(1. 江蘇省(沙鋼)鋼鐵研究院，張家港 215625；
2. 重慶大學(xué) 材料科學(xué)與工程學(xué)院，重慶 400044)
摘 要: 對(duì)純鈦圓柱樣品進(jìn)行準(zhǔn)靜態(tài)壓縮試驗(yàn)，研究純鈦在準(zhǔn)靜態(tài)條件下的微觀結(jié)構(gòu)和織構(gòu)演變及其變形機(jī)制。結(jié)果發(fā)現(xiàn)：準(zhǔn)靜態(tài)壓縮純鈦中均形成了{(lán)1012 }、{1121 }和{1122 } 3 種類型形變孿晶，微觀結(jié)構(gòu)演變經(jīng)歷了形變孿晶細(xì)化晶粒、孿晶達(dá)到飽和和晶粒破碎細(xì)化階段。織構(gòu)演變也經(jīng)歷了初始雙峰織構(gòu)轉(zhuǎn)變?yōu)閳A環(huán)狀分布、圓環(huán)狀分布轉(zhuǎn)變?yōu)榛婵棙?gòu)和基面織構(gòu)增強(qiáng)3 個(gè)階段。微觀結(jié)構(gòu)和織構(gòu)演變分析表明，準(zhǔn)靜態(tài)壓縮純鈦的變形機(jī)制是：低應(yīng)變階段(ε≤0.3)以形變孿生為主，孿生飽和后(ε＞0.3)轉(zhuǎn)變?yōu)橐晕诲e(cuò)滑移為主，其孿生飽和臨界應(yīng)變?yōu)?.3。
關(guān)鍵字: 純鈦；準(zhǔn)靜態(tài)壓縮；微觀結(jié)構(gòu)；織構(gòu)
（1. Institute of Iron and Steel,Jiangsu Province Sha-steel Co.,Ltd.,Zhangjiagang 215625,China;
2. School of Materials Science and Engineering,Chongqing University,Chongqing 400044,China）
Abstract:The cylindrical pure Ti specimens were subjected to quasi-static compression (QSC). The microstructure and texture evolution and its deformation mechanism of QSC pure Ti were investigated. The results show that there are three types of deformation twins ({1012 },{1121 } and {1122 } twinning) in all samples. The microstructure evolution can be divided into some stages,including deformation twin refining grains,twins reaching saturation and grain refining. The texture evolution also experiences the following stages: the initial bimodal texture transforms to ring-like distribution at lower strain levels,and then the ring-like distribution transforms to basal texture and gradually increases at higher strains. According to the analysis of microstructure and texture evolution,it is shown that deformation twinning is dominant at lower strain levels (ε≤0.3),however,dislocation slip plays a major role when strain exceeds 0.3. The critical strain of deformation twinning reaching saturation in QSC pure Ti is 0.3.
Key words: pure titanium; quasi-static compression; microstructure; texture
