(東北大學 材料與冶金學院，沈陽 110004)
摘 要: 采用光學顯微鏡、掃描電鏡和透射電鏡研究了Al-40%Zn(摩爾分數(shù))二元合金的不連續(xù)析出細片層組織在冷軋后重新加熱時所發(fā)生的再結(jié)晶。根據(jù)加熱過程中的顯微組織變化，確定了該合金再結(jié)晶的形核及長大機制。結(jié)果發(fā)現(xiàn)，再結(jié)晶的2種機制為非典型形核長大機制的連續(xù)粗化和典型形核長大機制的不連續(xù)粗化，后者又分為在團域界面、 滑移帶等處發(fā)生的以變形儲能為主要驅(qū)動力的粗化和在變形量很小區(qū)域發(fā)生的以界面能為主要驅(qū)動力的粗化。
關鍵字: Al-Zn合金；不連續(xù)析出；再結(jié)晶
discontinuous precipitation microstructure
in symmetrical Al-Zn alloy
WANG Da-peng, ZHAO Gang
（School of Materials and Metallurgy, Northeastern University,
Shenyang 110004, China）
Abstract:Recrystallization of cold rolled discontinuous precipitation microstructure which has fine lamellar structure in a Al-40%Zn (mole fraction) binary alloy was investigated by optical microscopy, SEM and TEM. According to the microstructural evolution during the heating process, the nucleation and growth of recrystallization of this alloy was determined. It is found that there are two types of recrystallization: continuous coarsening (CC) which is non-typical nucleation and growth mechanism and discontinuous coarsening (DC) which is typical nucleation and growth one. The latter can be divided into coarsening mainly driven by deformation stored energy at colony boundaries and slip bands and the one mainly driven by boundary energy in the area without much deformation.
Key words: Al-Zn alloy；discontinuous precipitation；recrystallization
