Effect of Ca on the Hot Tearing Susceptibility of Mg-7Al-2Si Casting Alloys

Qiu Keqiang; Tao Siwei; Re Yan; You Junhua; Ren Yinglei; Li Rongde

doi:10.15980/j.tzzz.2013.02.019

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Effect of Ca on the Hot Tearing Susceptibility of Mg-7Al-2Si Casting Alloys
Vol. 33, Issue 2, Pages: 186-190(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.02.019

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[1]邱克强,陶思伟,热焱,尤俊华,任英磊,李荣德.Ca对Mg-7Al-2Si合金热裂倾向的影响[J].特种铸造及有色合金,2013,33(02):186-190.

Qiu Keqiang, Tao Siwei, Re Yan, et al. Effect of Ca on the Hot Tearing Susceptibility of Mg-7Al-2Si Casting Alloys. [J]. Special Casting & Nonferrous Alloys 33(2):186-190(2013)
[1]邱克强,陶思伟,热焱,尤俊华,任英磊,李荣德.Ca对Mg-7Al-2Si合金热裂倾向的影响[J].特种铸造及有色合金,2013,33(02):186-190. DOI： 10.15980/j.tzzz.2013.02.019.

Qiu Keqiang, Tao Siwei, Re Yan, et al. Effect of Ca on the Hot Tearing Susceptibility of Mg-7Al-2Si Casting Alloys. [J]. Special Casting & Nonferrous Alloys 33(2):186-190(2013) DOI： 10.15980/j.tzzz.2013.02.019.

摘要

研究了Ca对Mg-7Al-2Si-0.8Zn-0.5Sr-0.4Mn铸造合金热裂倾向的影响。利用等长度金属型制备了热裂试样

采用热裂棒临界直径尺寸和热裂敏感系数评价合金的热裂倾向。借助光学显微镜

扫描电镜（SEM）和能谱仪（EDX）综合分析镁合金的热裂行为。结果表明

Ca的添加细化了合金的显微组织;当Ca含量为3.0%时

热裂棒临界直径尺寸和热裂敏感系数均最低

α-Mg枝晶的断裂面积为0

共晶相的断裂面积为100%。在裂纹形成过程中

共晶相具有向裂纹富集的趋势

形成了可以填充裂纹缝隙的能力

使合金的热裂倾向降低。当合金的热裂倾向较低时

对应较高的抗拉强度。

Abstract

Effects of Ca addition on the hot tearing susceptibility of Mg-7Al-2Si-0.8Zn-0.5Sr-0.4Mn casting alloys were investigated.The hot crack samples were prepared by metal molds with the same length.Hot tearing susceptibility was evaluated using crack-rod critical diameter and hot tearing sensitive coefficient.The hot tearing behavior of constituent phase of the alloys were analyzed with the help of optical microscopy（OM）

scanning electron microscopy（SEM）and the detector of energy dispersive（EDX）.The results show that the microstructure of the alloys is refined with Ca addition.With 3.0% Ca addition

both the crack-rod critical diameter and hot tearing sensitive coefficient exhibit the minimum value

and fractured areas ofα-Mg dendrite and eutectic are zero and 100%

respectively.Furthermore

the eutectic phase is tended to enrich at the cracks

which establishes the ability to fill the cracks

decreasing the hot tearing susceptibility of alloy.The lower hot tearing susceptibility of the alloy is corresponding to the higher tensile strength.