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| 1 | Effect of carbon addition on the microstructure and mechanical properties of CoCrFeNi high entropy alloy显示文摘The effects of C element on the microstructure and properties of CoCrFeNiCx high entropy alloys(x denoted the atomic fraction of C element at 0, 0.05, 0.1, 0.2, 0.3, and 0.5) were investigated. The equal molar CoCrFeNi alloy with FCC structure exhibits high ductility but weak strength. With the addition of C element, both the hardness and strength of the CoCrFeNiCx high entropy alloys increase as well as the wear resistance. The solution strengthening and the formation of hard carbide phase are the main factor for the improved strength, hardness and wear resistance of CoCrFeNiCx high entropy alloys. | HUANG TianDang JIANG Li ZHANG ChangLiang JIANG Hui LU YiPing LI TingJu | 2018 | Science China(Technological Sciences)2018，61，1： | 22 |
| 2 | A promising new class of irradiation tolerant materials:Ti_2ZrHfV_(0.5)Mo_(0.2) high-entropy alloy显示文摘Recently, high-entropy alloys(HEAs) or multi-principal-element alloys with unprecedented physical,chemical, and mechanical properties, have been considered as candidate materials used in advanced reactors due to their promising irradiation resistant behavior. Here, we report a new single-phase bodycentered cubic(BCC) structured Ti_2 ZrHfV_(0.5)Mo_(0.2) HEA possessing excellent irradiation resistance, i.e.,scarcely irradiation hardening and abnormal lattice constant reduction after helium-ion irradiation,which is completely different from conventional alloys. This is the first time to report the abnormal XRD phenomenon of metallic alloys and almost no hardening after irradiation. These excellent properties make it to be a potential candidate material used as core components in next-generation nuclear reactors. The particular irradiation tolerance derives from high density lattice vacancies/defects. | Yiping Lu Hefei Huang Xuzhou Gao Cuilan Ren Jie Gao Huanzhi Zhang Shijian Zheng Qianqian Jin Yonghao Zhao Chenyang Lu Tongmin Wang Tingju Li | 2019 | Journal of Materials Science & Technology2019，35，3： | 23 |
| 3 | Hydrometallurgical purification of metallurgical grade silicon显示文摘The effects of the particle size of ground metallurgical grade silicon (MG-Si), the sort of acids, and the type of stirring on the purified efficiency of MG-Si were investigated. It was found that a particle size less than 0.1 mm was most effective for acid leaching; the extraction yield of impurities was increased by 9% with HF leaching compared with HCl leaching and HNO3 leaching, and increased by 7% with ultrasonic stirring compared with mechanical stirring. The principle of hydrometallurgical purification of metallurgical grade silicon under ultrasonic fields was also discussed. | MA Xiaodong ZHANG Jian WANG Tongmin LI Tingju | 2009 | Rare Metals2009，28，3： | 20 |
| 4 | Effect of Niobium on Microstructure and Properties of the CoCrFeNb_xNi High Entropy Alloys显示文摘A series of CoCrFeNb_xNi(x values in molar ratio, x = 0, 0.25, 0.45, 0.5, 0.75, 1.0 and 1.2) high entropy alloys(HEAs) was prepared to investigate the alloying effect of Nb on the microstructures and mechanical properties. The results indicate that the prepared CoCrFeNb_xNi(x > 0) HEAs consist of a simple FCC solid solution phase and a Laves phase. The microstructures of the alloys change from an initial single-phase FCC solid solution structure(x = 0) to a hypoeutectic microstructure(x = 0.25), then to a full eutectic microstructure(x = 0.45) and finally to a hypereutectic microstructure(0.5 < x < 1.2). The compressive test results show that the Nb0.45(x = 0.45) alloy with a full eutectic microstructure possesses the highest compressive fracture strength of 2558 MPa and a fracture strain of 27.9%. The CoCrFeNi alloy exhibits an excellent compressive ductility, which can reach 50% height reduction without fracture. The Nb0.25 alloy with a hypoeutectic structure exhibits a larger plastic strain of 34.8%. With the increase of Nb content, increased hard/brittle Laves phase leads to a decrease of the plasticity and increases of the Vickers hardness and the wear resistance. The wear mass loss, width and depth of wear scar of the Nb1.2(x = 1.2) alloy with a hypereutectic structure are the lowest among all alloy systems, indicating that the wear resistance of the Nb1.2 alloy is the best one. | Hui Jiang Li Jiang Dongxu Qiao Yiping Lu Tongmin Wang Zhiqiang Cao Tingju Li | 2017 | Journal of Materials Science & Technology2017，33，7： | 15 |
| 5 | Effect of ultrasonic treatment and Sr addition on microstructure of Al-20%Si alloy显示文摘Many investigations have revealed that transition of melt structure can effectively infl uence the fi nal solidifi cation microstructures.In this study,ultrasonic treatment was applied to Al-20%Si melt and Sr-modif ied Al-20%Si melt at 720℃(i.e.above liquidus of about 690℃)for 60 s,and then the melt was quickly quenched to room temperature.Experimental results show that ultrasonic treatment can ref ine the primary Si phase andα-Al of Al-20%Si alloy;strontium can make the morphology of Si phase spheroidized and refi ned as Sr addition changes the faceted growth characteristic of Si phase;however,the ref inement effect of ultrasonic treatment on the primary Si phase andα-Al is weakened by Sr addition. | Miao Long Lu Yiping Zhang Yubo Fu Ying Li Tingju | 2013 | China Foundry2013，10，4： | 10 |
| 6 | Microstructure and Mechanical Properties of a CoFeNi_2V_(0.5)Nb_(0.75) Eutectic High Entropy Alloy in As-cast and Heat-treated Conditions显示文摘The eutectic CoFeNi_2V_(0.5)Nb_(0.75) high entropy alloys(HEAs) were heated at 500, 600, 700, 800 and 1000 ℃,respectively for 6 h and subsequently quenched in the water to investigate their thermal stability and phase transformation at high temperature. The microstructure and mechanical properties of the samples were investigated by scanning electron microscopy, X-ray diffraction, compressive and hardness tests. It was found that the as-cast CoFeNi_2V_(0.5)Nb_(0.75) HEAs showed a eutectic microstructure with alternating fcc solid solution phase and Fe_2Nb-type Laves phase. The NbNi_4-type intermetallic phase appeared when the heat-treated temperature was higher than 600 ℃. With increasing quenching temperature, the volume fraction of the NbNi_4-type intermetallic phase increased while that of the eutectic regions decreased.The sample quenched at 800 ℃ showed the most excellent comprehensive mechanical properties; its fracture strength, yield strength and plastic strain were as high as 2586.76 MPa, 2075.18 MPa and 16.73%,respectively. Moreover, the eutectic CoFeNi_2V_(0.5)Nb_(0.75) HEAs exhibited apparent age hardening, especially quenched at 700 ℃, the hardness reached up to the maximum value of HV 727.52. | Li Jiang Yiping Lu Wei Wu Zhiqiang Cao Tingju Li | 2016 | Journal of Materials Science & Technology2016，32，3： | 10 |
| 7 | Enhanced antibacterial behavior of a novel Cu-bearing high-entropy alloy显示文摘Contact infection of bacteria and viruses has been a critical threat to human health. The worldwideoutbreak of COVID-19 put forward urgent requirements for the research and development of the selfantibacterial materials, especially the antibacterial alloys. Based on the concept of high-entropy alloys, thepresent work designed and prepared a novel Co_(0.4)FeCr_(0.9)Cu_(0.3) antibacterial high-entropy alloy with superior antibacterial properties without intricate or rigorous annealing processes, which outperform the antibacterial stainless steels. The antibacterial tests presented a 99.97% antibacterial rate against Escherichiacoli and a 99.96% antibacterial rate against Staphylococcus aureus after 24 h. In contrast, the classic antibacterial copper-bearing stainless steel only performed the 71.50% and 80.84% antibacterial rate, respectively. The results of the reactive oxygen species analysis indicated that the copper ion release and theimmediate contact with copper-rich phase had a synergistic effect in enhancing antibacterial properties.Moreover, this alloy exhibited excellent corrosion resistance when compared with the classic antibacterialstainless steels, and the compression test indicated the yield strength of the alloy was 1015 MPa. Thesefindings generate fresh insights into guiding the designs of structure-function-integrated antibacterial alloys. | Guangyu Ren Lili Huang Kunling Hu Tianxin Li Yiping Lu Dongxu Qiao Haitao Zhang Dake Xu Tongmin Wang Tingju Li Peter K.Liaw | 2022 | Journal of Materials Science & Technology2022，，22： | 6 |
| 8 | Study of ultrahigh-purity copper billets refined by vacuum melting and directional solidification显示文摘The purpose of this paper is to study large-sized copper billets refined with 5N ultrahigh purity after vacuum melting and directional solidifi-cation (VMDS). The precise impurity analysis of copper billets was carried out with a glow discharge mass spectrometer (GDMS). The re-sults demonstrate that the total concentration of twenty-two impurities is decreased by 63.1wt.%-66.5 wt.%. Ag, P, S, Na, Mg, Se, Zn, In and Bi are easy to be removed due to lgPimp - lgPCu > 1.5, and they can be removed effectively under the vacuum condition of 1650-1700 K for 30 min. The electrical conductivity of 5N copper is higher than that of the raw material as the impurity concentrations decrease. The segrega-tion effect in directional solidification can be remarkable when the equilibrium distribution coefficient (k0) value is less than 0.65 due to the strong affinity of Cu for some metallic and non-metallic impurities. | FU Yabo CHEN Jie LIU Ning LU Yiping LI Tingju YIN Guomao | 2011 | Rare Metals2011，30，3： | 6 |
| 9 | Mechanical Properties Improvement of AlCrFeNi_2Ti_(0.5) High Entropy Alloy through Annealing Design and its Relationship with its Particle-reinforced Microstructures显示文摘High entropy alloy has attracted increasing attentions.However,to enhance the alloy strength often leads to impairment of the ductility,or vice versa.Here we reported a heat treatment approach on AlCrFeNi2Ti0.5 high entropy alloy,which can elevate the strength and ductility simultaneously.An ingot of AlCrFeNi2Ti0.5 weighing 2.5 kg was firstly fabricated by medium frequency induction melting.Then samples from the same height of the bulk ingot were annealed for 6 h at 600,700,800 and 1000 ℃,respectively.After 1000 ℃ annealing,an optimal microstructure was obtained by using our approach which can make some precipitation particles distribute homogeneously in the dendrite interior while keep the interdendrite structure as a single solid solution phase.The mechanical test on this AlCrFeNi2Ti0.5 alloy sample showed that,the compressive fracture strength σbc was increased by about600 MPa and the plastic strain ep was doubled,compared with those of the as-cast sample.Our approach can be readily adapted to large-scale industrial production of high entropy alloys with high strength and ductility by proper annealing treatment. | Li Jiang Hui Jiang Yiping Lu Tongmin Wang Zhiqiang Cao Tingju Li | 2015 | Journal of Materials Science & Technology2015，31，4： | 6 |
| 10 | Microstructure and mechanical properties of C_(x)Hf_(0.25)NbTaW_(0.5) refractory high-entropy alloys at room and high temperatures显示文摘The microstructure and mechanical properties of as-cast and isothermally annealed C_(x)Hf_(0.25)NbTaW_(0.5)(x=0,0.05,0.15,0.25)refractory high-entropy alloys(RHEAs)were studied.Both the as-cast and annealed RHEAs consisted of disordered body-centered cubic solid solution phase and metal carbide(MC)phase with a face-centered cubic crystal structure(Fm-3 m space group).The primary carbides were enriched with Hf and C elements and tended to form lamellar eutectic-like microstructure in the interdendrites.The lamellar eutectic-like structure in the interdendrites would be formed from the decomposition of sub-carbide M_(2)C under the influence of Hf element.After isothermal annealing,slatted carbides were precipitated on the matrix,and the distribution became more uniform with high C content.The formation of carbides strongly influenced the mechanical properties both at room and high temperatures.The yield strength values of C_(x)Hf_(0.25)NbTaW_(0.5) RHEA at 1473 and 1673 K were 792 and 749 MPa,respectively.The result had exceeded the high temperature mechanical properties of currently known RHEAs.Moreover,this RHEA exhibited high-temperature performance stability and excellent plasticity,exceeding 30 and 50%at room and elevated temperatures(above 1273 K),respectively.During thermal deformation,carbon-containing RHEAs obtained more severe work hardening than that of ACHO RHEAs,and required greater dynamic recrystallization to achieve the dynamic equilibrium. | Shiyu Wu Dongxu Qiao Haitao Zhang Junwei Miao Hongliang Zhao Jun Wang Yiping Lu Tongmin Wang Tingju Li | 2022 | Journal of Materials Science & Technology2022，，2： | 4 |
| 11 | Ductile and ultrahigh-strength eutectic high-entropy alloys by large-volume 3D printing显示文摘1.Introduction Additive manufacturing or 3D printing outweighs conventional casting methods in the aspect of complex parts fabrication,which can realize one-step formation without the need of complicated cast dies.3D printing significantly promotes industrial production for making near-net shaped components.However,this promising technique is not always ideally applicable for metals and alloys.For example,titanium alloys prepared by 3D printing often suf-fer from poor plasticity,and usually require further complex heat treatment or hot isostatic pressing treatment,in order to remove internal stress and regulate plasticity and strength[1,2],which de-feats the original intention of employing additive manufacturing.One of the fundamental causes for such issues is the low fluidity of the alloys upon melting,leading to great chemical heterogeneity,high porosity content and residual stresses.This limitation hinders further design and fabrication of high-performance printable alloys from large scale production and application. | Yiping Lu Xiaoxiang Wu Zhenghong Fu Qiankun Yang Yong Zhang Qiming Liu Tianxin Li Yanzhong Tian Hua Tan Zhiming Li Tongmin Wang Tingju Li | 2022 | Journal of Materials Science & Technology2022，，31： | 4 |
| 12 | Mould taper optimization for continuous casting steels by numerical simulation显示文摘A transient,two-dimensional,coupled finite element model was employed to simulate the solidification and shrinkage of continuous casting steels by means of ANSYSTM.In the model,a gap-dependent heat transfer condition was introduced to modify the heat flux function,and the variations of material thermal properties,mechanical properties as well as the yield function with temperature were considered.The solidification and shrinkage processes of four round billets and two square billets were simulated by indirect coupled method.Simulation results show that carbon content,pouring temperature,casting speed and shape of billets have distinct influence on the solidification shrinkage of billets.Ideal continuous parabolic tapers were designed and optimized according to the calculated shrinkage curves of billets. | Wang Tongmin Cai Shaowu Li Jun Xu Jingjing Chen Zongning Zhu Jing Cao Zhiqiang Li Tingju | 2010 | China Foundry2010，7，1： | 4 |
| 13 | Phase selection during solidification of undercooled Ni_(70.2)Si_(29.8) eutectic alloy显示文摘在冷却下面的高度(大约 392 K ) 在体积被完成最容易溶解的 Ni 70.2 Si 29.8 合金通过与周期的过热相结合的玻璃 fluxing 融化。这被发现亚稳的阶段 Ni 3 Si 2 并且非最后被获得通过慢团结以后什么时候在冷却下面超过 240 K。亚稳的阶段被使用 X 光检查衍射和微分扫描热量测定(DSC ) 的方法证实。基于免费精力最小和短暂成核理论的原则,阶段选择融化在凉下来的最容易溶解的 Ni 70.2 Si 29.8 融化。从在凉下来的 Ni 70.2 Si 29.8 融化被归功于到竞争成核与在冷却下面,即在冷却下面的高度便于亚稳的阶段的优先的成核。 | Yiping Lu Tingju Li Fu Yabo Sun Jianbo LUO Dawei Gencang Yang Yaohe Zhou | 2009 | Progress in Natural Science:Materials International2009，19，11： | 4 |
| 14 | Semisolid-rolling and annealing process of woven carbon fibers reinforced Al-matrix composites显示文摘Semisolid-rolling method was successfully developed to prepare the Ni-coated woven carbon fibers reinforced Al-matrix composite. Due to the appropriate matrix flowability and rolling pressure, the Al-matrix could infiltrate into the woven fibers sufficiently and attach to the reinforcements closely forming a smooth interface. The rolling speed of 4 rad/min offered a subtle equilibrium between the heat transfer and the material deformation. The covering matrix should be controlled at semisolid state to provide a better infiltration behavior and a protective effect on the carbon fibers. With the addition of fibers, an improvement for more than 25% was obtained in the bending strength of the materials. Furthermore, the woven carbon fibers could strengthen the composite in multiple directions, rather than only along the fiber longitudinal directions. The annealing process promoted the Ni coating to react with and to diffuse into the matrix, resulted in an obvious increase of the bending strength. | Junjia Zhang Shichao Liu Yiping Lu Li Jiang Yubo Zhang Tingju Li | 2017 | Journal of Materials Science & Technology2017，33，7： | 3 |
| 15 | Microstructure and mechanical properties of Al–1Mn and Al–10Si alloy circular clad ingot prepared by direct chill casting显示文摘 | Ying Fu Jinchuan Jie Li Wu Joonpyo Park Jianbo Sun Jongho Kim Tingju Li | 2013 | Materials Science & Engineering A2013，，： | 3 |
| 16 | Composition,Microstructure,Phase Constitution and Fundamental Physicochemical Properties of Low-Melting-Point Multi-Component Eutectic Alloys显示文摘Low-melting-point alloys have an extensive applications in the fields of materials processing, phase change energy storage, electronic and electrical automatic control, continuous casting simulation, welding, etc.Specifically, the eutectic compositions make up a large number of low-melting-point alloys that are exploited because of their desirable features like single melting peaks, excellent operational reliability, and casting fluidity. However, the fundamental physicochemical properties from the current available literature on low-melting-point multi-component eutectic alloys(LMP-MCEAs) are rather rare and lowly accurate, including the exact melting temperatures and compositions, constituent phases, microstructures and morphologies, melting enthalpies, specific heats, densities, and so on. This lack of information seriously limits the development and application of low-melting-point multi-component eutectic alloys.In this paper, the low-melting-point multi-component eutectic alloys composed of Bi, Cd, Sn, Pb, and In elements synthesized by high vacuum induction melting and fundamental data were investigated by scanning electron microscopy(SEM), energy dispersive spectrometry(EDS), X-ray diffraction(XRD), differential scanning calorimetry(DSC), and density analysis instrument. Most of the LMP-MCEAs with complex eutectic morphology structures and XRD diffraction patterns could be explained with the fact that they were three-phase eutectic alloys with mixed growth way. Generally, LMP-MCEAs present an extremely low melting point between 48.3 and 124 °C and high density between 8 and 10 g/cm3. | Kaiyao Zhou Zhongyi Tang Yiping Lu Tongmin Wang Haipeng Wang Tingju Li | 2017 | Journal of Materials Science & Technology2017，33，2： | 3 |
| 17 | Grain refinement of superalloy IN100 under the action of rotary magnetic fields and inoculants显示文摘 | Wenzhong Jin Fudong Bai Tingju Li Guomao Yin | 2007 | Materials Letters2007，，10： | 2 |
| 18 | Three dimensional microstructures and wear resistance of Al-Bi immiscible alloys with different grain refiners显示文摘The three dimensional(3D) microstructures of Al-Bi alloys with different grain refiners(Al-5Ti-B, Al-3B and Al-3Ti) have been studied using synchrotron X-ray microtomography. The relationships between the microstructures and the corresponding wear behavior are verified through the friction and wear tests. The worn surfaces of the samples with grain refiners tested under 15 and 60 N loads are analyzed using Scanning Electron Microscopy(SEM). The results indicate that the addition of grain refiners is beneficial to the size and distribution of the Bi-rich particles in Al-Bi alloys. Compared with Al-5Ti-B and Al-3B grain refiners, the Bi-rich particles are more uniformly distributed and spherical with finer size with the addition of Al-3Ti grain refiner. The refinement renders the Al-20wt%Bi alloy refined by Al-3Ti the superior wear resistance with respect to those refined by Al-5Ti-B and Al-3B grain refiners, corresponding to the microstructures with fine and uniformly distributed Bi-rich particles in the Al matrix. | WANG TongMin CAO Fei CHEN ZongNing KANG HuiJun ZHU Jing FU YaNan XIAO TiQiao LI TingJu | 2015 | Science China(Technological Sciences)2015，58，5： | 2 |
| 19 | Growth mechanism of primary Ti_(5)Si_(3) phases in special brasses and their effect on wear resistance显示文摘In the present work, in-situ Ti_(5)Si_(3) reinforced special brasses were prepared by melt reaction method. The synthesized Ti_(5)Si_(3) phase shows various morphologies in brasses with different Ti_(5)Si_(3) content, and the3 D morphological evolution of primary Ti_(5)Si_(3)and its growth mechanism were investigated. The Ti_(5)Si_(3) crystal, which bears D8_(8) hexagonal crystal structure, grows along <0001> direction and is revealed by{1010} faces during growth. With the increase of Ti_(5)Si_(3) content in the brasses, the morphology of primary Ti_(5)Si_(3)significantly changes from fibers to hexagonal prisms to short-rods with hollow. In addition,the influence of Ti_(5)Si_(3) volume fraction and morphology on the wear behavior of special brass was also revealed. It was substantiated that the wear resistance increases with the increasing volume fraction of Ti_(5)Si_(3), and the corresponding wear mechanism changes from delamination to slight adhesive wear and abrasive wear. However, the friction coefficient shows an abnormal increase when most of the Ti_(5)Si_(3) containing hollows appears in the brass. That is mainly due to the fact that the Ti_(5)Si_(3) is easier to break and fall off resulted by the hollow as a crack source, which makes it unable to resist the plastic deformation of the contact surface during the sliding. | Xianlong Wang Jinchuan Jie Shichao Liu Zhuangzhuang Dong Guomao Yin Tingju Li | 2021 | Journal of Materials Science & Technology2021，，2： | 2 |
| 20 | Effect of high magnetic fields on the solidification microstructure of an Al-Mn alloy显示文摘The effect of high magnetic fields on the morphology of Al-Mn phases was investigated. It is found that the tropism and the alignment of Al6Mn precipitated phases become regular under high magnetic fields. The stronger the high magnetic fields, the more regular the alignment of Al6Mn precipitated phases. Al6Mn precipitated phases can generate oriented alignment and aggregation under high magnetic fields through the observation of the quenched microstructure of the Al-Mn alloy at different temperatures. Meanwhile, the number of Al6Mn phases increases continuously along with the increasing function time of high magnetic fields. X-ray diffraction also indicates that Al6Mn phases generate obvious tropism under high magnetic fields. The process of aggregation and growth of Al6Mn precipitated phases under the function of high magnetic fields after orientation were analyzed and discussed. | LUO Dawei GUO Jin YAN Zhiming LI Tingju | 2009 | Rare Metals2009，28，3： | 2 |
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