Effects of RE Content and Ageing on Microstructure and Mechanical Properties of Al-Mg-Si Alloys

He Suxia1; Liu Zhongxia1

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Effects of RE Content and Ageing on Microstructure and Mechanical Properties of Al-Mg-Si Alloys
Vol. 30, Issue 6, Pages: 566-569(2010)
Published： 2010 ，
DOI：

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[1]贺素霞,刘忠侠.RE及时效工艺对Al-Mg-Si合金组织和性能的影响[J].特种铸造及有色合金,2010,30(06):566-569+597.

He Suxia1, Liu Zhongxia1. Effects of RE Content and Ageing on Microstructure and Mechanical Properties of Al-Mg-Si Alloys. [J]. Special Casting & Nonferrous Alloys 30(6):566-569(2010)
[1]贺素霞,刘忠侠.RE及时效工艺对Al-Mg-Si合金组织和性能的影响[J].特种铸造及有色合金,2010,30(06):566-569+597. DOI：

He Suxia1, Liu Zhongxia1. Effects of RE Content and Ageing on Microstructure and Mechanical Properties of Al-Mg-Si Alloys. [J]. Special Casting & Nonferrous Alloys 30(6):566-569(2010) DOI：

摘要

研究了铝合金中RE含量及热处理工艺对Al-Mg-Si合金板材的显微组织、力学性能的影响。研究表明

添加一定量的RE可以明显改善板材的力学性能

在T4P+烘烤状态下

RE含量为0.2%的合金具有最高的强度

屈服强度达到281MPa

比不含RE的合金高出约40MPa;抗拉强度达到373MPa。表明加入0.2%的RE后合金的强度和塑性都有很大的提高。对于RE含量为0.2%的合金

T4+烘烤条件下

虽然板材伸长率较高

但板材的屈服强度和抗拉强度分别较T6态低120MPa和40MPa;T4P+烘烤处理后

组织中出现了细密的析出相

抗拉强度非常接近于T6态

伸长率较T6态提高了4%

表明预时效处理后更能发挥RE对合金性能的有益作用。

Abstract

Effects of RE content and heat treatment on microstructure and mechanical properties of Al-Mg-Si plate were investigated. The results reveal that mechanical properties of the plate sheet are improved with 0.2% RE addition in condition of T4 preageing and baking

where yield strength and tensile strength reach up to 281 MPa and 373 MPa

respectively

compared with those of ones without RE addition

increased by approximately 40 MPa and 30 MPa

respectively

showing improvement of strength and plasticity of the alloy with 0.2% RE addition. Although the alloy with 0.2% RE addition exhibits a higher elongation

yield strength and tensile strength is lower about 120 MPa and 40 MPa than those of T6 treated alloy in condition of T4 via baking. Fine and compact precipitates can be observed in the alloy after T4 preageing via baking

which results in the equivalent T6 treated alloy in tensile strength and the increase of 4% in elongation. The results show that the RE elernent play more positive role in improving properties of the alloy after preageing.