Cu-0.8%Mg-0.2%Fe合金热变形行为及热加工图  

Hot deformation behavior and processing maps of Cu-0.8%Mg-0.2%Fe alloy

作　　者：王冰洁 田保红[1,2] 张毅 孙慧丽[1,2] 刘勇 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]有色金属共性技术河南省协同创新中心,河南洛阳471023

出　　处：《材料热处理学报》2018年第1期145-151,共7页Transactions of Materials and Heat Treatment

基　　金：河南省科技开放合作项目(172106000058);河南省高校科技创新人才支持计划(18HASTIT024)

摘　　要：利用Gleeble-1500D数控动态-力学模拟试验机,在变形温度为500~850℃和应变速率为0.001~10 s^-1条件下对Cu-0.8%Mg-0.2%Fe合金进行等温压缩试验,测得了合金的真应力-真应变曲线。根据动态材料模型,建立了热加工图,结合合金高温变形前后的显微组织演变,对其热加工性能进行研究,并分析Fe的加入对Cu-0.8%Mg合金组织和性能的影响。结果表明：Fe可以细化晶粒,提高合金的硬度,使合金的导电率略有下降;合金的流变应力随温度的降低或应变速率的升高而增大;高温低应变速率有利于促进动态再结晶;该合金适宜的热加工参数范围为：变形温度650~825℃,应变速率0.001~0.05 s^-1。The isothermal compression test of Cu-0. 8% Mg-0.2% Fe alloy was carried out at deformation temperature of 500-850℃ and strain rate of 0. 001-10 s^-1 using a Gleeble-1500D numerical control dynamic mechanical simulator, and the true stress-true strain curves of the alloy were obtained. Based on the dynamic material model, hot processing maps of the Cu-0.8% Mg-0. 2% Fe alloy were established. The hot workability of the Cu-0. 8% Mg-0.2% Fe alloy was analyzed combining with the microstructural evolution of the alloy before and after high temperature deformation. Meanwhile, the effects of iron addition on microstructure and properties of the Cu-0.8% Mg alloy were studied. The results show that the addition of iron can refine the grains, increase the hardness of the alloy, and decrease the conductivity of the alloy slightly. The flow stress of the alloy increases with the decreasing of the temperature or the increasing of the strain rate. High temperature and low strain rate are beneficial to promote the dynamic recrystallization. The optimal processing parameters of the Cu-0. 8% Mg-0. 2% Fe alloy are as follows：the deformation temperature is 650-825℃ , and the strain rate is 0. 001- 0. 05 s^-1.

关 键 词：Cu-0 8%Mg-0 2%Fe合金 流变应力 动态再结晶 热加工图 

分 类 号：TG146.1[一般工业技术—材料科学与工程]