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真空除气热压是铝合金粉末固结的重要工序,较高的温度和较长的时间有利于改善除气和致密化效果,但是,快速凝固(RS)铝锂合金在高温和长时间处理时,粉末的亚稳组织可能变化。本文研究了RS Al-2.3Li-1.8Cu-1Mg-0.3Zr合金的不同真空除气热压工艺对微观组织及最终制品力学性能的影响。结果表明:在400℃以上除气热压时,随着温度进一步升高,RS铝锂合金压坯中第二相粒子逐渐粗化并聚集在粉末颗粒边界上,在450℃以上,部分粉末颗粒边界消失;将温度控制在350℃作真空除气热压,可以获得均匀微细的微观组织,明显改善合金制品的强度和塑性,该制品的时效强化速度明显加快。
Vacuum degassing hot pressing is an important process of aluminum alloy powder consolidation. Higher temperature and longer time will help to improve degassing and densification. However, the rapid solidification (RS) Al-Li alloy is treated at high temperature and for a long time The metastable structure of the powder may change. In this paper, the effects of different vacuum degassing and hot pressing processes on the mechanical properties of the microstructures and final products of RS Al-2.3Li-1.8Cu-1Mg-0.3Zr alloy were studied. The results show that when the temperature is higher than 400 ℃, the second phase particles in the RS aluminum-lithium alloy green compact gradually coalesce and gather on the boundary of the powder particles. When the temperature is above 450 ℃, some of the powder particles The boundary disappears; the temperature is controlled at 350 ℃ for vacuum degassing hot pressing, you can get uniform and fine microstructure, significantly improve the strength and plasticity of the alloy products, the aging accelerated significantly accelerated.