热处理对混合稀土变质A356合金组织及力学性能的影响

姜峰; 索忠源; 关鲜洪; 王毅坚

doi:10.15980/j.tzzz.2020.12.022

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热处理对混合稀土变质A356合金组织及力学性能的影响
Effects of Heat Treatment on Microstructure and Mechanical Properties of A356Alloy Modified by Mixed Rare Earth
2020年40卷第12期页码：1414-1417
纸质出版日期： 2020 ，
DOI： 10.15980/j.tzzz.2020.12.022

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[1]姜峰,索忠源,关鲜洪,王毅坚.热处理对混合稀土变质A356合金组织及力学性能的影响[J].特种铸造及有色合金,2020,40(12):1414-1417.

Jiang Feng, Suo Zhongyuan, Guan Xianhong, et al. Effects of Heat Treatment on Microstructure and Mechanical Properties of A356Alloy Modified by Mixed Rare Earth[J]. Special Casting & Nonferrous Alloys, 2020,40(12):1414-1417.
[1]姜峰,索忠源,关鲜洪,王毅坚.热处理对混合稀土变质A356合金组织及力学性能的影响[J].特种铸造及有色合金,2020,40(12):1414-1417. DOI： 10.15980/j.tzzz.2020.12.022.

Jiang Feng, Suo Zhongyuan, Guan Xianhong, et al. Effects of Heat Treatment on Microstructure and Mechanical Properties of A356Alloy Modified by Mixed Rare Earth[J]. Special Casting & Nonferrous Alloys, 2020,40(12):1414-1417. DOI： 10.15980/j.tzzz.2020.12.022.

摘要

研究了热处理对混合稀土变质A356合金组织及力学性能的影响。结果表明

A356合金经0.5%的混合稀土变质与T6处理后

合金中的共晶Si全部转变成近球形颗粒组织。合金的硬度（HBW）、抗拉强度均达到最大值

分别为98.3和303.5 MPa

此时合金的伸长率为7.32%

与0.5%的混合稀土变质未热处理的合金相比

分别提高了64.93%、32.88%和10.91%。合金的断裂形式为韧性断裂

其综合力学性能得到显著提高。

Abstract

The effects of heat treatment on microstructure and mechanical properties of A356 alloy modified by mixed rare-earth were investigated.The results reveal that the eutectic silicon in A356 alloy is all transformed into nearly spherical granular structure with 0.5% mixed rare-earth modification and T6 treatment.Both the Brinell hardness and tensile strength of the alloy reach the maximum values

which are 98.3 HBW and 303.5 MPa

respectively.Meanwhile

the elongation of the alloy is 7.32%.Compared with those of the alloy modified with 0.5%mixed rare-earth without heat treatment

mechanical properties are increased by 64.93%

32.88% and 10.91%

respectively.The fracture of the alloy is characterized by ductile fracture

and comprehensive mechanical properties are enhanced significantly.