[1]朱蓓蓓,孙扬善,贾迪,等.Mg-Sm系合金的显微组织及力学性能[J].东南大学学报(自然科学版),2009,39(3):610-614.[doi:10.3969/j.issn.1001-0505.2009.03.036]
 Zhu Beibei,Sun Yangshan,Jia Di,et al.Microstructure and mechanical properties of Mg-Sm alloys[J].Journal of Southeast University (Natural Science Edition),2009,39(3):610-614.[doi:10.3969/j.issn.1001-0505.2009.03.036]
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Mg-Sm系合金的显微组织及力学性能()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
39
期数:
2009年第3期
页码:
610-614
栏目:
材料科学与工程
出版日期:
2009-05-20

文章信息/Info

Title:
Microstructure and mechanical properties of Mg-Sm alloys
作者:
朱蓓蓓 孙扬善 贾迪 薛烽
东南大学材料科学与工程学院,南京 211189; 东南大学江苏省先进金属材料高技术研究重点实验室, 南京 211189
Author(s):
Zhu Beibei Sun Yangshan Jia Di Xue Feng
School of Materials Science and Engineering, Southeast University, Nanjing 211189,China
Jiangsu Key Laboratory of Advanced Metallic Materials,Southeast University,Nanjing 211189, China
关键词:
合金 挤压 时效 脱溶
Keywords:
Mg Sm alloy extrusion aging precipitation
分类号:
TG146.22
DOI:
10.3969/j.issn.1001-0505.2009.03.036
摘要:
研究了Mg-(1%~3%)Sm(质量分数)合金在多种状态下的显微组织和力学性能.采用光学金相分析(OM),扫描电子显微分析(SEM),X射线衍射分析(XRD)等多种分析和测试手段,系统研究了挤压工艺及热处理(固溶处理、时效处理)对Mg-Sm系合金显微组织和力学性能的影响.结果显示,合金的铸态组织由α-Mg基体和Mg41Sm5组成.合金经热挤压加工后,Mg41Sm5相沿挤压方向呈纤维或颗粒状分布.在420 ℃挤压时,试样内发生了动态再结晶,致使挤压后合金的强度和塑性得到大幅度改善.固溶以及时效处理后,合金的性能比铸态有较大提高; 而采用挤压后的直接时效(T5)处理,可获得良好的综合力学性能.因此,Sm可以考虑作为强化变形镁合金的添加元素.
Abstract:
Three binary Mg-(1% to 3%)Sm alloys were prepared and their microstructure and mechanical properties were investigated. The effects of extrusion and heat treatment on the microstructure and mechanical properties of Mg-Sm binary alloys were investigated by using an optical microscope(OM), a scanning electron microscope(SEM), and an X-ray diffract meter(XRD). The results show that the microstructure of the alloys prepared as-cast consists of an α-Mg matrix and Mg41Sm5 intermetallic compound. After the hot-extrusion, the Mg41Sm5 phase shows fibrous and granular morphology along the extrusion direction. Dynamic recrystallization occurs during extrusion at 420 ℃, resulting in a remarkable increase in both strength and ductility of the alloys. After the solution and aging treatment, the mechanical properties of the alloys are much higher than those under as-cast conditions and optimum properties are obtained from the specimens aged directly after extrusion. As a result, Sm can be considered as an additive element to make wrought magnesium alloys stronger.

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备注/Memo

备注/Memo:
作者简介: 朱蓓蓓(1984—),女,硕士生; 孙扬善(联系人),男,教授,博士生导师,yssun@seu.edu.cn.
基金项目: 国家科技支撑计划资助项目(2006BAE04B07).
引文格式: 朱蓓蓓,孙扬善,贾迪,等.Mg-Sm系合金的显微组织及力学性能[J].东南大学学报:自然科学版,2009,39(3):610-614. [doi:10.3969/j.issn.1001-0505.2009.03.036]
更新日期/Last Update: 2009-05-20