Investigation of two-phase Mg-Gd-Ni alloys with highly stable long period stacking ordered phases

被引：34

作者：

Yin, Jian ^{[1
]}

Lu, Chunhui ^{[1
]}

Ma, Xiujun ^{[1
]}

Dai, Binyu ^{[1
]}

Chen, Hai-lin ^{[2
]}

机构：

[1] Nanchang Hangkong Univ, Sch Aeronaut Mfg Engn, Nanchang 330063, Peoples R China

[2] Thermocalc Software AB, SE-11364 Stockholm, Sweden

来源：

INTERMETALLICS | 2016年 / 68卷

基金：

中国国家自然科学基金;

关键词：

Intermetallics; Alloy design; Thermal stability; Heat treatment; Microstructure; MECHANICAL-PROPERTIES; ZN; MICROSTRUCTURE; EQUILIBRIA; STRENGTH; TRANSFORMATION; STABILITY; 18R; 14H;

D O I：

10.1016/j.intermet.2015.09.006

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effects of the Ni addition on the microstructures of Mg-2Gd-xNi (at.%, x = 0, 0.25, 0.5 and 1) alloys were systematically investigated. A series of two-phase Mg-Gd-Ni alloys consisting of long period stacking ordered (LPSO) phase and alpha-Mg were obtained. The LPSO phase presented block-like shape and was distributed between alpha-Mg dendrite arms. Its volume fraction was found to be proportional to the Ni content, ranging from 0 to similar to 40% with the Ni content increasing from 0 to 1 at.%. After a heat treatment at 500 degrees C for 100 h, the LPSO phase experienced a structure transformation from 18R to 14H but was hardly dissolved into the a-Mg matrix, which evidenced a high thermal stability. The mechanism for the effects of the Ni addition on the formation of the LPSO phase was discussed. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：63 / 70

页数：8

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