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The development of new beta titanium alloys combined high strength, large ductility and improved strain-hardening behavior due to TRIP/TWIP effects
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School of Material Science and Engineering,China University of Mining and Technology,Xuzhou,State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an,School of Material Science and Engineering,China University of Mining and Technology,Xuzhou,School of Material Science and Engineering,China University of Mining and Technology,Xuzhou,School of Material Science and Engineering,China University of Mining and Technology,Xuzhou,PSL Research University, Chimie ParisTech-CNRS, Institut de Recherche de Chimie Paris (UMR 8247), 75005 Paris, France,School of Material Science and Engineering, China University of Mining and Technology,School of Material Science and Engineering, China University of Mining and Technology

Clc Number:

TG113.12

Fund Project:

National Natural Science Foundation of China (Grant No. 51601216), the fund of the State Key Laboratory of Solidification Processing in NWPU (Grant No. SKLSP201501) and Fundamental Research Funds for the Central Universities (Grant No. 2015XKQY01)

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    Abstract:

    Titanium and its alloys have been extensively used in numerous application fields. However, both their low ductility and their lack of work-hardening when compared with steels or Co-Cr alloys, limit their use in advanced applications where superior combinations of strength and ductility are required. Therefore, inspired from the superior mechanical properties of TRIP/TWIP steels (TRIP for Transformation Induced Plasticity and TWIP for Twinning Induced Plasticity), we proposed a new type of metastable β Ti-alloys showing combined TRIP/TWIP effects through controlling the β stability of Ti-alloys. The alloys were designed based on the “d-electron alloy design method” and controlling of electron/atom ratio (e/a). The results show that so-designed alloys display excellent combination of high strength (ultimate tensile strength ≈1020MPa), high ductility (uniform elongation 43%) and improved work-hardening behavior. The detailed microstructural analysis indicates that the superior performances arise from the synergic effects between α? phase transformation induced plasticity (TRIP) and {332}<113> twinning induced plasticity (TWIP).

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[Zhang Jinyong.,Li Jinshan, Chen Zheng, Meng Qingkun, Zhang Ping, Sun Fan, Shen ChengJin, Shen Baolong. The development of new beta titanium alloys combined high strength, large ductility and improved strain-hardening behavior due to TRIP/TWIP effects[J]. Rare Metal Materials and Engineering,2018,47(9):2787~2792.]
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History
  • Received:November 16,2016
  • Revised:March 14,2017
  • Adopted:April 13,2017
  • Online: November 01,2018

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