摘要
合理的回归再时效处理(RRA)能改善A1-Zn-Mg-Cu合金抗晶间腐蚀能力,提高合金的综合性能。本文通过显微硬度和电导率测试、室温拉伸与晶间腐蚀等方法,分别研究了175、185、195℃回归及120℃×24 h再时效处理的7150铝合金微观组织和性能。结果表明,随回归时间和温度变化,RRA态7150铝合金硬度有峰值,在175、185和195℃回归的RRA态7150合金硬度分别经50、30和27 min回归时间达硬度峰值203 HV、198 HV、197 HV;电导率随回归温度升高、时间延长而持续增大;回归再时效7150铝合金按抗晶间腐蚀能力强弱195℃×1 h> 185℃×1 h> 175℃×1 h,按强度高低175℃×1 h> 185℃×1 h> 195℃×1 h。综合比较,120℃×24 h+185℃×1 h+120℃×24 h处理的7150铝合金综合性能好,是最佳的回归再时效处理工艺。
Reasonable retrogression and re-ageing(RRA)treatment can improve the intergranular corrosion resistance and the comprehensive properties of Al-Zn-Mg-Cu alloy.In this paper,the microstructure and properties of 7150 aluminum alloy treated by 175,185 and 195℃retrogression and 120℃×24 h re-aging were studied by means of microhardness and conductivity test,room-temperature tensile test and intergranular corrosion test.The results show that when retrogression treated at 175,185 and 195℃for 50,30 and 27 min respectively,the hardness of RRA treated 7150 aluminum alloy has peak values of 203 HV,198 HV and 197 HV.The conductivity increases continuously with the increase of retrogression temperature and time.The order of the strength of RRA treated 7150 aluminum alloy is that 175℃×1 h>185℃×1 h>195℃×1 h,while the order of the intergranular corrosion resistance is opposite.By comprehensively comparison,the treatment of 120℃×24 h+185℃×1 h+120℃×24 h provides the 7150 aluminum alloy better comprehensive properties and is the best RRA process.
作者
蒋爱娟
祝贞凤
梁晓宁
高千林
Jiang Aijuan;Zhu Zhenfeng;Liang Xiaoning;Gao Qianlin(Department of Engineering Materials,Yantai Nanshan University,Longkou Shandong 265713,China;Shandong Nanshan aluminum Co.,Ltd.,Longkou Shandong 265713,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2019年第9期134-139,共6页
Heat Treatment of Metals
基金
龙口市科技研发项目(2017GG23)
烟台重点研发项目(2017ZH081)
