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Study on stain-hardening behaviour of a ductile beta Ti-alloy with transformation-induced plasticity and twinning-induced plasticity
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Affiliation:

School of Material Science and Engineering,China University of Mining and Technology,Xuzhou

Clc Number:

TG113.12

Fund Project:

Fundamental Research Funds for the Central Universities (Grant No.: 2015QNA08)

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    Abstract:

    In this work, we investigate the strain hardening behavior of the metastable β Ti-12Mo-5Zr (wt. %) alloy combined with TWIP/TRIP effects (TRIP for Transformation Induced Plasticity and TWIP for Twinning Induced Plasticity). The evolution of the strain hardening exponent is analyzed by classical Hollomon theory. The three stages of strain-hardening behavior are divided, labeled as Stage ?, Stage ?? and Stage ???, respectively. Stage I corresponds to the transition from the elastic to plastic regimes (ε≈0~0.02). Stage II relates to a continuously increase of the strain-hardening rate and the hardening exponent (ε≈0.02~0.15). Then, the strain-hardening rate decreases and the hardening exponent reaches stable value 0.34 in Stage III (ε≈0.15~0.34). The evolution of microstructure within three stages is observed by employing techniques of optical microscopy (OM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). Based on the experimental results, the governing mechanisms for deformation at different stages and strain-hardening behavior of Ti-12Mo-5Zr alloy are discussed.

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[Chen Guanfang, Zhang Jinyong, Zhang shuai, Fu Yangyang, Chen Zheng, Meng Qingkun, Zhang Ping, Shen Chengjin, Shen Baolong. Study on stain-hardening behaviour of a ductile beta Ti-alloy with transformation-induced plasticity and twinning-induced plasticity[J]. Rare Metal Materials and Engineering,2020,49(1):297~303.]
DOI:10.12442/j. issn.1002-185X.20181118

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History
  • Received:November 07,2018
  • Revised:January 10,2019
  • Adopted:February 21,2019
  • Online: February 16,2020
  • Published: