Crystallography of Mg2Sn precipitates in Mg-Sn-Mn-Si alloy

• Published in: Transactions of Nonferrous Metals Society of China Vol. 17; no. 6; pp. 1428 - 1432
• Main Author: 张敏 张文征 祝国珍 余琨
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2007; Laboratory of Advanced Materials, Department of Materials Science and Engineering,Tsinghua University, Beijing 100084, China%Department of Materials Science and Engineering, Central South University, Changsha 410083, China
• Subjects: crystallography; Mg-Sn alloy; Mg-Sn合金; Mg2Sn precipitate; orientation; relationship; 定向联系; 晶体学; 沉淀物; Mg-Sn alloy; crystallography; orientation; relationship; Mg2Sn precipitate; orientation relationship
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(07)60289-1

The microstructures of a Mg-Sn based alloy with trace additions of Mn and Si after various ageing heat-treatments were investigated. The alloy was found to contain mostly Mg2Sn（fl） precipitates. The morphology and orientation relationships（OR） of Mg2Sn precipitates were analyzed by using TEM. The Mg2Sn precipitates mainly exhibit three shapes： lath, polygon and plate. Four ORs between Mg2Sn precipitates and Mg（a） matrix are repeatedly detected, and two of them have never been reported before. Most of the lath-shaped fl precipitates exhibit two OR. One is （0001）α/（110）β, [11^- 20]α//[001]β （OR-I）, with the long axis along [11^-20]α//[001]β; and the other is （0001）α/（110）β, [1^-100]α//[31^1]β （OR-2, a new OR）, with the long axis along [1^100]α//[31^-1]β. The polygonal β exhibits （0001）α/（111）β, [2^110]β//[^-110]β（OR-3）, with several pairs of facets. The plate-shaped fl exhibits （0001）α/（111）β, [2^-11 0]α deviates by about 9 from [^- 110]β （OR-4, a new OR）.