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| 1 | Microstructure Design and Heat Response of Powder Metallurgy Ti_2AlNb Alloys显示文摘Pre-alloyed powder of Ti-22Al-24Nb-0.5Mo(atomic fraction,%) was prepared by gas atomization.Powder metallurgy(PM) Ti_2AlNb alloys were prepared by a hot isostatic pressing(HIPing) route.The influence of experimental variables including HIPing temperatures,solution and aging temperatures on microstructure and properties of PM Ti_2AlNb alloys was studied.The results showed that HIPing temperature affected the porosity distribution and mechanical properties of PM Ti_2AlNb alloys.The microstructure and mechanical properties of the PM Ti_2AlNb alloys changed obviously after various post heat treatments,and a good combination of tensile strength,ductility and rupture lifetime was obtained through an optimized heat treatment in the present work. | Jie Wu Lei Xu Zhengguan Lu Bin Lu Yuyou Cui Rui Yang | 2015 | Journal of Materials Science & Technology2015，31，12： | 14 |
| 2 | Effect of Hot Isostatic Pressing Loading Route on Microstructure and Mechanical Properties of Powder Metallurgy Ti_2AlNb Alloys显示文摘In this work, hot isostatic pressing(HIPing) technique was used to densify the Ti_2AlNb pre-alloyed powder.The influence of HIPing loading route parameters(temperature and rates of heating and pressurizing)on microstructure and properties of PM Ti_2AlNb alloys was studied. The results showed that HIPing loading route parameters affected the densification process and mechanical properties(especially high temperature rupture lifetime) of PM Ti_2AlNb alloys in the present work. A finite element method(FEM) model for predicting the final densification was developed and was used to optimize the HIPing procedure. | Jie wu Ruipeng Guo Lei Xu Zhengguan Lu Yuyou Cui Rui Yang | 2017 | Journal of Materials Science & Technology2017，33，2： | 10 |
| 3 | Influence of Processing Conditions on Microstructure and Mechanical Properties of Large Thin-Wall Centrifugal Ti–6Al–4V Casting显示文摘在这个工作,包括张力的静电干扰和扔的大薄墙的圆柱的 Ti-6Al-4V 的损坏忍耐性质,温度并且热均衡说的紧迫(HIPping ) 在微结构特征和机械性质上处理的模子预热的效果被学习了。试验性的结果显示出那,增加的模子预热从 673 的温度到 873K,扔的微观结构从 Widmanst 的混合物变化 ? tten 和殖民地微观结构到一个主要殖民地。厚墙节的中心比边和薄节有相对粗糙的微观结构。更低的模子预热温度引起更多的孔。HIPping 过程,它不仅有效地减少扔的毛孔而且增加优先的谷物边界结合并且变粗微观结构,对改进扔的韧性必要。由于表面上的氧污染和更好的微观结构,生气的节上的微坚硬的侧面从表面介绍一个减少的趋势给内部。为预热的不同模子的反应层的厚度温度将近一样(~ 450 畃洠捩潲 ' 跍?湩琠敨戠楬摮栠汯? 楷桴愠搠慩敭整 ? 景 ? 0? | Xin Feng Jianke Qiu Yingjie Ma Jiafeng Lei Yuyou Cui Xinhua Wu Rui Yang | 2016 | Journal of Materials Science & Technology2016，32，4： | 9 |
| 4 | Diffusion Bonding of Dissimilar Intermetallic Alloys Based on Ti_2AlNb and TiAl显示文摘Direct diffusion bonding of an orthorhombic Ti 2 AlNb base alloy to a TiAl base alloy, Ti-22Al-23Nb-2Ta and Ti-46.2Al-2Cr-2Nb-0.15B (at. pct), was carried out and the interface microstructure, formation of new phase at the interface and joint strength were characterized. At low temperature, a new phase with AlNb 2-structure, Al(Nb, Ti) 2 , was formed in the interface region adjacent to the O base alloy. The α 2 was found to be the major reaction product and developed in the interface region adjacent to the TiAl alloy as well as in the region adjacent to the O base alloy accompanying the formation of Al(Nb, Ti) 2 . The occurrence of Al(Nb, Ti) 2 has been attributed to the different diffusivity of Nb and Al, leading to a eutectoid-like reaction. At relatively high temperature, Al(Nb, Ti) 2 did not form due to enhanced diffusion of Nb but a B2-enriched zone formed on the O alloy side instead after long holding time. Only when an appropriate interface microstructure was achieved by optimizing the bonding parameters, could the shear strength of the joint reach 80% of that of the TiAl base alloy. | Jianying Zou Yuyou Cui Rui Yang | 2009 | Journal of Materials Science & Technology2009，25，6： | 3 |
| 5 | Processing Maps for Hot Working Behavior of a PM TiAl Alloy显示文摘The hot deformation behavior of a Ti-47Al-2Cr-2Nb-0.2W-0.15B(at.%) titanium aluminide alloy fabricated by pre-alloyed powder metallurgy has been investigated by using the hot compression tests in the temperature range from 950 C to 1300 C and at the strain rates between 10 3 s 1 and 10 s 1.The processing maps have been established to evaluate the optimum hot processing conditions and reveal the instability regions.It is found that the flow stress of the investigated alloy is a strong function of the temperature and the strain rate.The investigated alloy has the optimum hot-working condition at 950 C and 10 3 s 1,since the material undergoes dynamic recrystallization to produce a fine-grained microstructure.At 1250 C and 10 3 s 1,the alloy exhibits superplastic deformation.At 1300 C and 10 1 s 1,the cyclic dynamic recrystallization with high temperature grain coarsening takes place.The material undergoes flow instabilities at lower temperatures and higher strain rates,as predicted by the instability criterion.The processing maps demonstrate that the strain significantly affected the instability regions.The manifestations of the instabilities have been observed in the form of microvoids,wedge cracks,and surface fractures. | Gang Wang Lei Xu Yong Wang Zhuo Zheng Yuyou Cui Rui Yang | 2011 | Journal of Materials Science & Technology2011，27，10： | 2 |
| 6 | Compression Properties of Ti-Al-X Alloys in Relation to Site Occupancies of Alloying Elements in TiAl and Ti_3Al显示文摘 | Yulin HA O Rui YANG, Yuyou CUI and Dong LI(Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110015, China)Wanfu GAO(Fushun Petroleum Institute, Dandong Road, Fushun 113001, China) | 1999 | Journal of Materials Science & Technology1999，15，6： | 2 |
| 7 | Seeded growth of Ti-46Al-8Nb polysynthetically twinned crystals with an ultra-high elongation显示文摘Large size polysynthetically twinned crystals of Ti-46 Al-8 Nb alloy with a parallel lamellar microstructure were successfully prepared using a Ti-43 Al-3 Si seed by our new operation.A large amount of columnar B2 phase paralleling to the growth direction was found in the final lamellar microstructure.Higher growth rate(>30 mm/h)led to the failure of seeding process.Based on these results,a new mechanism is proposed to describe the seeding process of the hypo-peritectic Ti Al alloys.The peritecticαphase is suggested to directly nucleate from the melt,and then act as nucleus for transformedαphase in the subsequentβtoαtransformation.At the higher growth rate,the appearance ofβphase secondary dendrites and homogeneous nucleation lead to the failure of seeding process.High Nb addition leads to a large amount of residualβphase,and theseβdendrites finally evolve into B2 phase.The room temperature tensile elongation was measured to be 11.9-18.5%for Ti-46 Al-8 Nb PST crystals,which is the highest ever reported value for Ti Al based alloys. | Hao Jin Qing Jia Quangang Xian Ronghua Liu Yuyou Cui Dongsheng Xu Rui Yang | 2020 | Journal of Materials Science & Technology2020，54，19： | 2 |
| 8 | Tensile Behavior of SiC Fiber-Reinforcedγ-TiAl Composites Prepared by Suction Casting显示文摘The process of preparing SiC_(f)iber-reinforced y-TiAl composites by the conventional methods is difficult and complicated due to the high reactivity,high melting point and poor deformability of y-TiAl alloys.In this work,suction casting,a promising method for preparing SiC_(f)/TiAl composite,had been attempted.In the process,y-TiAl alloy melt was introduced rapidly into a mold within pre-arranged fibers that were coated with additional layer of titanium alloy.This simple method successfully prevented serious reactions between the alloy melt and the fibers which remained intact during the solidification process.The interfacial reaction layer was observed by optical microscopy,scanning electron microscopy(SEM).The interfacial reaction products were identified by transmission electron microscopy(TEM).Tensile tests of the matrix alloy and composites were performed at room temperature and 800℃.The results exhibited that the tensile strength of SiC_(f)/γ-TiAl composite was higher than that of the matrix alloy at both room temperature and 8000 C.At room temperature,tensile strength of SiC_(f)/γ-TiAl composite was increased by about 7%(50 MPa),whereas a double increase in tensile strength 14%(100 MPa)was obtained at 800℃.The titanium alloy coating on the fiber not only prevented the serious interfacial reaction between the y-TiAl alloy melt and the SiC_(f)iber,but also played a role in delaying the propagation of cracks in the matrix to the fiber at 800℃.The fracture mechanism of the composite was analyzed by fracture metallographic analysis. | Yingying Shen Qing Jia Xu Zhang Ronghua Liu Yumin Wang Yuyou Cui Rui Yang | 2021 | Acta Metallurgica Sinica(English Letters)2021，34，7： | 1 |
| 9 | Microstructure Evolution of Rapidly Solidified Ti_3Al-2Nb Alloy显示文摘It has been found from the analysis of X-ray diffraction and the observation of TEM that the metastable ordered orthorhombic martensite phase in the rapidly solidified Ti3Al-2Nb alloy transforms to various phases at different aging temperatures. When the alloy aged at temperature of 500℃ for 20 min, the phase decomposition into B2 and O phases is related to the stressin the alloy. When the aged temperature above 600℃, the phase transforms to α2 phase by both shearing and chemical | Rui XU Yuyou CUI Dong LI and Zhuangqi HU (State Key Lab. of RSA, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China)Daming XU and Qingchun LI (Dept. of Materials Science and Technology, Harbin Institute of Technology, Harb | 1996 | Journal of Materials Science & Technology1996，12，2： | 0 |
| 10 | Heterogeneous precipitate microstructure in titanium alloys for simultaneous improvement of strength and ductility显示文摘The design of alloys with simultaneous high strength and high ductility is still a difficult challenge.Here,we propose a new approach to designing multi-phase alloys with a synergistic combination of strength and ductility by engineering heterogeneous precipitate microstructures through the activation of different transformation mechanisms.Using a two-phase titanium alloy as an example,phase field simulations are carried out firstly to design heat treatment schedules that involve both conventional nucleation and growth and non-conventional pseudospinodal decomposition mechanisms,and the calculated microstructures have been evaluated by crystal plasticity finite element modeling.According to simulations,we then set a two-step heat treatment to produce bimodalα+βmicrostructure in Ti-10V-2Fe-3Al.Further mechanical testing shows that the ductility of the alloy is increased by~50%and the strength is increased by~10%as compared to its unimodal counterpart.Our work may provide a general way to improve the mechanical properties of alloys through multiscale microstructure design. | Mengyuan Hao Pei Li Xuexiong Li Tianlong Zhang Dong Wang Qiaoyan Sun Libin Liu Jinshan Li Yuyou Cui Rui Yang Dongsheng Xu | 2022 | Journal of Materials Science & Technology2022，，29： | 0 |
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