Influence of pre-deformation on age-hardening response and mechanical properties of extruded Mg-6%Zn-1%Mn alloy  

预变形对挤压态Mg-6%Zn-1%Mn镁合金时效硬化效应和力学性能的影响(英文)

作　　者：石国梁[1] 张丁非[2,3] 张红菊[2] 赵霞兵[4] 齐福刚[2] 张奎[1] 

机构地区：[1]北京有色金属研究总院有色金属材料制备加工国家重点实验室,北京100088 [2]重庆大学材料科学与工程学院,重庆400045 [3]重庆大学国家镁合金材料工程技术研究中心,重庆400045 [4]北京科锐配电自动化股份有限公司,北京100085

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第3期586-592,共7页中国有色金属学报（英文版）

基　　金：Project(2007CB613700) supported by the National Basic Research Program of China;Project(50725413) supported by the National Natural Science Foundation of China;Project(CDJXS11132228) supported by the Fundamental Research Funds for the Central Universities,China;Projects(2010DFR50010,2008DFR50040) supported by International Cooperation Program,China;Projects (CSTC2009AB4008,2010CSTC-HDLS) supported by Chongqing Sci & Tech Program,China

摘　　要：The effect of cold plastic deformation between solution treatment and artificial aging on the age-hardening response and mechanical properties of alloy was investigated by micro-hardness test,tensile test,optical microscopy（OM） and TEM observation.After solution treatment at 420 ℃ for 1 h,three kinds of pre-deformation strains,i.e.0,5% and 10%,were applied to extruded ZM61 bars.Age-hardening curves show that pre-deformation can significantly accelerate the precipitation kinetics and increase peak-hardness value;however,as pre-deformation strain rises from 5% to 10%,there is no gain in peak hardness value.The room temperature（RT） tensile properties demonstrate that increasing the pre-deformation degree can enhance the yield strength（YS） and ultimate tensile strength（UTS） but moderately reduce elongation（EL）;furthermore,the enhancement of YS is larger than that of UTS.No twin can be observed in 5% pre-deformed microstructure;however,a large number of twins are activated after 10% pre-deformation.The peak-aged TEM microstructure shows that pre-deformation can increase the number density of rod-shaped β 1 ＇ precipitates which play a key role in strengthening ZM61 alloy.采用显微硬度测试、拉伸试验、金相观察和TEM观察,研究冷塑性变形对Mg-6%Zn-1%Mn(ZM61)合金时效硬化和力学性能的影响。在420℃固溶处理1h后,对ZM61挤压棒材试样进行室温拉伸变形,塑性应变有3种:0、5%和10%,预变形后再进行人工时效。时效硬化曲线表明:预变形可以显著加快硬化速率且提高峰值硬度;然而,当应变量由5%增加到10%后,峰值硬度并未增加。室温拉伸性能表明:预变形量增加,屈服强度和抗拉强度增加,伸长率略有降低,且屈服强度的增加幅度大于抗拉强度的。金相组织观察表明:当预变形应变量为5%时,金相组织中未观察到孪晶;预变形10%的组织中出现了大量的孪晶。TEM观察表明:预变形可以增加峰时效态组织中β1′杆状相的数量。

关 键 词：Mg-6%Zn-1%Mn（ZM61） PRE-DEFORMATION age-hardening response mechanical properties 

分 类 号：TG146.21[一般工业技术—材料科学与工程]