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相變/孿晶誘發(fā)塑性的鈦合金加工硬化行為研究
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中國礦業(yè)大學材料科學與工程學院

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中圖分類號:

TG113.12

基金項目:

中央高?；究蒲袠I(yè)務費專項資金資助(項目號：2015QNA08),


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

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

Fund Project:

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

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    摘要:

    本文研究了具有TWIP/TRIP效應的Ti-12Mo-5Zr鈦合金的加工硬化行為（TRIP：相變誘發(fā)的塑性變形，TWIP：孿晶誘發(fā)的塑性變形），并利用Hollomon理論分析了該合金的加工硬化指數(shù)n變化趨勢。根據(jù)加工硬化率的演變趨勢，該合金的加工硬化過程可分為三個不同階段：Stage I（ε≈0~0.02），彈-塑性變形過渡階段；Stage II（ε≈0.02~0.15），加工硬化率θ和硬化指數(shù)n逐漸增大階段；Stage III（ε≈0.15~0.34），加工硬化率θ逐漸減小直到頸縮階段，該階段硬化指數(shù)n達到穩(wěn)定值0.34。結(jié)合光鏡（OM）、透射電鏡（TEM）等手段詳細研究了該合金在這三個不同加工硬化階段的顯微結(jié)構(gòu)演化過程，探討了每個階段的變形機理及其硬化行為。

    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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陳冠方,張金勇,張帥,付洋洋,陳正,孟慶坤,張平,沈承金,沈?qū)汖?相變/孿晶誘發(fā)塑性的鈦合金加工硬化行為研究[J].稀有金屬材料與工程,2020,49(1):297~303.[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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  • 收稿日期:2018-11-07
  • 最后修改日期:2019-01-10
  • 錄用日期:2019-02-21
  • 在線發(fā)布日期: 2020-02-16
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