Cu-Ni-Si-Co-Zr合金的热压缩行为

Hot compression behavior of Cu-Ni-Si-Co-Zr alloy

利用Gleeble-1500数控动态力学模拟试验机,对Cu-1.56Ni-0.65Si-1.12Co-0.05Zr合金进行热压缩试验,应变速率0.002~10 s^(-1),变形温度为600~900℃,总变形量为50%。结果表明:在热压缩过程中,Cu-1.56Ni-0.65Si-1.12Co-0.05Zr合金的流变应力随着变形温度的降低和应变速率的增加而升高,应力在达到峰值之后不再发生明显变化,高温、低应变速率的变形条件更有利于合金的动态再结晶。显微组织观察表明合金的动态再结晶机制为连续动态再结晶和不连续动态再结晶共同作用,析出相主要钉扎在位错和晶界处,能够阻碍位错的运动从而增强基体。

The hot compression tests of Cu-1.56Ni-0.65Si-1.12Co-0.05Zr alloy were carried out by a Gleeble-1500 numerical control dynamic-mechanical simulation testing machine under the condition of strain rate of 0.002-10 s^(-1),deformation temperature of 600-900℃ and the total deformation of 50%.The results show that during hot compression,the flow stress of the Cu-1.56Ni-0.65Si-1.12Co-0.05Zr alloy increases with the decrease of deformation temperature and the increase of strain rate,and the stress does not change significantly after reaching the peak value.The deformation conditions of high temperature and low strain rate are more conducive to the dynamic recrystallization of the alloy.The microstructure observation shows that the dynamic recrystallization mechanism of the alloy is a combination of continuous dynamic recrystallization and discontinuous dynamic recrystallization,and the precipitates are mainly pinned at the dislocations and grain boundaries,which can hinder the movement of dislocations and strengthen the matrix.