时效态Mg-10Gd-3Y-0.6Zr合金的拉伸断裂行为

林丹; 王磊; 孟凡强; 崔建忠; 乐启炽

doi:10.13374/j.issn1001-053x.2010.09.012

时效态Mg-10Gd-3Y-0.6Zr合金的拉伸断裂行为

1. 东北大学材料各向异性与织构教育部重点实验室, 沈阳 110004;
2. 东北大学材料电磁过程研究教育部重点实验室, 沈阳 110004

基金项目:

国家重点基础研究发展计划资助项目(No.2007CB613702,No.2007CB613701)

详细信息

作者简介:
林丹(1980-),女,博士研究生;王磊(1961-),男,教授,博士生导师,E-mail:wanglei@mail.neu.edu.cn

分类号: TG146.2
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出版历程
- 收稿日期: 2009-11-10
- 网络出版日期: 2021-08-09
- 刊出日期: 2010-09-24

Fracture behavior of aged Mg-10Gd-3Y-0.6Zr alloy under tension loading

1. Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education), Northeastern University, Shenyang 110004, China;
2. Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education), Northeastern University, Shenyang 110004, China

摘要

摘要:
研究了时效显微组织对Mg-10Gd-3Y-0.6Zr合金断裂行为的影响.结果表明:473K低温时效时,析出相小而密,由晶界析出相(GBP)引发的微裂纹在晶界处产生并沿晶内的择优取向扩展;温度达到523K时,GBP长大,应力集中仅在某些大尺寸GBP处出现,并引发GBP与基体分离,而产生微孔,微孔的聚集与长大导致了合金的断裂.微裂纹沿着孪晶与基体的界面扩展,在断口形成平滑刻面,而GBP的存在会加剧这一趋势.时效温度升高后,孪晶与GBP数量减少,滑移变形加剧,导致平滑刻面数量减少.
- 镁合金 /
- 析出相 /
- 拉伸性能 /
- 显微组织 /
- 断裂行为
Abstract:
The effect of aging microstructure on the fracture behavior of Mg-10Gd-3Y-0.6Zr alloy was investigated.The results show that precipitates in the alloy after low temperature aging at 473 K are finer and denser.Microcracks nucleate at grain boundaries due to grain boundary precipitations (GBPs),and then propagate transgranularly along the preferred orientation.When the aging temperature increases to 523 K,the size of GBPs enlarges.Microvoids nucleate by interface debonding between GBPs and the matrix which is caused by stress concentration at large GBPs;subsequently,their coalescence and growth result in final fracture.Otherwise,smoothing facets on the fracture surface form by microcracks propagating along the interfaces between twins and the matrix,and this tendency is intensified due to the existence of GBPs.When the aging temperature increases,the smoothing facets reduce as the twins and GBPs decrease and the slip deformation intensifies.
- magnesium alloys /
- precipitation /
- tensile properties /
- microstructure /
- fracture

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时效态Mg-10Gd-3Y-0.6Zr合金的拉伸断裂行为

作者简介: 林丹(1980-),女,博士研究生;王磊(1961-),男,教授,博士生导师,E-mail:wanglei@mail.neu.edu.cn

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Fracture behavior of aged Mg-10Gd-3Y-0.6Zr alloy under tension loading

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作者简介:
林丹(1980-),女,博士研究生;王磊(1961-),男,教授,博士生导师,E-mail:wanglei@mail.neu.edu.cn