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首页> 外文会议>2006 BIMW >Effect of Minor Sc and Zr on the Fatigue Properties of Al-Mg-Mn Alloy
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Effect of Minor Sc and Zr on the Fatigue Properties of Al-Mg-Mn Alloy

机译：微量Sc和Zr对Al-Mg-Mn合金疲劳性能的影响

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摘要

The effect of Sc and Zr on the fatigue property of Al-6.2Mg-0.4Mn alloy was investigated by control experiment; the fatigue lives of Al-6.2Mg-0.4Mn alloy with and without Sc and Zr at different loading stress amplitudes were measured. The relationships between their fatigue properties and microstructures were studied by means of optical microscope, scanning electronic microscope and transmission electron microscope. The addition of Sc and Zr improved the fatigue lives and fatigue strength of Al-6.2Mg-0.4Mn alloy. It is difficult for crack to initiate and propagate in the Al-6.2Mg-0.4Mn-Sc-Zr alloy. The fine and pancake-like grains of this alloy lead to the increase of fatigue life and fatigue strength. The high densities of dislocation and grain boundary in the Al-6.2Mg-0.4Mn-Sc-Zr alloy can prevent microcrack from propagating effectively. Additionally the dispersion precipitation of Al_3Sc and Al_3(Sc_(1-x)Zr_x) particles enhance the toughness of Al-6.2Mg-0.4Mn-Sc-Zr alloy.
机译：通过控制实验研究了Sc和Zr对Al-6.2Mg-0.4Mn合金疲劳性能的影响。在不同的加载应力幅度下，测量了含和不含Sc和Zr的Al-6.2Mg-0.4Mn合金的疲劳寿命。通过光学显微镜，扫描电子显微镜和透射电子显微镜研究了它们的疲劳性能与显微组织之间的关系。 Sc和Zr的添加改善了Al-6.2Mg-0.4Mn合金的疲劳寿命和疲劳强度。 Al-6.2Mg-0.4Mn-Sc-Zr合金中裂纹难以萌生和扩展。这种合金的细小和薄饼状的晶粒导致疲劳寿命和疲劳强度的增加。 Al-6.2Mg-0.4Mn-Sc-Zr合金中的高位错密度和晶界可以有效地防止微裂纹的扩展。另外，Al_3Sc和Al_3（Sc_（1-x）Zr_x）颗粒的分散沉淀提高了Al-6.2Mg-0.4Mn-Sc-Zr合金的韧性。

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