Hardening precipitation in a Mg-4Y-3RE alloy
Hardening precipitation in a Mg-4Y-3RE alloy
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DOI：
10.1016/s1359-6454(03)00391-4
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发表时间：
2003-10-20
期刊：
影响因子：
9.4
通讯作者：
Pisch, A
中科院分区：
文献类型：
--
作者：
Antion, C;Donnadieu, P;Pisch, A
用透射电子显微镜和小角X射线散射(SAXS)研究了150℃时效的Mg-Y-ND基合金的早期析出过程。前者提供了有关沉淀物的性质、形态和大小的信息，而后者则增加了关于沉淀物的大小和体积分数的定性和定量信息。150℃时效过程中形成了DO19单面析出物，进一步发展为具有片状和球状形貌的β“和β‘相，150℃时效样品的透射电子显微镜观察揭示了单面DO19-β”析出物有序排列形成BCO-β’结构的机制。在250℃下的附加检查显示DO19-β“-->；BCO-β‘转变，以及β(1)沉淀。根据透射电子显微镜的结果讨论了从SAXS推断的体积分数的估计。(C)2003年材料学报公司。由爱思唯尔有限公司出版。保留所有权利。
Early stages of precipitation in a Mg-Y-Nd based alloy aged at 150 degreesC have been studied using TEM and small angle X-ray scattering (SAXS). The former brings information concerning nature, morphology and size of precipitates, and the latter adds qualitative and quantitative information concerning populations of precipitates in terms of size and volume fraction. Precipitation at 150 degreesC involves formation of DO19 monoplanar precipitates, which further develop into the beta" and beta' phases having platelet and globular morphologies, respectively. TEM observations on samples aged at 150 degreesC reveal the formation mechanism of the bco-beta' structure by the ordering of monoplanar DO19-beta" precipitates. Additional examinations at 250 degreesC revealed the DO19-beta"-->bco-beta' transformation, as well as beta(1) precipitates. Estimation of the volume fraction deduced from SAXS is discussed on the basis of the TEM results. (C) 2003 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.