiyuan 030001, China) | 2001 | Acta Metallurgica Sinica(English Letters)2001，14，6： | 2 |
| 18 | Effect of non-metallic inclusions on hydrogen-induced cracking of API5L X100 steel显示文摘 | T.Y. Jin Z.Y. Liu Y.F. Cheng | 2010 | International Journal of Hydrogen Energy2010，，15： | 2 |
| 19 | Friction Stir Processing Technology: A Review显示文摘 | Z.Y. Ma | 2008 | Metallurgical and Materials Transactions A2008，，3： | 2 |
| 20 | Effectiveness–thermal resistance method for heat exchanger design and analysis显示文摘 | Z.Y. Guo X.B. Liu W.Q. Tao R.K. Shah | 2010 | International Journal of Heat and Mass Transfer2010，，13： | 2 |
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