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研究了粉末冶金制备的固溶态Cu-15Ni-8Sn合金在不同温度和压缩速率下的动态时效行为。结果表明:在较低温度和较慢的应变速率下变形时,溶质原子首先向位错处偏聚,形成对位错移动产生钉扎作用的Cottrell气团,产生动态应变时效,随后位错处弥散分布的溶质原子形成细小的调幅组织。而在较高温度变形时效时,溶质原子很快形成析出强化相,不产生动态应变时效,且达到峰时效的时间远小于预冷变形后的峰时效时间。
The dynamic aging behavior of solid solution Cu-15Ni-8Sn alloy prepared by powder metallurgy at different temperatures and compression rates was studied. The results show that the solute atoms are firstly dislocated to the dislocations to form Cottrell air masses that pinch the dislocation movement and degenerate at a lower temperature and a slower strain rate, followed by dynamic strain aging, followed by the diffusive distribution of dislocations Solute atoms form small amplitude modulated tissue. However, when aging at higher temperature, the solute atoms quickly form precipitated phases without dynamic strain aging, and the peak aging time is far less than the peak aging time after pre-cooling deformation.