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首页> 外文会议>2006 BIMW >Effect of Trace Element Er on Al-Mg and Al-Mg-Mn Alloys
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Effect of Trace Element Er on Al-Mg and Al-Mg-Mn Alloys

机译：微量元素Er对Al-Mg和Al-Mg-Mn合金的影响

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The behaviors of trace element Er on binary Al-Mg and ternary Al-Mg-Mn alloys have been investigated through optical microscopy, x-ray diffraction, scanning electron microscopy with energy dispersive spectroscopy and transmission electron microscope. It was found that Er additions more than 0.4% (wt%) produced a remarkable refinement in grain size of Al-Mg and Al-Mg-Mn alloys castings. Er can enhance the tensile strength of the two group experimental alloys significantly but not greatly decrease the elongation due to the formation of many fine like spherical and dispersive primary and precipitation Al_3Er particles during casting and heating process. Al_3Er particles have Ll_2 crystal structure (space group Pm3m) with a lattice parameter of 0.42119nm, and have a coherent relationship with the matrix phase α-Al (mismatch only 4.1%), which can be acted as the heterogeneous nucleus during solidification to increase the rate of nucleation, and the other hands it can strongly pin up dislocations and subgrain boundaries and retard the recrystallization of alloys.
机译：通过光学显微镜，X射线衍射，扫描电子显微镜，能量色散光谱和透射电子显微镜研究了微量元素Er在二元Al-Mg和三元Al-Mg-Mn合金上的行为。已发现，Er添加量超过0.4％（wt％）可以显着改善Al-Mg和Al-Mg-Mn合金铸件的晶粒尺寸。 Er可以显着提高两组实验合金的抗拉强度，但由于在铸造和加热过程中会形成许多细小的球状和弥散性的初生Al_3Er沉淀颗粒，因此不会显着降低延伸率。 Al_3Er颗粒具有Ll_2晶体结构（空间群Pm3m），晶格参数为0.42119nm，并且与基体相α-Al（失配率仅为4.1％）具有相干关系，可以作为凝固过程中的异质核而增加另一方面，它可以强烈地阻止位错和亚晶界并阻碍合金的再结晶。

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