Understanding the Role of Multi-scale Reinforcements on Severe Plastic Deformation of Titanium Matrix Composites
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TITANIUM matrix composites (TMCs) are regarded as one of the most promising materials for aerospace applications due to their excellent specific strength, high specific modulus, low density, heat and wear resistance, etc.[1,2] TiB whiskers (TiBw) are one of the most suitable reinforcements for TMCs because of their thermal stability, high elastic modulus, as well as similar density and Poisson’s ratio close to Ti matrix.[3,4] Rare earth elements, such as lanthanum, can reduce oxygen
JIANWEN LE, JUAN XIANG, GUANGFA HUANG, are with the State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. YUANFEI HAN is with the State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, and also with the Zhejiang Jiatai Metal Technology Co., Ltd, Pinghu 314200 China. Contact e-mail: [email protected] LIMING LEI is with the AECC Commercial Aircraft Engine Co., Ltd, Shanghai 200241, China. WEIJIE LU is with the State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University and also with the Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming, Shanghai 200240, China. Contact e-mail: [email protected] Manuscript submitted September 11, 2019 Article published online January 21, 2020 1732—VOLUME 51A, APRIL 2020
content and increase the thermal stability of TMCs.4] Besides, lanthanum oxide particle (La2O3p) is also propitious to the increase of mechanical properties of TMCs as reinforcements.[5] Hot working is a necessary step to reduce microdefects and refine grains in TMCs, which can effectively enhance the mechanical properties. However, traditional hot-working techniques such as forging,[6] extrusion,[7] and rolling[2] are difficult to obtain bulk ultrafine-grained (UFG) materials by introducing large deformation without changing the geometric dimension. Equal channel angular pressing (ECAP) is one of the most potential severe plastic deformation (SPD) methods, which can be used to produce UFG structure and improve mechanical properties effectively. Most investigations on ECAP have concentrated on pure metals and metallic alloys with good ductility,[8] such as aluminum, copper, nickel, carbon steel,[9] pure titanium,[10–13] etc. Some available reports on application of ECAP to metal matrix composites mainly focus on aluminum matrix composites[14,15] and copper matrix composites.[16] The intrinsic poor formability of titanium alloys and the addition of ceramic reinforcements make the ECAP process of TMCs more challenging than the above materials, resulting in fewer reports on the ECAP of TMCs.[17–20] Some limited reports reveal that ECAP process significantly affected microstructure
METALLURGICAL AND MATERIALS TRANSACTIONS A
and mechanical properties of TMCs. Han et al.[17] studied the influences of pass numbers on microstructure and properties of ECAPed (TiB + TiC)/Ti6
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