添加Al对含LPSO相的Mg-Gd-Y-Zn-Mn合金晶粒细化及相变的影响

Effect of Al Addition on Grain Refinement and Phase Transformation of the Mg-Gd-Y-Zn-Mn Alloy Containing LPSO Phase.

作者信息

Zuo Jing, Zhang Mingquan, Nakata Taiki, Wang Guisong, Li Danyang, Shi Hailong, Xu Chao, Wang Xiaojun, Li Wenjun, Fan Guohua, Geng Lin, Kamado Shigeharu

机构信息

Department of Mechanical Engineering, Nagaoka University of Technology, Nagaoka 940-2188, Japan.

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.

出版信息

Materials (Basel). 2022 Feb 22;15(5):1632. doi: 10.3390/ma15051632.

DOI:10.3390/ma15051632

PMID:35268862

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8911055/

Abstract

The effect of 0−1.0 at.% Al additions on grain refinement and phase transformation of the Mg-2.0Gd-1.2Y-0.5Zn-0.2Mn (at.%) alloy containing a long period stacking ordered (LPSO) phase was investigated in this work. The addition of Al promoted the formation of the Al2RE phase in the Mg-2.0Gd-1.2Y-0.5Zn-0.2Mn (at.%) alloy, and the dominant secondary phases in the as-cast Mg-2.0Gd-1.2Y-0.5Zn-0.2Mn-1.0Al (at.%) alloy were the Mg3RE phase, LPSO phase, and Al2RE phase. With increased Al addition, the area fraction of the Al2RE phase increased monotonously, while the area fraction of LPSO phase and Mg3RE phase decreased gradually. The orientation relationship between the Al2RE phase and the α-Mg matrix was determined to be <112>Al2RE//<112¯0>α-Mg, {101}Al2RE//{101¯0}α-Mg, which was not affected by Zn and Mn concentrations in the Al2RE phase. Since the Al2RE particles with a size more than 6 μm located at the center of grains could act as nucleants for α-Mg grains, the average grain size of the as-cast alloys decreased from 276 μm to 49 μm after 1.0% Al addition. The effect of the Al addition on the grain refinement of the Mg-2.0Gd-1.2Y-0.5Zn-0.2Mn alloy was comparable to that of the Zr refined counterpart.

摘要

本工作研究了添加0−1.0 at.% 的Al对含长周期有序堆垛（LPSO）相的Mg-2.0Gd-1.2Y-0.5Zn-0.2Mn（at.%）合金的晶粒细化和相变的影响。Al的添加促进了Mg-2.0Gd-1.2Y-0.5Zn-0.2Mn（at.%）合金中Al2RE相的形成，铸态Mg-2.0Gd-1.2Y-0.5Zn-0.2Mn-1.0Al（at.%）合金中的主要次生相为Mg3RE相、LPSO相和Al2RE相。随着Al添加量的增加，Al2RE相的面积分数单调增加，而LPSO相和Mg3RE相的面积分数逐渐降低。确定Al2RE相与α-Mg基体之间的取向关系为<112>Al2RE//<112¯0>α-Mg，{101}Al2RE//{101¯0}α-Mg，这不受Al2RE相中Zn和Mn浓度的影响。由于尺寸大于6μm的Al2RE颗粒位于晶粒中心可作为α-Mg晶粒的形核剂，添加1.0%Al后铸态合金的平均晶粒尺寸从276μm降至49μm。Al添加对Mg-2.0Gd-1.2Y-0.5Zn-0.2Mn合金的晶粒细化效果与Zr细化的对应合金相当。