预变形对Mg-Gd-Ag-Zr合金时效硬化行为与力学性能的影响  

Effect of Pre-deformation on Aging Hardening and Mechanical Property of Mg-Gd-Ag-Zr Alloy

作　　者：李玲[1,2] 辛仁龙[2] 

机构地区：[1]广东石油化工学院机电工程学院,茂名525000 [2]重庆大学材料科学与工程学院,重庆400030

出　　处：《材料导报（纳米与新材料专辑）》2014年第2期436-438,共3页

基　　金：国家重点基础研究发展计划(973)(2007CB613703)

摘　　要：研究了6%和10%的预变形对挤压态Mg-Gd-Ag-Zr合金在200℃时效的析出行为与力学性能的影响。结果表明,挤压态和预变形量为6%的Mg-Gd-Ag-Zr合金在200℃时效48h达到峰时效,而10%的预变形能大大促进合金的时效硬化反应速率,合金在28h即可达到峰时效。与挤压态的Mg-Gd-Ag-Zr合金相比,预变形提高了合金在200℃时效4h的屈服强度和抗拉强度,也提高了合金在200℃峰时效的屈服强度和伸长率。预变形过程中产生的孪晶和时效过程中第二相的析出共同影响着预变形合金在200℃时效的硬化行为和力学性能。The effect of 6% pre-deformed and 10% pre-deformed on the aging characteristics and mechanical properties of extruded Mg-Gd-Ag-Zr alloy was investigated. It is found that the extruded and 6% pre-deformed Mg- Gd-Ag-Zr alloy reach aging peak at 48 h, while the age-hardening response of 10G pre-deformed Mg-Gd-Ag-Zr alloy is remarkably accelerated, it reaches aging peak at 28 h. Compared to the extruded sample, the yield strength and ten sile strength of pre-deformed one aged at 200 ~C for 4 h were enhanced, and the yield strength and tensile elongation of the peak aged pre-deformed sample at 200℃ were also improved. The aging hardening and tensile properties of predeformed Mg-Gd-Ag-Zr alloy are influenced by the twins introduced by pre-deformation and the second phase precipitating during aging.

关 键 词：Mg—Gd-Ag—Zr合金 预变形 时效硬化 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]