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挤压变形Mg-4%Zn-0.5%Zr-xCe合金的显微组织与拉伸性能
引用本文:陈立佳,徐海健,车欣. 挤压变形Mg-4%Zn-0.5%Zr-xCe合金的显微组织与拉伸性能[J]. 沈阳工业大学学报, 2013, 35(5): 498-503. DOI: 10.7688/j.issn.1000-1646.2013.05.04
作者姓名:陈立佳  徐海健  车欣
作者单位:沈阳工业大学 材料科学与工程学院, 沈阳 110870
基金项目:辽宁省高等学校优秀人才支持计划资助项目(LR201030)
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.

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  

Microstructures and tensile properties of extruded Mg-4%Zn-0.5%Zr-xCe alloys
CHEN Li-jia;XU Hai-jian;CHE Xin. Microstructures and tensile properties of extruded Mg-4%Zn-0.5%Zr-xCe alloys[J]. Journal of Shenyang University of Technology, 2013, 35(5): 498-503. DOI: 10.7688/j.issn.1000-1646.2013.05.04
Authors:CHEN Li-jia  XU Hai-jian  CHE Xin
Affiliation:School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
Abstract: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-0.5%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.
Keywords:magnesium alloy  rare earth element Ce  hot extrusion  T5 treatment  microstructure  ultimate tensile strength  yield strength  elongation to failure  
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