(1. 燕山大學(xué) 材料科學(xué)與化學(xué)工程學(xué)院, 066004 秦皇島;
2. Materials Research Department, Risoe National Laboratory, Denmark)
摘 要: 采用TEM研究了多晶銅形變及再結(jié)晶的顯微組織特征。結(jié)果發(fā)現(xiàn)：多晶銅的形變顯微組織表現(xiàn)為3種不同類型，形變顯微組織與晶粒的晶體學(xué)取向存在明顯的依賴關(guān)系；在對不同形變顯微組織中位錯邊界兩側(cè)亞晶的取向差及位錯邊界間距進(jìn)行定量分析的基礎(chǔ)上，估算了每一類型組織的位錯密度及其儲存能，發(fā)現(xiàn)不同類型組織間存在明顯的差別；對形變后的試樣進(jìn)行再結(jié)晶退火后發(fā)現(xiàn)，再結(jié)晶形核機(jī)制為晶界弓出形核，晶界弓出方向為儲存能較高的晶粒。
關(guān)鍵字: 晶粒取向； 形變顯微組織； 位錯密度；再結(jié)晶
of tensile strained copper
（1. College of Materials Science and Chemical Engineering, Yanshan University, Qinhuangdao 066004, P.R.China;
2. Materials Research Department, Risoe National Laboratory, Denmark）
Abstract:For polycrystalline copper tensile deformation to a moderate strain, the microstructure after deformation and after annealing to the start of recrystallization has been studied by transmission electron microscopy. It is found that different types of deformation microstructures develop depending on the grain orientation. Quantitative measurement of misorientation and spacing of dislocation boundaries induced during deformation has allowed an estimate of the dislocation density and the stored energy for each types of structures. Upon annealing of the deformed samples, nucleation takes place at the original grain boundaries and the nuclei grow into the local region with the highest stored energy.
Key words: grain orientation; deformation microstructure; dislocation density; recrystallization
