On the low cycle fatigue behaviour of an Al-Zn-Mg-Cu alloy processed via non-isothermal ageing  

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作  者:Guangyi Guo Guofu Xu Yuan Tang Zhihao Zhao Zhihao Yi Haoran Li Ruohan Wang Xiaoyan Peng 

机构地区:[1]School of Materials Science and Engineering,Central South University,Changsha 410083,China [2]Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education,Changsha 410083,China

出  处:《Journal of Materials Science & Technology》2024年第1期227-238,共12页材料科学技术(英文版)

基  金:supported by the State’s Key Project of Re-search and Development Plan(No.2021YFC1910505);the Key Research and Development Program of Guangdong Province(No.2020B010186002).

摘  要:The low cycle fatigue behaviour of an Al-Zn-Mg-Cu alloy processed via non-isothermal ageing(NIA)was examined at different strain amplitudes.We showed that NIA improved the low cycle fatigue life(more than 7000 cycles)by optimising the precipitate configuration within 5.5 h while maintaining comparable mechanical properties(570 MPa for tensile strength)and conductivity(nearly 39%IACS)to conventional isothermal ageing,simultaneously.Experimental observation combined with molecular dynamic simula-tion revealed that precipitation configuration manipulated by NIA had a crucial effect on fatigue resis-tance.A great number of repeatedly sheared and locally destructed GP zones enhanced co-planar slip and slip localisation in the under-aged alloy during the early stage of NIA,responsible for the dramatic displacement steps on the surface and resultant poor fatigue performance.As the NIA further proceeded,moderately coarsened precipitates with an average dimension of 6.0 nm and elevated number density ef-fectively impeded the dislocation movement and weaken the slip localisation to a great extent,improving the fatigue performance within a few hours.

关 键 词:Non-isothermal ageing Fatigue Al-Zn-Mg-Cu alloy Precipitate manipulation Slip localization 

分 类 号:TG1[金属学及工艺—金属学]

 

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