Influences of Cooling Rate on Microstructure and Mechanical Properties of Mg-5Al -0.5Y Alloy

Wang Wuxiao; Guan Lei; Yang Jiandong; Zhang Sha

doi:10.15980/j.tzzz.2012.02.030

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Influences of Cooling Rate on Microstructure and Mechanical Properties of Mg-5Al -0.5Y Alloy
Vol. 32, Issue 2, Pages: 188-191(2012)
Published： 2012 ，
DOI： 10.15980/j.tzzz.2012.02.030

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[1]王武孝,关蕾,杨建东,张莎.冷却速度对Mg-5Al-0.5Y合金组织和性能的影响[J].特种铸造及有色合金,2012,32(02):188-191.

Wang Wuxiao, Guan Lei, Yang Jiandong, et al. Influences of Cooling Rate on Microstructure and Mechanical Properties of Mg-5Al -0.5Y Alloy. [J]. Special Casting & Nonferrous Alloys 32(2):188-191(2012)
[1]王武孝,关蕾,杨建东,张莎.冷却速度对Mg-5Al-0.5Y合金组织和性能的影响[J].特种铸造及有色合金,2012,32(02):188-191. DOI： 10.15980/j.tzzz.2012.02.030.

Wang Wuxiao, Guan Lei, Yang Jiandong, et al. Influences of Cooling Rate on Microstructure and Mechanical Properties of Mg-5Al -0.5Y Alloy. [J]. Special Casting & Nonferrous Alloys 32(2):188-191(2012) DOI： 10.15980/j.tzzz.2012.02.030.

摘要

利用光学显微镜、扫描电镜、X射线衍射仪和硬度测试仪等试验手段

研究了金属型、石墨型及砂型铸造Mg-5Al-0.5Y合金分别在冷却速度为200、150和60℃/min时的微观组织和硬度的变化

并对其机理进行分析。结果表明

随着冷却速度的降低

α-Mg晶粒粗化

晶粒平均尺寸从52.83μm增大到68.96μm

增幅30.53%

而离异共晶β-Mg17Al12相从连续网状分布变为粗大的断续分布

相对含量也由10.35%减少至8.67%

降幅为16.23%;冷却速度的降低及晶粒的粗大化

还致使合金硬度也随之下降

由56.4（HV）降至51.3（HV）。

Abstract

The microstructure and hardness changes of cast Mg-5Al-0.5Y alloy in permanent mold

graphite mold and sand mould were comparatively investigated by optical microscopy（OM）

scanning electron microscope（SEM）

X-ray diffraction （XRD） and hardness tester at the cooling rates of 200 ℃/min、150 ℃/min and 60 ℃/min

and mechanism was analyzed. The results show that: with the decrease of the cooling rate

α-Mg grain sizes are coarsened

and the average size is increased from 52.83 μm to 68.96 μm

increased by 30.53%

while the β-Mg17Al12 phase exhibits continuous to discontinuous nets distributions

and its relative content is decreased from 10.35% to 8.67%

reduced by 16.23%. The hardness of Mg-5Al-0.5Y alloy is decreased from 56.4 HV to 51.3 HV as a result of the decrease of cooling rate and coarseness of grain sizes.