Effect of Gd content on microstructure and mechanical properties of Mg-Y-RE-Zr alloys

来源期刊：中国有色金属学报(英文版)2008年增刊第1期

论文作者：张奎 李兴刚 李永军 马鸣龙

文章页码：12 - 16

Key words：Mg-Y-RE-Zr alloy; Gd; microstructure; mechanical properties

Abstract: Four kinds of Mg-Y-RE-Zr alloys with different Gd contents were prepared, and the effect of Gd content on microstructure and mechanical properties of the alloys was researched. Based on the experimental investigation, the compounds at the grain boundaries are mainly Mg₂₄Y₅, Mg₄₁Nd₅, and Mg₅Gd phases. The average grain size of as-cast alloys is 50-60 μm. After T4 (535 ℃, 24 h) treatment, Mg₅Gd phases mostly decompose and dissolve into the matrix, and the disperse spotted phases are mainly Mg₂₄Y₅ and Mg₄₁Nd₅ phases. After extruding and ageing (250 ℃, 5 h), the grain size is refined and some grains abnormally grow up to about 40 μm. With Gd content increasing, the ultimate tensile strength, yield strength of as-cast alloys and the extruded bars after ageing are improved, but the elongation is decreased.

基金信息：the National Science and Technique Support Program during the 11th Five-Year Period of China
the National Basic Research Program of China