Polymorphism in the Laves-phase precipitates of a quinternary Nb-Mo-Cr-Al-Si alloy

被引：13

作者：

Hu, Yan-Ling ^{[1
]}

Vasiliev, Alexandre ^{[1
]}

Zhang, Lichun ^{[1
]}

Aindow, Mark ^{[1
]}

Song, Kai ^{[1
]}

机构：

[1] Univ Connecticut, Inst Mat Sci, Dept Chem Mat & Biomol Engn, Mat Sci & Engn Program, Storrs, CT 06269 USA

来源：

SCRIPTA MATERIALIA | 2009年 / 60卷 / 02期

关键词：

Transmission electron microscopy (TEM); Laves phases; Metastable phases; Precipitation; Polymorphic phase transformation; TEMPERATURE MECHANICAL-PROPERTIES; HIGH-PRESSURE; STABILITY; CR2TA;

D O I：

10.1016/j.scriptamat.2008.08.034

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Transmission electron microscopy has been used to study the precipitates that develop in the A2 phase of an Nb-Mo-Cr-Al-Si alloy upon heat treatment. The precipitates include a Laves-phase that adopts the cubic C15 structure initially and the hexagonal C14 structure in the later stages of precipitation. The morphologies, orientation relationships and defect microstructures indicate that the metastable C15 phase arises due to tensile coherency stresses and that a synchroshear polymorphic transformation to the equilibrium C14 phase occurs as these relax. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：72 / 75

页数：4

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