CuNiSiAg合金热变形行为研究  

Study of Hot Deformation Behavior of CuNiSiAg Alloy

作　　者：李银华[1] 刘平[1] 贾淑果[1] 张毅[2] 田保红[1] 任凤章[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《铸造技术》2008年第6期793-797,共5页Foundry Technology

基　　金：国家863计划(2006AA03Z528);国家自然科学基金(50571035);河南省杰出青年基金(0521001200)

摘　　要：在Gleeble-1500D热模拟试验机上,采用高温等温压缩试验,对Cu-2.0Ni-0.5Si-0.15Ag合金在高温压缩变形中的流变应力行为和组织变化进行了研究。结果表明,应变速率和变形温度变化对合金的流变应力影响较大,变形温度越高,应变速率越小,合金的流变应力越低,即合金越容易发生动态再结晶;合金的显微组织随变形温度的升高先部分细化,随后细化区域扩大,最后晶粒长大并均匀化;求得Cu-2.0Ni-0.5Si-0.15Ag合金的热变形激活能Q为312.3kJ/mol,Z参数的对数和峰值应力较好地满足线性关系,建立了Cu-2.0Ni-0.5Si-0.15Ag合金的流变应力方程。The flow stress behavior and structure evolution of Cu-2.0Ni-0.5Si-0. 15Ag alloy during hot compression deformation was studied by isothermal compression test at Gleeble-1500D thermalmechanical simulator. The results show that the strain rate and deforming temperature have large effects on the flow stress. Higher the deforming temperature, less the strain rate and lower the flow stress, i.e. dynamic recrystallization can be easily happened. The microstructures becomes partially fine, then grow and become uniform. The calculated activation energy after hot deformation is 312.3 KJ/mol, In Z has a good linear relationship with peak stress, and the flow stress equation of Cu-2.0Ni-0.5Si-0.15Ag alloy is established.

关 键 词：CuNiSiAg合金 热压缩变形 动态再结晶 流变应力 

分 类 号：TG115.53[金属学及工艺—物理冶金]