Texture Evolution and Dynamic Recrystallization Behavior of Hybrid-Reinforced Titanium Matrix Composites: Enhanced Stren
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show that DRXed regions and deformed regions formed during extrusion, strong h0001ia, 1010 a and weak 1011 a fiber textures parallel to extrusion direction were formed due to the selection of slip system in a phase and inheritance from phase transformation according to Burgers orientation relationship. Additionally, the orientation of a grain in DRXed regions became randomized in comparison with the deformed regions. Micro-sized TiB short fibers not only acted as source to generated dislocations, but hindered dislocation slip to cause pile-ups around TiB, which is beneficial to stimulate dynamic recrystallization. Submicro-sized La2O3 particles distributed at the triple junction of grain boundaries could pin grain boundaries and hinder grain growth. Tensile test results show that the ultimate tensile strength got a 9.8 pct enhancement, from 834.3 ± 10 to 916.0 ± 10.6 MPa, accompanied by simultaneous improvement of elongation from 5.4 ± 0.6 to 12.2 ± 0.7 pct at room temperature. The simultaneous increase of strength and ductility was principally attributed to TiB fracture modes and grain refinement after extrusion. https://doi.org/10.1007/s11661-020-05677-5 The Minerals, Metals & Materials Society and ASM International 2020
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INTRODUCTION
DISCONTINUOUS reinforced titanium matrix composites (DRTMCs), particularly fabricated by in situ technique, have received considerable attention for their potential application in aerospace, advanced weapon, ship and nuclear industry because of their low densities, high-specific modules, high-specific strength and excellent corrosion resistance as well as admiring elevated
PEIKUN QIU, GUANGFA HUANG, and JIANWEN LE are with the State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, P.R. China. YUANFEI HAN is with the State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University and also with the Zhejiang Jiatai Metal Technology Co., Ltd, Pinghu 314200, P.R. China. Contact e-mail: [email protected] LIMING LEI is with the AECC Commercial Aircraft Engine Co., Ltd, Shanghai 200241, P.R. China. LV XIAO is with the Shanghai Spaceflight Precision Machinery Institute, China Aerospace Science and Technology Corporation, Shanghai 201600, P.R. China. WEIJIE LU is with the State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University and with the Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming, Shanghai 200240, P.R. China. Contact e-mail: [email protected] Manuscript submitted August 24, 2019.
METALLURGICAL AND MATERIALS TRANSACTIONS A
temperature durability.[1–4] Among the various reinforcements in DRTMCs, TiB and TiC are the most effective ones because of their excellent thermodynamic stability and better chemical compatibility to titanium. Moreover, TiB is proved to promote creep resistance and TiC is conductive to increase the flow stress, which have synergistic effect on the mechanical properties of DRTMCs.[5,6] Additionally, rare earth elements including La, Y, Nd, Er
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