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,2017,46(10):3033~3037.[zhangjingyu,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.]
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
投稿时间:2015-06-12  修订日期:2015-12-02
中文关键词:  Al-Zn-Mg-Cu合金  热机械处理  组织,力学性能  位错强化
基金项目:国家自然科学基金项目(51074079)
中文摘要:
      摘 要:本文的实验对象为固溶-时效和热机械处理(固溶-过时效-热压缩)-固溶-时效加工的超高强铝合金Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr,分别采用电子背散射衍射分析(EBSD)、X射线衍射分析(XRD)、硬度测试和拉伸试验研究合金组织晶粒晶界特征分布、内部的位错密度和力学性能,并定量计算位错强化和晶界强化值。结果表明:热机械处理对合金晶粒细化影响不是非常显著,平均晶粒尺寸从7.30 μm减小至6.04 μm,晶界角度从21.45 下降到21.04 ,小角度晶界比例从0.588下降到0.546;TMT使峰时效硬度从214.6 HV(120℃×48h)提高到226.8 HV(100℃×48h),但对强度影响较小,二者屈服强度均为600 MPa左右,拉伸断口均为沿晶和撕裂混合断裂。合金分别经固溶及TMT-固溶后,晶界位错密度均为零,TMT使位错强化与晶界强化的总强化从58.8 MPa下降到57.4 MPa。
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
英文关键词:Al-Zn-Mg-Cu alloy  thermomechanical treatment  microstructure  mechanical property  dislocation strengthening
英文摘要:
      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.
作者单位E-mail
张景玉 江苏大学机械工程学院 2763295690@qq.com 
许晓静 江苏大学机械工程学院 xjxu67@126.com 
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