预变形对Al-Cu-Mn-Mg-Ag合金的组织与力学性能的影响  

Effect of Predeformation on Microstructures and Mechanical Properties of Al-Cu-Mn-Mg-Ag Aluminum Alloy

作　　者：李慧中[1,2] 李洲[2] 梁霄鹏[1,2] 郭菲菲[2] 孙风蔚[2] 

机构地区：[1]湖南涉外经济学院机械工程学部,长沙410205 [2]中南大学材料科学与工程学院,长沙410083

出　　处：《航空材料学报》2009年第2期29-33,共5页Journal of Aeronautical Materials

基　　金：国家“973”重点基础研究发展规划项目(2005CB623706);中南大学博士后基金(2007-8);中国博士后基金(20070420828)

摘　　要：采用显微硬度测试、拉伸力学性能测试、扫描电镜及透射电镜观察等分析手段，研究了预变形对Al-Cu-Mn-Mg-Ag合金的组织与力学性能的影响。结果表明：时效前的冷轧变形加速了Al-Cu-Mn-Mg-Ag合金的时效进程，提高了时效的峰值硬度，促进Ω相的析出，增加Ω相的数量。随着变形量的增加，合金时效过程中双阶段时效硬化的现象减弱，预变形小于10％时，时效过程中出现明显的双阶段时效硬化特征，预变形大于10％时，时效过程仅出现明显的单阶段时效硬化特征；随着预变形量的增加，合金的抗拉强度和屈服强度逐渐增加，延伸率逐渐降低。综合考虑合金的强度和塑性，Al-Cu-Mn-Mg-Ag合金的预变形量应为10％～20％。The effect of predeformation on the microstructures and mechanical properties of Al-Cu-Mn-Mg-Ag aluminum alloy were in-vestigated by means of microhardness test, tensile test, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The results show that the cold roll deformation of Al-Cu-Mn-Mg-Ag aluminum alloy accelerates the ageing process, increases the peak hardness,promotes the Ω phase precipitation and increases the number of Ω phase. The double-stage hardening character is weak with increasing predeformation amount during the ageing process. When the amount of predeformation is less than 10% , there＇ is apparent double-stage hardening character. However simple hardening character appears as the amount of predeformation higher than 10%. The tensile strength and yield strength of alloy are gradually increased, but the plasticity is decreased with increasing pre-de- formation amount. The predeformation of 10% - 20% for Al-Cu-Mn-Mg-Ag aluminum alloy is better according its strength and plasticity.

关 键 词：Al-Cu-Mn-Mg-Ag合金 预变形 显微组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]