Phase control and formation mechanism of Al-Mn(-Fe) intermetallic particles in Mg-Al-based alloys with FeCl3 addition or melt superheating
Phase control and formation mechanism of Al-Mn(-Fe) intermetallic particles in Mg-Al-based alloys with FeCl3 addition or melt superheating
复制标题
添加FeCl3或熔体过热的Mg-Al基合金中Al-Mn(-Fe)金属间化合物的相控及形成机制
DOI：
10.1016/j.actamat.2016.05.012
复制
发表时间：
2016-08-01
期刊：
影响因子：
9.4
通讯作者：
Liu, Xiangfa
中科院分区：
文献类型：
--
作者：
Han, Guang;Liu, Xiangfa
在本研究中，我们鉴定了不同Al含量、添加FeCl3或熔体过热条件下mg -Al基合金中Al- mn （-Fe）金属间颗粒的晶体结构并阐明了其形成机理。通过一种新开发的颗粒萃取方法收集形成的Al-Mn（-Fe）颗粒，进行结构、化学和形态表征。当Al含量从3 wt%增加到9 wt%时，AZ31中的主要Al-Mn相由tau-Al0.89Mn1.11转变为AZ91中的gamma(2)-Al8Mn5，而FeCl3的加入和熔体过热均促进了AZ31和AZ63中gamma(2)-Al-8(Mn,Fe)(5)的形成。此外，通过调节FeCl3添加量或熔体过热温度，AZ31和AZ63中形成了不同形貌的γ (2)-Al-8(Mn,Fe)(5)颗粒，包括准立方、八荚体和多面体颗粒。本研究为控制mg - al基合金中Al-Mn（-Fe）金属间颗粒的晶体结构和形貌提供了几种重要的方法。(C) 2016材料学报Elsevier Ltd.出版。版权所有。
In this study, we identify the crystal structures and elucidate the formation mechanism of Al-Mn(-Fe) intermetallic particles formed in Mg-Al-based alloys with varied Al contents, FeCl3 addition or melt superheating. The formed Al-Mn(-Fe) particles were collected through a newly developed particle extraction method for structural, chemical and morphological characterizations. It is found that increasing the Al content from 3 wt% to 9 wt% changes the major Al-Mn phase from tau-Al0.89Mn1.11 in AZ31 to gamma(2)-Al8Mn5 in AZ91, and both FeCl3 addition and melt superheating promote the formation of gamma(2)-Al-8(Mn,Fe)(5) in AZ31 and AZ63. In addition, through tuning FeCl3 addition level or melt superheating temperature, different morphologies of the gamma(2)-Al-8(Mn,Fe)(5) particles are formed in AZ31 and AZ63, including quasi-cubes, octa-pod microstructures and polyhedral particles. This study provides several important approaches to control the crystal structure and morphology of Al-Mn(-Fe) intermetallic particles formed in Mg-Al-based alloys. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.