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    • 1460铝锂合金的力学性能与微观组织

    LI Jinfeng,CHEN Yonglai,ZHANG Xuhu,XU Xiuzhi,ZHENG Ziqiao

    Journal of Central South University（Science and Technology)（2017）

    Cited 8|Views7
    Abstract
    采用金相观察、拉伸性能测试及透射电镜分析等手段研究1460铝锂合金的铸态组织、薄板T6态单级时效(160℃)及T8态双级时效(5%预变形,130℃+160℃时效)处理时力学性能及微观组织的演化.研究结果表明:添加微量Sc元素时,凝固时形成Al3(Sc,Zr)初生相粒子,1460铝锂合金铸锭树枝晶组织被消除,晶粒呈等轴状,粒度较小(20~50μm);而冷轧薄板固溶处理后为细小的带状晶粒组织;1460铝锂合金主要时效析出强化相为δ′相(Al3Li),其次为T1相(Al2CuLi),但在时效过程中可能形成θ″(θ′)(Al2Cu)过渡相;在时效过程中,时效前期快速析出δ′相;随时效时间延长,δ′相长大,并析出θ″(θ′)过渡相;随着时效时间进一步延长,T1相析出,而θ″(θ′)过渡相消失;与T6态时效相比,T8态时效时T1相尺寸降低但密度增大,强度提高.
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    Key words
    Al-Li alloy,mechanical property,microstructure
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