(1. 燕山大學(xué) 材料科學(xué)與工程學(xué)院， 秦皇島 066004；
2. 清華大學(xué) 材料系， 北京 100084)
摘 要: 利用TEM分析拉伸變形多晶銅中不同取向晶粒的位錯(cuò)組織，研究了多晶與單晶形變行為的相關(guān)性。結(jié)果發(fā)現(xiàn)，多晶銅中諸晶粒的形變顯微組織可分為3種不同類型，而且組織類型與其相應(yīng)晶粒的晶體學(xué)取向存在密切的相關(guān)性；根據(jù)多晶中不同類型組織的體積含量，結(jié)合相應(yīng)取向單晶的應(yīng)力-應(yīng)變曲線，計(jì)算出了多晶的應(yīng)力-應(yīng)變曲線，其結(jié)果與實(shí)測(cè)曲線相似。
關(guān)鍵字: 位錯(cuò)組織； 晶粒取向； 應(yīng)力-應(yīng)變曲線
between polycrystalline and single crystal copper
（1. College of Materials Science & Engineering,
Yanshan University, Qinghuadao 066004, P.R.China;
2. Department of Materials Science & Engineering,
Tsinghua University, Beijing 100084, P.R.China）
Abstract:The dislocation microstructure was analyzed by TEM for grains of different orientations in polycrystalline copper during tensile deformation, and also the correlation of plastic deformation behavior between polycrystalline and single crystal copper was studied. The results show that three types of microstructure have been identified in polycrystalline copper after deformation. Meanwhile, an obvious correlation is found between microstructure and grain orientation. The stress-strain curve of the polycrystal is calculated with fair accuracy from single crystal data, which are weighted according to the volume fraction of the three different types of microstructure, and a good match with the experimental curve has been obtained.
Key words: dislocation microstructure; grain orientation; stress-strain curve
