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张景玉,许晓静.热机械处理对Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr铝合金固溶时效态组织及力学性能的影响[J].稀有金属材料与工程(英文),2017,46(10):3033~3037.[zhangjingyu and xuxiaojing.Effect of Thermomechanical Treatment on Microstructure and Mechanical Property of Solution-aged Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr Aluminum Alloy[J].Rare Metal Materials and Engineering,2017,46(10):3033~3037.]
Effect of Thermomechanical Treatment on Microstructure and Mechanical Property of Solution-aged Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr Aluminum Alloy
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Received:June 12, 2015  Revised:December 02, 2015
DOI:
Key words: Al-Zn-Mg-Cu alloy  thermomechanical treatment  microstructure  mechanical property  dislocation strengthening
Foundation item:国家自然科学基金项目(51074079)
Author NameAffiliation
zhangjingyu and xuxiaojing  
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Abstract:
      The subjects of this paper is ultra-high strength aluminum alloy Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr, which was involved in the process of solution - aging and thermomechanical treatment(solution-overaging-hot compression) - solution - aging. Electron back scattering diffractions (EBSD) technology, X-ray diffraction (XRD) and tensile testing were respectively used on its study of distribution of grain and grain boundaries, internal dislocation density and tensile properties, and dislocation strengthening and grain boundary strengthening are calculated quantitatively. The results show that TMT refines grain with average grain size reducing from 7.30 μm to 6.04 μm and misorientation angle reducing from 21.45 to 21.04 . TMT increases peak aging hardness from 214.6 HV(120℃×48h) to 226.8 HV(100℃×48h), but has little effect on strength with yield strength are both almost 600 MPa. The tensile fracture morphology of alloys both?display intergranular and tear fracture. Dislocation density of alloys processed by solution and TMT - solution are both 0, and TMT reduces sum of dislocation strengthening and grain boundary strengthening from 58.8 MPa to 57.4 MPa.
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