Effect of Ti addition on the microstructure and mechanical properties of cast Mg-Gd-Y-Zn alloys

被引：49

作者：

Cheng, Peng ^{[1
]}

Zhao, Yuhong ^{[1
]}

Lu, Ruopeng ^{[1
]}

Hou, Hua ^{[1
]}

Bu, Zhiqiang ^{[1
]}

Yan, Feng ^{[1
]}

机构：

[1] North Univ China, Coll Mat Sci & Engn, Taiyuan 030051, Shanxi, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 708卷

基金：

山西省青年科学基金; 中国国家自然科学基金;

关键词：

Magnesium alloys; Long-period stacking ordered; Grain refinement; Microstructure; Mechanical properties; STACKING ORDERED STRUCTURES; HIGH-STRENGTH; TENSILE PROPERTIES; GRAIN-REFINEMENT; MAGNESIUM ALLOY; SOLID-SOLUTION; HEAT-TREATMENT; COOLING RATE; ZR ALLOYS; AS-CAST;

D O I：

10.1016/j.msea.2017.10.006

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effect of Ti addition on the microstructure and mechanical properties of cast Mg-Gd-Y-Zn alloys was investigated. Ti exhibited a refinement effect comparable to that of Zr in the as-cast condition. With the increase of Ti content, the phenomenon of grain refinement and homogenization was more obvious, especially for solution treated alloys. The finest grains were obtained with 0.8 wt% Ti and were composed of a-Mg and refined Mgs(Gd, Y, Zn) in the as-cast structure. Zr and Ti could be found along the grain boundaries. After solid solution treatment, Zr was still concentrated in the vicinity of the grain boundaries, while Ti was uniformly dispersed in the a Mg matrix. The Ti-refined alloys exhibited superior grain size stability and mechanical properties. In addition, the mechanical properties of the considered alloys were improved due to the transition from Mgs(Gd, Y, Zn) to long-period stacking ordered (LPSO) phase during the heat treatment. Subsequent aging at 220 degrees C resulted in remarkable precipitation hardening and consequently the strength was significantly improved. The Ti-refined alloy exhibited higher ultimate tensile strength and elongation than the alloy containing the same amount of Zr, with an increase of 20 MPa and 29%, respectively.

引用

页码：482 / 491

页数：10

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