Effect of Homogenizing Heat Treatment on Microstructure and Hardness of AZ80-2.0Ca Magnesium Alloy

Wang Zhongjun; Xu Yang; Zhu Jing; Li Shengli

doi:10.15980/j.tzzz.2012.06.009

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Effect of Homogenizing Heat Treatment on Microstructure and Hardness of AZ80-2.0Ca Magnesium Alloy
Vol. 32, Issue 6, Pages: 500-504(2012)
Published： 2012 ，
DOI： 10.15980/j.tzzz.2012.06.009

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[1]王忠军,徐阳,朱晶,李胜利.均匀化对AZ80-2.0Ca合金微观组织和硬度的影响[J].特种铸造及有色合金,2012,32(06):500-504.

Wang Zhongjun, Xu Yang, Zhu Jing, et al. Effect of Homogenizing Heat Treatment on Microstructure and Hardness of AZ80-2.0Ca Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 32(6):500-504(2012)
[1]王忠军,徐阳,朱晶,李胜利.均匀化对AZ80-2.0Ca合金微观组织和硬度的影响[J].特种铸造及有色合金,2012,32(06):500-504. DOI： 10.15980/j.tzzz.2012.06.009.

Wang Zhongjun, Xu Yang, Zhu Jing, et al. Effect of Homogenizing Heat Treatment on Microstructure and Hardness of AZ80-2.0Ca Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 32(6):500-504(2012) DOI： 10.15980/j.tzzz.2012.06.009.

摘要

采用DSC热分析仪、金相显微镜、扫描电镜和显微硬度计等研究了AZ80-2.0Ca铸造镁合金的微观组织

分析了均匀化热处理后合金的微观组织演变和显微硬度的变化规律。结果表明

该合金由基体α-Mg相

β-Mg17Al12相和（Mg

Al）2Ca相组成;Ca元素的加入使β-Mg17Al12相的熔点由437℃提高到457℃;在430℃下保温2h时β-Mg17Al12相完全溶解

继续延长保温时间至24h时

（Mg

Al）2Ca相未见溶解;当合金在515℃保温0.5h时

β-Mg17Al12相完全溶解

继续延长保温时间至4h时

（Mg

Al）2Ca相开始分解并转变为Al2Ca和Mg;合金共晶相分解后

其硬度开始下降

分解完成后其硬度趋于稳定

且515℃均匀化热处理后的合金硬度小于430℃均匀化热处理后的合金硬度。

Abstract

The microstructures of as-cast AZ80-2.0Ca magnesium alloy were investigated

and effects of homogenizing treatment on microstructure evolution and hardness change of the alloy were analyzed by DSC thermal analyzer

optical microscope（OM）

scanning electron microscopy（SEM） and micro-hardness tester.The results show that the as-cast AZ80-2.0Ca magnesium alloy is mainly composed of α-Mg phase

β-（Mg17Al12） phase and（Mg

Al）2Ca phase.The melting point of β-（Mg17Al12） phase in the alloy is increased from 437 ℃ to 457 ℃ with Ca addition.The β-（Mg17Al12） phase is completely dissolved at 430 ℃ for 2 h

however

the（Mg

Al）2Ca phase is not dissolved at 430 ℃ for 24 h.In addition

the β-（Mg17Al12） phase is completely dissolved at 515 ℃ for 0.5 h

and the（Mg

Al）2Ca phase is decomposed and transformed into Al2Ca phase and Mg at 515 ℃ for 4 h

and then the Mg atoms are diffused into the matrix.However

the Al2Ca phase is not dissolved even though for 24 h.Micro-hardness of the alloy is decreased with the solution of the β-（Mg17Al12） phase and（Mg

Al）2Ca phase and it tends to be constant after decomposition completion.However

the micro-hardness of the AZ80-2.0Ca magnesium alloy after homogenization treatment at 515℃ is lower than that at 430 ℃.