Cu-Al_2O_3复合材料热变形行为及加工图  

Hot deformation behavior and processing map of Cu-Al_2O_3 composite

作　　者：杨雪瑞[1] 田保红[1,2] 张毅[1,2] 刘勇[1,2] 

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]河南省有色金属材料科学与加工技术重点实验室,河南洛阳471023

出　　处：《金属热处理》2012年第12期25-28,共4页Heat Treatment of Metals

摘　　要：在Gleeble-1500D热模拟试验机上对Cu-Al2O3复合材料进行等温压缩试验,研究了变形温度600～950℃,应变速率0.001～1 s-1条件下的热变形行为。结果表明,Cu-Al2O3复合材料的流变应力-应变曲线是典型的动态再结晶类型,流变应力随应变量的增加均呈现先增大后减小,之后达到一个稳定的趋势。热变形过程中的稳态流变应力可用双曲正弦本构方程.ε=8.909×105[sinh(0.012486σ)]5.4343.exp[-133.02/(RT)]来表示。根据动态材料模型以及DMM加工图理论,建立了Cu-Al2O3复合材料的热加工图,据此确定Cu-Al2O3复合材料的最佳热变形工艺参数范围为:变形温度850～950℃,应变速率0.01～0.1 s-1。Isothermal compression test ofCu-Al2O3composite was carried out by using Gleeble-1500D thermal simulator, and hot deformation behavior of Cu-Al2O3composite was investigated under the temperature range from 600 ℃ to 950 ℃ with strain rates from 0. 001 s^-1 to 1 s^-1. The results show that the stress-strain curves of Cu-Al2O3 composite is a typical dynamic recrystallization types. With strain increasing, the flow stress first increases and then decreases, finally, reaching a stable stage. The steady flow stress of the material can be described by the hyperbolic sine constitutive equation ε = 8. 909×10^5 [ sinh （0.012486σ-） ]^ 5.4343 . exp [ - 133.02/（RT） ]. According to the dynamic material model and DMM processing map theory, hot processing map of the material is established. The optimal hot deformation parameter for the material is 850-950 ℃ with 0.01-0.1 s^-1 strain rate.

关 键 词：CU-AL2O3复合材料 热变形 本构方程 热加工图 

分 类 号：TG166.2[金属学及工艺—热处理]