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材料工程  2012, Vol. 0 Issue (12): 39-44    
  工艺 本期目录 | 过刊浏览 | 高级检索 |
热处理对GWZ661变形镁合金组织与性能的影响
甄睿1,2, 孙扬善2, 王章忠1, 方信贤1, 石卫1
1. 南京工程学院 材料工程学院,南京 211167;
2. 东南大学 材料科学与 工程学院 江苏省先进金属材料高技术研究重点实验室,南京 211189
Effect of Heat Treatment on Microstructures and Mechanical Properties of Extruded GWZ661 Alloy
ZHEN Rui1,2, SUN Yang-shan2, WANG Zhang-zhong1, FANG Xin-xian1, SHI Wei1
1. Department of Materials Science and Engineering,Nanjing Institute of Technology, Nanjing 211167,China;
2. Jiangsu Key Lab of Advanced Metallic Materials,School of Materials Engineering,Southeast University,Nanjing 211189,China
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摘要 采用常规铸造和热形变相结合的工艺制备Mg-6Gd-6Y-1Zn四元镁合金,并对其显微组织和力学性能进行较系统的研究。结果表明:合金的铸态组织主要由α-Mg,Mg24(GdYZn)5和具有18R-LPSO结构的Mg12Y1Zn1相组成。合金热挤压过程中Mg12Y1Zn1相被拉长,呈长条状沿挤压方向排列,而14H-LPSO相则分布于Mg12Y1Zn1相之间。挤压态合金在高温固溶处理后,Mg12Y1Zn1相溶入基体,而基体中的14H-LPSO相增加。挤压态合金经固溶和时效(T6)处理后,显微组织中呈现18R-LPSO,14H-LPSO结构和β'沉淀颗粒共存。对挤压后的合金直接进行时效(T5)处理过程中也发生了β'沉淀,但14H-LPSO相体积分数没有T6态多。合金在T6态的性能最好,强度和塑性达到了良好的匹配。
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甄睿
孙扬善
王章忠
方信贤
石卫
关键词 镁合金时效长周期相    
Abstract:A quaternary alloy with composition of Mg-6Gd-6Y-1Zn (mass fraction/%) was prepared by conventional casting and extrusion. The microstructure and aging behavior of the alloy were investigated. The results showed that the as-cast microstructure of the alloy consisted of the α-Mg matrix, Mg24(GdYZn)5 eutectic and Mg12Y1Zn1 phase. After extrusion the Mg12Y1Zn1 phase were stretched along the direction of extrusion, and the 14H-LPSO phase distributed between Mg12Y1Zn1 strips. Solid solution treatment at high temperature above 500℃ resulted in the dissolution of Mg12Y1Zn1 phase into the matrix and increase of the 14H-LPSO phase. When solution treated alloys was aged at temperature of 225℃ (T6 treatment), the 14H-LPSO phase and β' precipitated appear in microstructure. Aging of as extruded alloys (T5 treatment) also caused the formation of β' precipitates,however the volume fraction of 14H-LPSO phase was lower than that in specimens after T6 treatment. High tensile strength combined with good ductility was obtained from the alloy after T6-aging.
Key wordsmagnesium alloy    gadolinium    yttrium    zinc    aging    long-period staking ordered phase
收稿日期: 2012-08-16      出版日期: 2012-12-20
中图分类号: 

TG146.2

 
基金资助:

江苏省大学生实践创新训练计划资助项目(201211276313);南京工程学院大学生科技创新基金资助项目(20120215)

作者简介: 甄睿(1978—),女,博士研究生,讲师,从事镁合金组织性能及加工工艺的研究,联系地址:江苏省南京市江宁区弘景大道1号南京工程学院材料工程学院(211167),E-mail:zhenr@njit.edu.cn
引用本文:   
甄睿, 孙扬善, 王章忠, 方信贤, 石卫. 热处理对GWZ661变形镁合金组织与性能的影响[J]. 材料工程, 2012, 0(12): 39-44.
ZHEN Rui, SUN Yang-shan, WANG Zhang-zhong, FANG Xin-xian, SHI Wei. Effect of Heat Treatment on Microstructures and Mechanical Properties of Extruded GWZ661 Alloy. Journal of Materials Engineering, 2012, 0(12): 39-44.
链接本文:  
http://jme.biam.ac.cn/CN/      或      http://jme.biam.ac.cn/CN/Y2012/V0/I12/39
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