(1. 重慶理工大學(xué)材料科學(xué)與工程學(xué)院，重慶400054；
2. 重慶理工大學(xué)重慶市高校模具技術(shù)重點(diǎn)實(shí)驗(yàn)室，重慶400054)
摘 要: 利用 孿晶結(jié)構(gòu)調(diào)控鎂合金織構(gòu)和組織，可作為開辟一條低成本生產(chǎn)高性能鎂合金的路徑。探索 形變孿生新的特點(diǎn)和規(guī)律，揭示 孿生變形的物理本質(zhì)是利用 孿生變形調(diào)整鎂合金組織和性能的關(guān)鍵。對(duì)國內(nèi)外學(xué)者應(yīng)用孿生晶體學(xué)理論、分子動(dòng)力學(xué)計(jì)算機(jī)模擬和透射電鏡等研究手段探索 形變孿晶長大機(jī)制進(jìn)行綜述。重點(diǎn)對(duì) 孿晶界面精細(xì)結(jié)構(gòu)以及 孿晶長大機(jī)制(孿生位錯(cuò)剪切機(jī)制和曳步機(jī)制)進(jìn)行總結(jié)與評(píng)述。針對(duì)目前國內(nèi)外學(xué)者在 孿生機(jī)制中存在的重大爭議，有必要豐富實(shí)驗(yàn)研究及計(jì)算機(jī)模擬結(jié)果，進(jìn)一步探索 孿生長大機(jī)制，從而為利用 孿晶調(diào)控鎂合金力學(xué)性能的研究奠定理論基礎(chǔ)。
關(guān)鍵字: 鎂合金；密排六方金屬； 孿晶界；孿生
（1. School of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China;
2. Chongqing Municipal Key Laboratory of Institutions of Higher Education for Mould Technology
Chongqing University of Technology, Chongqing 400054, China）
Abstract:twining can change the texture and microstructure of Mg alloys, opening up a low-cost production of high performance magnesium alloys. The new characteristic and law are explored, and it is important to uncover the characterizations and the physical nature of twinning. The twinning mechanisms investigated by twinning crystallographic theory, atomic-computer simulation and high resolution transmission electron microscopy, were reviewed. The morphology and microstructure of twin and twinning mechanism (dislocation mechanism and shuffling mechanism) were summarized and discussed. As for the controversy between the dislocation mechanism and the shuffling mechanism, it is necessary to enrich the experimental results and atomic-computer simulation. Further exploring twinning growth mechanism is a theoretical foundation for utilizing twins to tailor the microstructure and mechanical properties of Mg alloy.
Key words: Ag alloy; hexagonal close packed metals; twinning boundary; twinning mechanism
