T6I6处理对Al-Si-Mg-Cu铸铝时效析出及疲劳行为的影响  

Effects of T6I6 Treatment on the Precipitation and Fatigue Behaviour of Al-Si-Mg-Cu Cast Aluminum Alloy

作　　者：陈宇强[1] 张文涛 张浩[1] 潘素平 李运湘 李宁波 欧陈贵 伏明珠 阳铭广 CHEN Yuqiang;ZHANG Wentao;ZHANG Hao;PAN Suping;LI Yunxiang;LI Ningbo;OU Chengui;FU Mingzhu;YANG Mingguang(Key Laboratory of High Temperature Wear Resistant Materials Preparation Technology of Hunan Province,Hunan University of Science and Technology,Xiangtan 411201,China;Advanced Research Center,Central South University,Changsha 410083,China;Hunan Runtai New Energy Science and Technology Ltd.,Xiangxiang 411400,China)

机构地区：[1]湖南科技大学,高温耐磨材料及制备技术湖南省国防技术重点实验室,湘潭411201 [2]中南大学高等研究中心,长沙410083 [3]湖南润泰新能源科技有限公司,湘乡411400

出　　处：《材料导报》2020年第14期14122-14128,共7页Materials Reports

基　　金：国家自然科学基金(51405153;51875197)。

摘　　要：利用硬度测试、力学拉伸测试、疲劳测试和透射电镜分析(TEM)等方法研究了T6I6处理对Al-Si-Mg-Cu铸铝时效析出和疲劳行为的影响。研究结果表明:在T6和T6I6峰时效阶段,Al-Si-Mg-Cu铸造铝合金的主要强化相为GP区和β″相,T6I6处理能够明显提高峰时效态合金强化相的密度。与T6峰时效态合金相比,T6I6峰时效态合金的屈服强度和抗拉强度分别提高了7.3 MPa和11.5 MPa,同时延伸率也提高了4.1%。相同加载条件下,T6I6峰时效态合金的疲劳寿命更长,在最大应力为175 MPa时,疲劳寿命提高了63.0%。The effects of T6I6 treatment on the precipitation and fatigue behaviour of Al-Si-Mg-Cu cast aluminum alloy were investigated by using hardness test,mechanical tensile test,fatigue test and transmission electron microscopy(TEM).The results show that the main strengthening-phases of the T6 peak-aged and T6I6 peak-aged alloy were GP zone andβ″precipitates.Compared with T6 peak-aged alloy,the yield strength and tensile strength of the T6I6 peak-aged alloy increased by 7.3 MPa and 11.5 MPa,respectively,and its elongation also increased by 4.1%.In addition,under the same loading condition,the T6I6 peak-aged alloy exhibited a longer fatigue life.At the maximum stress of 175 MPa,the fatigue life of the T6I6 peak-aged alloy was enhanced by 63.0%compared with that of T6 peak-aged alloy.

关 键 词：Al-Si-Mg-Cu铸铝 T6I6时效处理 微观组织 疲劳行为 

分 类 号：TG146.2[一般工业技术—材料科学与工程]