高强高韧Mg 8.5Gd 2.0Y 1.0Ag 0.4Zr合金的组织与性能

陈杰; 王渠东; 赵政; 丁文江

文章摘要

陈杰,王渠东,赵政,丁文江.高强高韧Mg 8.5Gd 2.0Y 1.0Ag 0.4Zr合金的组织与性能[J].高技术通讯(中文),2010,20(4):427~430

高强高韧Mg 8.5Gd 2.0Y 1.0Ag 0.4Zr合金的组织与性能

Microstructure and mechanical properties of Mg－8.5Gd－2.0Y－1.0Ag－0.4Zr alloy with high strength and ductility

DOI：

中文关键词: 镁合金，显微组织，力学性能，时效强化，Mg－Gd－Y－Ag－Zr合金

英文关键词: magnesium alloys, microstructure, mechanical properties, precipitation strengthening, Mg－Gd－Y－Ag－Zr alloys

基金项目:国家自然科学基金(No. 50674067)，973计划(No.61330)资助项目

作者	单位
陈杰	上海交通大学轻合金精密成型国家工程研究中心
王渠东	上海交通大学轻合金精密成型国家工程研究中心；上海交通大学金属基复合材料国家重点实验室
赵政	上海交通大学轻合金精密成型国家工程研究中心
丁文江	上海交通大学轻合金精密成型国家工程研究中心；上海交通大学金属基复合材料国家重点实验室

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中文摘要:

研究了高强高韧Mg-8.5Gd-2.0Y-1.0Ag-0.4Zr (wt.%)合金的显微组织和力学性能。结果表明，该合金铸态组织细小，主要由α-Mg固溶体、晶界析出相Mg5(GdY)以及分布在晶粒内部的Zr核组成；T4态时晶界析出相基本完全消失，但出现了一些方块相γ；合金具有明显的时效硬化效果，且随着时效温度的提高，合金的峰值时效硬度下降，峰值时间相应缩短。经200℃峰值时效处理后表现出极为优异的室温力学性能，抗拉强度(UTS)和延伸率分别达到396MPa和9.1%，显著的时效强化是该合金具有优异力学性

英文摘要:

The microstructure and mechanical properties of Mg－8.5Gd－2.0Y－1.0Ag－0.4Zr (wt.%) were investigated. The results show that this ascast alloy has fine microstructure and consists of α Mg solid solution, grain boundary precipitates Mg－5(GdY), and intracrystalline zirconium rich cores. After solution treatment, the grain boundary precipitates almost disappear completely and some cubic shaped γ compounds are observed. The alloy shows remarkable age hardening response, and the age hardness, as well as the time to peak decrease with the increasing age temperature. After peak aged at 200℃, the alloy exhibits very attractive mechanical properties, whose ultimate tensile strength (UTS) and elongation reach 396MPa and 9.1% respectively at room temperature, with the remarkable precipitation strengthening being the major contributor to its excellent mechanical properties. Such excellent combination of strength and ductility is peculiar for ordinary casting Mg alloys, and would be of great significance for the extensive applications of Mg alloys.

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