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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 6    December 2007

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Crystallography of Mg2Sn precipitates in Mg-Sn-Mn-Si alloy
ZHANG Min(张 敏)1, ZHANG Wen-zheng(张文征)1, ZHU Guo-zhen(祝国珍)1, YU Kun(余 琨)2

1. Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; 2. Department of Materials Science and Engineering, Central South University, Changsha 410083, China

Abstract: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(β) 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(α) matrix are repeatedly detected, and two of them have never been reported before. Most of the lath-shaped β precipitates exhibit two OR. One is (0001)α//(110)β, [001]β (OR-1), with the long axis along [001]β; and the other is (0001)α//(110)β, (OR-2, a new OR), with the long axis along . The polygonal β exhibits (0001)α//(111)β, (OR-3), with several pairs of facets. The plate-shaped β exhibits (0001)α//(111)β, deviates by about 9˚ from (OR-4, a new OR).

 

Key words: Mg-Sn alloy; crystallography; Mg2Sn precipitate; orientation relationship

ISSN 1672-7029
CN 43-1423/U

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