挤压铸造对A356.2合金微观组织和力学性能的影响

张瑞忠; 钟鼓; 邱楚; 张保存; 长海博文; 文成

doi:10.15980/j.tzzz.2018.06.007

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挤压铸造对A356.2合金微观组织和力学性能的影响
Effects of Squeeze Casting on Microstructures and Mechanical Properties of A356.2 Aluminum Alloy
2018年38卷第6期页码：604-608
纸质出版日期： 2018 ，
DOI： 10.15980/j.tzzz.2018.06.007

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[1]张瑞忠,钟鼓,邱楚,张保存,长海博文,文成.挤压铸造对A356.2合金微观组织和力学性能的影响[J].特种铸造及有色合金,2018,38(06):604-608.

Zhang Ruizhong, Zhong Gu, Qiu Chu, et al. Effects of Squeeze Casting on Microstructures and Mechanical Properties of A356.2 Aluminum Alloy[J]. Special Casting & Nonferrous Alloys, 2018,38(6):604-608.
[1]张瑞忠,钟鼓,邱楚,张保存,长海博文,文成.挤压铸造对A356.2合金微观组织和力学性能的影响[J].特种铸造及有色合金,2018,38(06):604-608. DOI： 10.15980/j.tzzz.2018.06.007.

Zhang Ruizhong, Zhong Gu, Qiu Chu, et al. Effects of Squeeze Casting on Microstructures and Mechanical Properties of A356.2 Aluminum Alloy[J]. Special Casting & Nonferrous Alloys, 2018,38(6):604-608. DOI： 10.15980/j.tzzz.2018.06.007.

摘要

通过分析比较不同热处理条件下挤压铸造A356.2合金组织中气孔数量、共晶Si尺寸和形貌以及第二相尺寸的变化

研究了析出相和组织缺陷对合金力学性能的影响。结果表明

伸长率的大小主要与气孔率和共晶Si的球化效果有关

气孔率越低、共晶Si形状系数越大

则合金的伸长率越高

其中合金的气孔率占主导因素

而屈服强度和抗拉强度的大小主要与Mg2Si强化相的析出尺寸有关

尺寸越大则强化效果越差。

Abstract

The effects of squeeze casting on microstructure and mechanical properties of the A356.2 alloy were investigated by observing the number of pores

the size and morphology of eutectic silicon particles and evolution of second phases under different heat treatment conditions.The results show that elongation of the alloy is mainly related to the porosity and the spheroidizing effect of eutectic silicon particles.With the decrease of the porosity and the increase of shape factor of the eutectic silicon particles

the elongation is increased

in which the porosity of the alloy is the dominant factor.The yield strength and the tensile strength of the A356.2 alloy are mainly related to the size of Mg2 Si phase

and the strengthening effect is weakened when the size of Mg2 Si phase is increased.