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動(dòng)態(tài)壓縮條件下高純鈦微觀組織特征研究
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重慶大學(xué),重慶大學(xué),重慶大學(xué),重慶理工大學(xué),重慶大學(xué)

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國家自然科學(xué)基金資助(51271208)


Study of Microstructural Characteristics of High-purity Titanium during Dynamic Compression
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Chongqing University,Chongqing University,Chongqing University,Chongqing University of Technology,Chongqing University

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    摘要:

    利用光學(xué)顯微鏡(OM)、背散射電子衍射(EBSD)技術(shù)及透射電子顯微鏡(TEM)對高純鈦低-中應(yīng)變動(dòng)態(tài)壓縮變形的微觀組織特征進(jìn)行了研究。結(jié)果表明：隨著應(yīng)變量(ε)的增加,晶粒內(nèi)部通過孿晶與孿晶,孿晶與位錯(cuò)以及位錯(cuò)與位錯(cuò)之間的交互作用逐步細(xì)化原始晶粒；變形初期,形變孿生以{11-22}孿晶為主,當(dāng)ε達(dá)到0.2后,{10-12}孿晶轉(zhuǎn)變?yōu)橹饕巫儗\生類型,孿生改變了原始晶粒的取向,進(jìn)一步促進(jìn)晶粒內(nèi)部的位錯(cuò)滑移。高純鈦動(dòng)態(tài)壓縮變形經(jīng)歷了由位錯(cuò)滑移到形變孿生,再到位錯(cuò)滑移主導(dǎo)的過程,但位錯(cuò)滑移和孿生始終共同作用協(xié)調(diào)動(dòng)態(tài)壓縮變形。

    Abstract:

    Microstructural characteristics of high-purity titanium during dynamic compression at low-medium strain were studied by optical microscopy (OM), electrical back-scattered diffraction (EBSD) techniques and transmission electron microscopy (TEM). The results show that the original grains are gradually refined by twin-twin, twin-dislocation and dislocation-dislocation interactions. The predomiant twinning system is {11-22} twinning at the beginning of deformation, {10-12} twinning become to the main twinning modes when strain reached 0.2. The orientations of each twinned grain are altered by twinning that further facilitate dislocation glide in interior grains. Though dislocation slip and twinning always work together to coordinate macroscopic plastic deformation, the deformation process of high-purity titanium during dynamic compression is experienced dislocation slip to deformation twinning and dislocation slip again.

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任 毅,張喜燕,孫 奇,涂 堅(jiān),劉 慶.動(dòng)態(tài)壓縮條件下高純鈦微觀組織特征研究[J].稀有金屬材料與工程,2017,46(7):1850~1855.[Ren Yi, Zhang Xiyan, Sun Qi, Tu Jian, Liu Qing. Study of Microstructural Characteristics of High-purity Titanium during Dynamic Compression[J]. Rare Metal Materials and Engineering,2017,46(7):1850~1855.]
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  • 收稿日期:2015-03-26
  • 最后修改日期:2015-07-28
  • 錄用日期:2015-09-07
  • 在線發(fā)布日期: 2017-11-14
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