On the strain accommodation of β1 precipitates in magnesium alloy WE54

被引：49

作者：

Xu, Z. ^{[1
]}

Weyland, M. ^{[1
,2
]}

Nie, J. F. ^{[1
]}

机构：

[1] Monash Univ, Dept Mat Engn, Clayton, Vic 3800, Australia

[2] Monash Univ, Monash Ctr Elect Microscopy, Clayton, Vic 3800, Australia

来源：

ACTA MATERIALIA | 2014年 / 75卷

基金：

澳大利亚研究理事会;

关键词：

Magnesium alloys; Precipitation; Transformation strain; Interface; Self-accommodation; TRANSMISSION ELECTRON-MICROSCOPY; Y-ND ALLOY; PHASE-FIELD SIMULATION; SHAPE-MEMORY ALLOYS; RARE EARTH ALLOYS; AL-NB ALLOYS; SELF-ACCOMMODATION; ORTHORHOMBIC TRANSFORMATION; MICROSTRUCTURAL EVOLUTION; MARTENSITE VARIANTS;

D O I：

10.1016/j.actamat.2014.04.073

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The distribution arrangements of beta(1) precipitate plates in Mg-Y-Nd alloy WE54 are systematically examined using high-angle annular dark-field and bright-field scanning transmission electron microscopy. It is found that the beta(1) plates often form with a triadic configuration that is the building block of a honeycomb structure. In a triad, three beta(1) variants are separated by 120 degrees pointing outward with an equilateral-triangular Mg phase isolated in the triadic centre. The isolated Mg phase is related to the surrounding Mg matrix by a unique 10.5 degrees rotation about [0001](alpha). The interface between the isolated Mg phase and the three surrounding beta(1) variants is ((2) over bar2 (4) over bar)(beta 1))//(2 (2) over bar 00)(alpha-iso), which is fully coherent and identical to that between the broad side of beta(1) variants and surrounding Mg matrix ((2) over bar 24)(beta 1)//(2 (2) over bar 00)(alpha). It is shown that the rotation of the isolated Mg phase is necessary to minimise the shear strain energy and the interfacial energy of the triadic precipitates. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：122 / 133

页数：12

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