LI Chunzhi WANG Shuncai JIN Yan Institute of Aeronautical Materials
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Beijing
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Laboratory of Atomic Imaging of Solids
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Institute of Metal Research
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Academia Sinica
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Shenyang
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China
金属学报(英文版)
The dispersoid phase Al_(20)Cu_2Mn_3 in a 2024 Al alloy is commonly composed of twins,An ob- servation of corresponding high resolution image shows that the twin boundary plane is a glide plane other than mirror one.Two neighbouring components of twins are not symmetry of re- flection or rotation,but of glide reflection.The“diamond”glide plane is(101)and the glide vector is(1/4)(-).Components of twins in the phase take shape of prism with the longitudinal edge being parallel to[010]and side faces being{101}and{100}.
关键词:
twin
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null
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null
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null
孟凡生
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张卫文
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张大童
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杨超
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肖志瑜
中国有色金属学报
采用拉伸力学性能测试、宏观腐蚀、扫描电镜(SEM)、透射电镜(TEM)等,研究不同Zr含量对挤压铸造Al-5.0Cu-0.4Mn合金显微组织和力学性能的影响,并与重力铸造的合金的显微组织和力学性能进行对比分析.结果表明:针对铸态合金,无论是挤压铸造还是重力铸造,在Zr含量(质量分数)为0.25％时,合金获得最佳的抗拉强度、屈服强度和伸长率;而对于热处理态合金,当Zr含量从0增加到0.35％时,合金的抗拉强度和屈服强度都随着Zr含量的增加而增加,但伸长率在Zr含量为0.15％时达到最大值.挤压铸造可以显著改善不同Zr含量合金的伸长率,但对铸态合金伸长率的提升幅度明显优于热处理态合金的.Zr在铸态合金中的强化作用主要是细晶强化,而合金经T6热处理后,固溶强化以及Al3Zr粒子和θ'相的弥散强化是主要强化机制,挤压铸造可以显著改善Al3Zr粒子的弥散强化效果.
关键词:
Al-Cu-Mn合金
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挤压铸造
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力学性能
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显微组织
