Microstructure and Mechanical Properties of Low-pressure Die Casting Mg-10Gd-3Y-0.7Zr Alloy

Hu Fengrong; Yu Guokang; Sun Wanting; Zou Chunming; Wang Hongwei; Wei Zunjie

doi:10.15980/j.tzzz.2015.10.025

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Microstructure and Mechanical Properties of Low-pressure Die Casting Mg-10Gd-3Y-0.7Zr Alloy
Vol. 35, Issue 10, Pages: 1090-1094(2015)
Published： 2015 ，
DOI： 10.15980/j.tzzz.2015.10.025

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[1]户凤荣,余国康,孙婉婷,邹鹑鸣,王宏伟,魏尊杰.低压铸造Mg-10Gd-3Y-0.7Zr合金的组织及力学性能[J].特种铸造及有色合金,2015,35(10):1090-1094.

Hu Fengrong, Yu Guokang, Sun Wanting, et al. Microstructure and Mechanical Properties of Low-pressure Die Casting Mg-10Gd-3Y-0.7Zr Alloy. [J]. Special Casting & Nonferrous Alloys 35(10):1090-1094(2015)
[1]户凤荣,余国康,孙婉婷,邹鹑鸣,王宏伟,魏尊杰.低压铸造Mg-10Gd-3Y-0.7Zr合金的组织及力学性能[J].特种铸造及有色合金,2015,35(10):1090-1094. DOI： 10.15980/j.tzzz.2015.10.025.

Hu Fengrong, Yu Guokang, Sun Wanting, et al. Microstructure and Mechanical Properties of Low-pressure Die Casting Mg-10Gd-3Y-0.7Zr Alloy. [J]. Special Casting & Nonferrous Alloys 35(10):1090-1094(2015) DOI： 10.15980/j.tzzz.2015.10.025.

摘要

采用低压铸造工艺制备了Mg-10Gd-3Y-0.7Zr合金

利用OM、SEM、EDS、DTA等手段研究了合金在热处理前、后的微观组织演变

并对其热处理工艺进行优化

以提高合金的综合力学性能

并结合组织变化分析了合金的热处理强化机制。结果表明

Mg-10Gd-3Y-0.7Zr合金的铸态组织主要由α-Mg初生相和Mg24（Gd

Y）5共晶相组成

且Mg24（Gd

Y）5共晶相呈网状分布在晶界上。热处理后

连续分布的Mg24（Gd

Y）5相消失

主要为α-Mg和颗粒状Mg5（Gd

Y）相。在520℃×14h+230℃×20h热处理效果最佳。经过520℃固溶14h后

合金强度变化不大

但是伸长率由5.5%变为13.4%

提高了144%。230℃时效处理后

合金的综合力学性能优异

抗拉强度和屈服强度达到307.8 MPa和200.4 MPa

伸长率为7.2%

较热处理前分别提高了41%、38%和31%。

Abstract

Mg-10Gd-3Y-0.7Zr alloy was prepared by low-pressure casting.Microstructure evolution of Mg-10Gd-3Y-0.7Zr alloy was observed by optical microscope

scanning electron microscope

energy disfraction spectrometer and differential thermal analysis.The heat treatment process was optimized to improve the mechanical properties of the alloy

and strengthening mechanism of heat treatment on properties of the alloy was described based on microstructure analysis.The results indicate that the as-cast microstructure of Mg-10Gd-3Y-0.7Zr alloy is composed of primaryα-Mg and eutectic Mg24（Gd

Y）5phase which is distributed coherently along the grain boundary.After heat treatment

the continuous distributed Mg24（Gd

Y）5phase disappears

and primaryα-Mg and Mg5（Gd

Y）particles exist mainly in the alloy.Under 520℃×14h+230℃×20htreatment conditions

the desirable mechanical properties can be obtained.After solution heat treatment at 520 ℃for 4h

the strength of Mg-10Gd-3Y-0.7Zr alloy exhibits neglected change

while the elongation is increased from 5.5% to 13.4%

increased by 144%.After aging at 230 ℃

the mechanical properties of Mg-10Gd-3Y-0.7Zr alloy exhibit excellent

where the tensile strength

yield strength and elongation reach 307.8MPa