摘要
针对挤压态和热处理态挤压变形Mg-4%Zn-0.5%Zr-xCe合金的显微组织和拉伸性能进行了研究,以确定稀土元素Ce和T5处理对该类合金性能的影响规律.结果表明,加入稀土元素Ce可以有效地细化挤压变形Mg-4%Zn-0.5%Zr合金的组织,提高其室温抗拉强度、屈服强度和断裂伸长率.经过T5处理后,Mg-4%Zn-0.5%Zr-xCe合金的抗拉强度和屈服强度可以得到显著提高,其中Ce质量分数为1%的合金具有最优的综合拉伸性能.断口形貌观察结果表明,不同处理状态的挤压变形Mg-4%Zn-0.5%Zr-xCe合金在拉伸加载条件下主要呈现脆性和韧性混合断裂.
In order to determine the influence of rare element Ce and T5 treatment on the tensile properties of extruded Mg-4% Zn-0. 5% Zr-xCe alloys, the microstructures and tensile properties of the alloys with both as-extruded and heat treated states were investigated. The results show that the addition of rare earth element Ce can not only effectively refine the grains of extruded Mg-4% Zn-O. 5% Zr alloy, but also improve the ultimate tensile strength, yield strength and elongation to failure of the alloy at room temperature. After the T5 treatment, the ultimate tensile and yield strengths of Mg-4% Zn-0. 5% Zr-xCe alloys get obviously enhanced, and the Mg-4% Zn-0. 5% Zr-1.0%Ce alloy exhibits the optimal comprehensive tensile properties. The observation on the morphologies of fracture surfaces reveals that under the tensile loading condition, the extruded Mg-4% Zn-0. 5% Zr-xCe alloys with different treated states mainly exhibit the mixed brittle and ductile fracture.
出处
《沈阳工业大学学报》
EI
CAS
北大核心
2013年第5期498-503,共6页
Journal of Shenyang University of Technology
基金
辽宁省高等学校优秀人才支持计划资助项目(LR201030)
关键词
镁合金
稀土元素CE
热挤压
T5处理
显微组织
抗拉强度
屈服强度
断裂伸长率
magnesium alloy
rare earth element Ce
hot extrusion
T5 treatment
microstructure
ultimatetensile strength
yield strength
elongation to failure
