Al-Zn-Cu系合金不连续析出组织变形后的结构与性能  

Structure and Property of Al-Zn-Cu Alloy with Discontinuous Precipitation

作　　者：任玉平[1] 丁桦[1] 郝士明[1] 

机构地区：[1]东北大学,辽宁沈阳110004

出　　处：《稀有金属材料与工程》2005年第5期721-725,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(59971015)

摘　　要：采用扫描电镜、透射电镜、X射线衍射及硬度测试等手段研究了添加2at%Cu的AlZn对称成分合金在冷轧后重新加热过程中的组织结构变化。结果发现:该合金不连续析出组织在冷变形后重新加热时发生了再结晶,以连续粗化与不连续粗化2种机制进行,再结晶温度约为100℃;而且相组成物由Al相、Zn相和细小的ε相转变为Al相、Zn相和粗大的T′相。AlZn-2Cu合金不连续析出组织在冷变形后重新加热时,硬度的变化是由再结晶软化、T′相粗化以及Zn原子的固溶强化共同影响的结果。Microstructure and structure evolutions during the reheating process in a symmetrical composition AlZn alloy containing 2at%Cu after cold rolling were investigated by SEM, TEM, X-ray diffraction analysis, and hardness test. It is found that recrystallization appeare when reheating the cold deformed discontinuous precipitation of the alloy, and there are two types of recrystallization: continuous coarsening and discontinuous coarsening. Recrystallization temperature is about 100 degrees C. Also, the phase constituents of discontinuous precipitation are transformed form the Al-rich phase, Zn-rich phase and epsilon fine phase to the Al-rich phase, Zn-rich phase and coarse T' phase. The hardness changes during the reheating of cold deformed discontinuous precipitation of the AlZn-2Cu alloy are due to the combined effects of recrystallization softening, coarsening of T' phase and solution strengthening of the atom Zn.

关 键 词：AlZn-2Cu合金 再结晶 不连续粗化 连续粗化 固溶强化 

分 类 号：TG113[金属学及工艺—物理冶金]