Processing Maps for Controlling Microstructure of an Aircraft 2E12 Aluminum Alloy

摘要:

采用能量消耗加工图研究2E12铝合金热压缩过程中的变形行为及其微观组织演变，且建立能量消耗效率与微观组织演变的关系。压缩变形温度范围为250~500 °C，应变速率范围为0.01~10 s-1，总真应变量为0.5。结果表明，加工图中存在2个动态回复区域：(1) 325~400 °C，0.01~0.03 s-1，(2) 350~450 °C，1.78~10 s-1。当温度高于450 °C时，2E12合金发生部分动态再结晶现象，且动态再结晶体积分数随变形温度的升高而增大，但是当温度为500 °C，应变速率为1~10 s-1时，2E12合金发生了第二相粒子回溶和沿晶开裂的现象。

Abstract:

The deformation behavior and microstructure evolution in a hot compressed 2E12 alloy was investigated by constructing power dissipation map in which work efficiency can be related with microstructure evolution. Compression tests were performed in the temperature range of 250-500 °C and the strain rate ranging from 0.01 s-1 to 10 s-1 up to a true strain of 0.5. The processing maps reveal that two domains where dynamic recovery occurs comparatively: (1) 325-400 °C and 0.01-0.03 s-1, (2) 350-450 °C and 1.78-10 s-1, and partial dynamic recrystallization occurs at T≥450 °C. However, there also is evidence of redissolution of the particles and intercrystalline cracks at 500 °C and 1-10 s-1. It is shown that the volume of partial recrystallization increase with increasing of deformation temperature.