Effects of Pre-aging on Microstructure and Mechanical Properties of Al-Zn-Mg Alloy

Zhang Shixing; Li Xiaohua; Zhang Xiao

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Effects of Pre-aging on Microstructure and Mechanical Properties of Al-Zn-Mg Alloy
Vol. 31, Issue 4, Pages: 298-300(2011)
Published： 2011 ，
DOI：

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[1]张世兴,李晓华,张晓.预时效对Al-Zn-Mg-Cu系铝合金组织及硬度的影响[J].特种铸造及有色合金,2011,31(04):298-300+393.

Zhang Shixing, Li Xiaohua, Zhang Xiao. Effects of Pre-aging on Microstructure and Mechanical Properties of Al-Zn-Mg Alloy. [J]. Special Casting & Nonferrous Alloys 31(4):298-300(2011)
[1]张世兴,李晓华,张晓.预时效对Al-Zn-Mg-Cu系铝合金组织及硬度的影响[J].特种铸造及有色合金,2011,31(04):298-300+393. DOI：

Zhang Shixing, Li Xiaohua, Zhang Xiao. Effects of Pre-aging on Microstructure and Mechanical Properties of Al-Zn-Mg Alloy. [J]. Special Casting & Nonferrous Alloys 31(4):298-300(2011) DOI：

摘要

研究了Al-Zn-Mg-Cu系铝合金形变热处理过程中时效制度变化对其组织和性能的影响。结果表明

预时效过程中适当地提高时效温度和延长时效保温时间

可以得到预时效的优化工艺参数;金相观察发现

预时效后合金再结晶明显细化

可观察到明显的析出相;预时效后随着形变量的增加

合金硬度随之增加

当形变量达到40%左右时合金硬度最高

随形变量增加

合金硬度略有下降;变形后的试样再进行终时效处理后

硬度提升不明显。

Abstract

Effects of pre-aging treatment on microstructure and properties of Al-Zn-Mg-Cu alloy during thermo-mechanical treatment process were investigated.The results show that optimized pre-aging parameters can be obtained with proper increasing in aging temperature and holding time.Recrystallizaion grain size can be greatly refined in pre-aged alloy in the presence of precipitates.Hardness of the pre-aged alloy is increased to maximum value with the increase of deformation rate to approximately 40%

and then it is slightly decreased with deformation rate more than 40%.Hardness increase of the deformed alloy after final aging treatment can be ignored.