Effect of Ca on Microstructures and Mechanical Properties of Mg-5Al-1Bi Alloys

Dang Shu’e; Zhao Mingfeng; Yao Hongkang; Fu Liying

doi:10.15980/j.tzzz.2012.07.025

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Effect of Ca on Microstructures and Mechanical Properties of Mg-5Al-1Bi Alloys
Vol. 32, Issue 7, Pages: 593-597(2012)
Published： 2012 ，
DOI： 10.15980/j.tzzz.2012.07.025

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[1]党淑娥,赵明风,姚宏康,付丽英.Ca对Mg-5Al-1Bi合金显微组织和力学性能的影响[J].特种铸造及有色合金,2012,32(07):593-597.

Dang Shu’e, Zhao Mingfeng, Yao Hongkang, et al. Effect of Ca on Microstructures and Mechanical Properties of Mg-5Al-1Bi Alloys. [J]. Special Casting & Nonferrous Alloys 32(7):593-597(2012)
[1]党淑娥,赵明风,姚宏康,付丽英.Ca对Mg-5Al-1Bi合金显微组织和力学性能的影响[J].特种铸造及有色合金,2012,32(07):593-597. DOI： 10.15980/j.tzzz.2012.07.025.

Dang Shu’e, Zhao Mingfeng, Yao Hongkang, et al. Effect of Ca on Microstructures and Mechanical Properties of Mg-5Al-1Bi Alloys. [J]. Special Casting & Nonferrous Alloys 32(7):593-597(2012) DOI： 10.15980/j.tzzz.2012.07.025.

摘要

使用X射线衍射仪、金相显微镜、扫描电镜、能谱仪及力学性能测试等试验手段

研究了Ca含量对铸态Mg-5Al-1Bi镁合金显微组织和力学性能的影响。结果表明

铸态Mg-5Al-1Bi镁合金由α-Mg基体和β-Mg17Al12相组成

加入Ca后

合金晶粒细化

β-Mg17Al12相的数量减少

由连续变得较为分散。当Ca含量达到3%时

合金中生成新的第二相Al2Ca。高熔点相Al2Ca在高温条件下能钉扎晶界

阻碍晶界滑移

有利于提高合金的高温蠕变性能。合金硬度和屈服强度随着Ca含量的增加而提高

而抗拉强度和伸长率下降。

Abstract

Effects of Ca content on microstructure and mechanical properties of Mg-5Al-1Bi alloy were investigated by XRD（X-ray diffraction）

OM（optical microscope）

SEM（scanning electron microscope）

EDS（energy dispersive spectrometer） and mechanical property testing.The results show that the as-cast microstructure of the Mg-5Al-1Bi alloy is composed of matrix α-Mg and β-Mg17Al12 phases.With the addition of Ca

grains are refined

and the amount of phase Mg17Al12 is decreased with the morphologies transformed from continuous shape into more dispersed ones.The new secondary phase Al2Ca is generated with the Ca content increasing to 3%.Al2Ca phase with high melting point can pin the grain boundaries to restraint its slippage

which is beneficial to improve the high temperature creep resistance of the alloys.The hardness

yield strength are increased with the addition of Ca content

however

the tensile strength and elongation are decreased.