Effects of Heat Treatment on Microstructure and Mechanical Properties of Die Casting Al-7Si-5.5Cu-0.4Mg Alloy

Liu Qing; Long Siyuan; Cai Congde; Wang Peng

doi:10.15980/j.tzzz.2016.09.015

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Effects of Heat Treatment on Microstructure and Mechanical Properties of Die Casting Al-7Si-5.5Cu-0.4Mg Alloy
Vol. 36, Issue 9, Pages: 954-957(2016)
Published： 2016 ，
DOI： 10.15980/j.tzzz.2016.09.015

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[1]刘青,龙思远,蔡聪德,王朋.热处理对压铸Al-7Si-5.5Cu-0.4Mg合金组织及硬度的影响[J].特种铸造及有色合金,2016,36(09):954-957.

Liu Qing, Long Siyuan, Cai Congde, et al. Effects of Heat Treatment on Microstructure and Mechanical Properties of Die Casting Al-7Si-5.5Cu-0.4Mg Alloy. [J]. Special Casting & Nonferrous Alloys 36(9):954-957(2016)
[1]刘青,龙思远,蔡聪德,王朋.热处理对压铸Al-7Si-5.5Cu-0.4Mg合金组织及硬度的影响[J].特种铸造及有色合金,2016,36(09):954-957. DOI： 10.15980/j.tzzz.2016.09.015.

Liu Qing, Long Siyuan, Cai Congde, et al. Effects of Heat Treatment on Microstructure and Mechanical Properties of Die Casting Al-7Si-5.5Cu-0.4Mg Alloy. [J]. Special Casting & Nonferrous Alloys 36(9):954-957(2016) DOI： 10.15980/j.tzzz.2016.09.015.

摘要

研究了T6热处理对压铸Al-7Si-5.5Cu-0.4Mg合金组织和力学性能的影响。结果表明

随着固溶时间延长

骨骼状Si相团簇由于第二相Al2Cu在基体中的溶解而逐渐被打断

到3h时Si颗粒已经演化成球状结构

分布也更为均匀。在0

h的时效过程中

合金硬度（HRE）先快速提高、随后缓慢提高

在3h时达到峰值74.5

随后硬度值基本保持稳定。热处理后

断口在宏观上表现为脆性断裂。

Abstract

The effects of T6 heat treatment on microstructure and mechanical properties of die casting Al-7Si-5.5Cu-0.4Mg alloy were investigated.The results demonstrate that the clusters of the skeleton Si particles are interrupted gradually to separate ones with the increase of solid solution treatment time as a result of the dissolution of the second phase Al2 Cu in the matrix.With solid solution treatment for 3h

the Si particles’ shape is transformed from irregular to spherical structure with a more uniform distribution.During aging times from 0to 6h

hardness of the alloy is increased dramatically and then reached gradually the peak value of 74.5 HRE at 3h.After that the hardness value keeps a dynamic balance

however fluctuates near slightly lower than the peak value after 4.5h.The fracture is characterized by brittle fracture in the macro-morphology.