Effects of SiC Content on Refinement Efficiency and Morphology of AZ91D Magnesium Alloys

Chen Shengna; Cai Changchun; Yu Huan; Yang Wei; Xu Zhifeng; Yan Qingsong

doi:10.15980/j.tzzz.2013.10.028

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Effects of SiC Content on Refinement Efficiency and Morphology of AZ91D Magnesium Alloys
Vol. 33, Issue 10, Pages: 976-979(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.10.028

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[1]陈胜娜,蔡长春,余欢,杨伟,徐志锋,严青松.SiC含量对AZ91D镁合金细化效果及组织形貌的影响[J].特种铸造及有色合金,2013,33(10):976-979.

Chen Shengna, Cai Changchun, Yu Huan, et al. Effects of SiC Content on Refinement Efficiency and Morphology of AZ91D Magnesium Alloys. [J]. Special Casting & Nonferrous Alloys 33(10):976-979(2013)
[1]陈胜娜,蔡长春,余欢,杨伟,徐志锋,严青松.SiC含量对AZ91D镁合金细化效果及组织形貌的影响[J].特种铸造及有色合金,2013,33(10):976-979. DOI： 10.15980/j.tzzz.2013.10.028.

Chen Shengna, Cai Changchun, Yu Huan, et al. Effects of SiC Content on Refinement Efficiency and Morphology of AZ91D Magnesium Alloys. [J]. Special Casting & Nonferrous Alloys 33(10):976-979(2013) DOI： 10.15980/j.tzzz.2013.10.028.

摘要

采用真空感应熔炼与Ar气保护相结合

对不同SiC含量条件下AZ91D镁合金的晶粒细化效果及组织形貌演变进行了研究。结果表明

当熔体温度为700

20℃时

SiC颗粒的加入导致Mg2Si相的形成。随SiC含量的增加

Mg2Si含量不断提高

其形貌从汉字状向粗大鱼骨状和多边形转变。与此同时

β相变得细小、弥散。当SiC含量为0.2%时

由于未反应的SiC和反应产物相Al4C3在异质形核过程中充当了有效核心

AZ91D合金平均晶粒尺寸由铸态的480μm降至124μm

细化效果良好。

Abstract

Through using vacuum induction melting with the help of the protection of Ar atmosphere

effects of SiC content on the microstructure refinement and morphology transformation of AZ91D magnesium alloy were investigated.The results reveal that the addition of SiC particle can generate Mg2Si phase with the melting temperature in range of 700℃

20℃.With the increase of SiC content

the volume fraction of Mg2Si phase is increased and its morphology is changed from the linear-shaped Chinese script to coarse fish bone and polygonal structure.Meanwhile

theβphase becomes smaller and dispersed.Due to the existence of residual SiC particle and the Al4C3generated as nuclei with 0.2%SiC addition

heterogeneous nucleation is promoted

where grain size of the alloy is refined from 480μm to 124μm

obtaining desirable refining effects.