预拉伸对2A12铝合金棒材组织和性能的影响  

Effect of pre-stretching on microstructure and mechanical properties of 2A12 aluminum alloy bar

作　　者：张克伟[1] 张磊[1] 张燕飞[1] 韩啸[1] 王志超[1] 祁艳华[1] 

机构地区：[1]东北轻合金有限责任公司,黑龙江哈尔滨150060

出　　处：《轻合金加工技术》2013年第11期37-40,共4页Light Alloy Fabrication Technology

摘　　要：采用拉伸试验、断口扫描及透射组织观察等方法,研究了2A12铝合金棒材170℃22 h时效前预拉伸对其组织及性能的影响。结果表明,预拉伸处理可以提高2A12铝合金棒材的强度,随着预拉伸变形量的增加,其屈服强度明显提高,伸长率逐渐降低;2A12铝合金的主要强化相是θ'相,预拉伸产生的位错促进θ'相的析出,因预拉伸量不同使位错的密度和分布发生变化,从而影响θ'相的析出状态,改变合金的力学性能。The effect of.pre-stretching on the microstructure and mechanical properties of 2A12 aluminum alloy before 22 h aging at 170℃ was researched by the tensile test, SEM and TEM. The results showed that pre-stretching could increase the tensile strength of 2A12 aluminum alloy bar. Yield strength increased obviously and elongation decreased gradually with the rising of the pre-stretching deformation. The main precipitated phase of 2A12 aluminum alloy was θ＇ phase. The dislocation owing to pre-stretching could promote the precipitation of θ＇ phase. Different distribution and density of the dislocation which was caused by different pre- stretching affected the θ＇ phase Status and the 0＇ phase affected the mechanical properties.

关 键 词：2A12铝合金棒材 预拉伸 组织 性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]