论文部分内容阅读
采用形变热处理工艺对Al-1.98Li-1.90Cu-1.27Mg-0.18Zr合金的再结晶进行了研究。结果表明,再结晶前存在的第二相粒子的大小、分布对再结晶影响很大。时效温度越高,析出粒子直径越大,密度越低,再结晶程度就越高,晶粒也就越小,但再结晶晶粒大小不均。这与再结晶形核机制有关。电子探针分析表明,粗大的第二相粒子主要是富铜的θ或T_1相和富Cu,Mg的S相粒子。
The recrystallization of Al-1.98Li-1.90Cu-1.27Mg-0.18Zr alloy was studied by using the deformation heat treatment process. The results show that the size and distribution of the second phase particles before recrystallization have a great influence on the recrystallization. The higher the aging temperature, the larger the precipitated particle diameter, the lower the density, the higher the degree of recrystallization, the smaller the grains, but the less recrystallized grains. This is related to the recrystallization nucleation mechanism. Electron probe analysis showed that the coarse second phase particles are mainly copper-rich θ or T_1 phase and S phase particles rich in Cu and Mg.