论文部分内容阅读
采用透射电子显微术研究了Ａｌ６７Ｍｎ８Ｔｉ２５金属间化合物高温拉伸变形后的显微组织．结果表明，该合金在１１７３Ｋ和８．３５×１０－５ｓ－１条件下的塑性变形过程是以动态回复为主，变形后晶粒内存在较高密度的位错、位错墙和位错网络；而在１１７３Ｋ及３．３４×１０－５ｓ－１条件下合金则发生了动态再结晶，变形后的组织为动态再结晶形成的新晶粒，晶粒内包含有稳定的亚晶界．Ａｌ６７Ｍｎ８Ｔｉ２５合金高温塑性变形是一典型的速率控制过程．由于该合金中的位错运动及与原子扩散有关的过程进行较为困难，故只有在足够高的温度和低的应变速率条件下才发生动态回复和动态再结晶，同时合金获得较高的拉伸塑性．
The microstructure of Al67Mn8Ti25 intermetallic compound after high temperature tensile deformation was studied by transmission electron microscopy. The results show that the plastic deformation process of this alloy is mainly dynamic at 1173K and 8.35 × 10-5s-1, and there are high-density dislocations, dislocation walls and dislocation networks The dynamic recrystallization occurred at 1173K and 3.34 × 10-5s-1. The deformed microstructure was a new crystal formed by dynamic recrystallization, and the grain contained a stable subgrain boundary. Al67Mn8Ti25 alloy high temperature plastic deformation is a typical rate control process. Due to the dislocation movement in the alloy and the process related to atom diffusion, it is difficult to perform dynamic recovery and dynamic recrystallization only at sufficiently high temperature and low strain rate, and the alloy has higher tensile strength Plasticity.