陈康华1,2,3?覮,杨振1,3,焦慧彬1,3,陈送义1,3,陈善达2,3.最终形变热处理对Al-Zn-Mg-Cu 铝合金组织和性能的影响[J].湖南大学学报:自然科学版,2019,(6):24~30
最终形变热处理对Al-Zn-Mg-Cu 铝合金组织和性能的影响
Influence of Final Thermo-mechanical Treatment on Microstructures and Properties of Al-Zn-Mg-Cu Aluminium Alloy
  
DOI:
中文关键词:  Al-Zn-Mg-Cu铝合金  预变形  力学性能  抗腐蚀性能
英文关键词:Al-Zn-Mg-Cu aluminum alloy  pre-deformation  mechanical property  corrosion resistance
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作者单位
陈康华1,2,3?覮,杨振1,3,焦慧彬1,3,陈送义1,3,陈善达2,3 (1.中南大学 轻合金研究院湖南 长沙 410083 2.中南大学 轻质高强结构材料重点实验室湖南 长沙 410083 3.中南大学 有色金属先进结构材料与制造协同创新中心湖南 长沙 410083) 
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中文摘要:
      采用硬度与电导率测试、力学拉伸试验、晶间腐蚀、剥落腐蚀试验以及金相(OM)、扫描电镜(SEM)和透射电镜(TEM)等测试分析方法,研究了预变形量对Al-Zn-Mg-Cu铝合金组织与性能的影响. 研究表明:在相同预时效和再时效热处理条件下,随着预变形程度增大,合金强度先增加后减小,预变形量为5.8 %时,合金抗拉强度和屈服强度出现峰值,分别为577.8 MPa和549.8 MPa,较未预变形时分别提高了25.7 %和20.8 %;随着预变形量增大,合金抗腐蚀性能提高. 与未变形相比,预变形产生大量位错促使合金再时效热处理后晶内沉淀相尺寸逐渐增大,晶界析出相由连续链状分布变为粗大断续分布,晶间无析出带宽度明显增大.
英文摘要:
      The effect of pre-deformation amount on microstructure and properties of Al-Zn-Mg-Cu aluminum alloy was studied by hardness and electrical conductivity, tensile test, intergranular corrosion and exfoliation corrosion experiments, optical microscopy (OM),scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The results showed that the strength of the alloys with the increase of deformation amount first increased and then decreased under the same ageing heat treatment. The tensile strength and yield strength of the alloy with pre-deformation amount of 5.8% was 577.8 MPa and 549.8 MPa,respectively, which was increased by 25.7% and 20.8%,respectively,when compared with those without pre-deformation. The corrosion resistance was improved with the increase of pre-deformation. The precipitates became the larger discontinuous distribution grain boundary one and the width of the precipitate free zone became wider,which were attributed to the pre-deformation resulting in a large number of dislocation and benefit for precipitation under re-ageing.
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