時效態Mg-10Gd-3Y-0.6Zr合金的拉伸斷裂行為

林丹; 王磊; 孟凡強; 崔建忠; 樂啟熾

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

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時效態Mg-10Gd-3Y-0.6Zr合金的拉伸斷裂行為

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

1. 東北大學材料各向異性與織構教育部重點實驗室, 沈陽 110004;
2. 東北大學材料電磁過程研究教育部重點實驗室, 沈陽 110004

基金項目:

國家重點基礎研究發展計劃資助項目(No.2007CB613702,No.2007CB613701)

詳細信息

作者簡介:
林丹(1980-),女,博士研究生;王磊(1961-),男,教授,博士生導師,E-mail:wanglei@mail.neu.edu.cn

中圖分類號: TG146.2
計量
- 文章訪問數: 165
- HTML全文瀏覽量: 27
- PDF下載量: 5
- 被引次數: 0
出版歷程
- 收稿日期: 2009-11-11

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:
研究了時效顯微組織對Mg-10Gd-3Y-0.6Zr合金斷裂行為的影響.結果表明:473K低溫時效時,析出相小而密,由晶界析出相(GBP)引發的微裂紋在晶界處產生并沿晶內的擇優取向擴展;溫度達到523K時,GBP長大,應力集中僅在某些大尺寸GBP處出現,并引發GBP與基體分離,而產生微孔,微孔的聚集與長大導致了合金的斷裂.微裂紋沿著孿晶與基體的界面擴展,在斷口形成平滑刻面,而GBP的存在會加劇這一趨勢.時效溫度升高后,孿晶與GBP數量減少,滑移變形加劇,導致平滑刻面數量減少.
- 鎂合金 /
- 析出相 /
- 拉伸性能 /
- 顯微組織 /
- 斷裂行為
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