Thermal Expansion Properties of Mg-Si Binary Alloy and Influence of Ca Addition

Guo Tian; Zhou Xiong; Wu Shusen; Yang Xiong; LüShulin; Li Jianyu

doi:10.15980/j.tzzz.2019.06.028

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Thermal Expansion Properties of Mg-Si Binary Alloy and Influence of Ca Addition
Vol. 39, Issue 6, Pages: 687-691(2019)
Published： 2019 ，
DOI： 10.15980/j.tzzz.2019.06.028

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[1]郭田,周雄,吴树森,杨雄,吕书林,李建宇.Mg-Si二元合金热膨胀性能及Ca添加影响的研究[J].特种铸造及有色合金,2019,39(06):687-691.

Guo Tian, Zhou Xiong, Wu Shusen, et al. Thermal Expansion Properties of Mg-Si Binary Alloy and Influence of Ca Addition. [J]. Special Casting & Nonferrous Alloys 39(6):687-691(2019)
[1]郭田,周雄,吴树森,杨雄,吕书林,李建宇.Mg-Si二元合金热膨胀性能及Ca添加影响的研究[J].特种铸造及有色合金,2019,39(06):687-691. DOI： 10.15980/j.tzzz.2019.06.028.

Guo Tian, Zhou Xiong, Wu Shusen, et al. Thermal Expansion Properties of Mg-Si Binary Alloy and Influence of Ca Addition. [J]. Special Casting & Nonferrous Alloys 39(6):687-691(2019) DOI： 10.15980/j.tzzz.2019.06.028.

摘要

研究了Mg-xSi（x=1、2、3、4

质量分数）二元合金以及添加合金元素Ca的Mg-4Si-yCa（y=0、0.2、0.4、0.6、0.8、1.0）合金的热膨胀性能。结果表明

随着Si含量增加

Mg-Si合金热膨胀系数逐渐下降。当Si含量为4%时

室温（RT）至100℃的平均热膨胀系数由2.600×10

-5

/℃下降至1.798×10

-5

/℃;随着Ca含量增加

Mg-Si-Ca合金中初生Mg

Si相的形态由树枝状晶转变为规则多面体

平均尺寸先减小后增加

合金的热膨胀系数先增加后逐渐下降。

Abstract

The thermal expansion properties of Mg-xSi（x=1、2、3、4）binary alloy and Mg-4 Si-yCa（y=0、0.2、0.4、0.6、0.8、1.0）alloy were measured and anlyzed.The results reveal that the coefficient of thermal expansion（CTE）is decreased with the increase of Si content.When Si content is 4%

the average CTE is decreased from2.600×10

-5

/℃to 1.798×10

-5

/℃ between room temperature（RT）and 100℃.With the increase of Ca content

the morphology of primary Mg

Si in Mg-Si-Ca alloy is transformed from dendrite to regular polyhedron.The average size of primary Mg

Si is decreased firstly and then increased

and the CTE of Mg-Si-Ca alloy is increased and then decreased gradually.