Effects of Manganese on Grain Refinement in Mg-6Al Alloys

Wang Fei; Li Ke; Liao Jiannan; Zhan Meiqing; Wu Shangmin

doi:10.15980/j.tzzz.2013.11.010

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Effects of Manganese on Grain Refinement in Mg-6Al Alloys
Vol. 33, Issue 11, Pages: 1060-1063(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.11.010

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[1]王飞,李克,廖健南,詹美清,吴尚敏.Mn对Mg-6Al合金晶粒细化效果的影响[J].特种铸造及有色合金,2013,33(11):1060-1063.

Wang Fei, Li Ke, Liao Jiannan, et al. Effects of Manganese on Grain Refinement in Mg-6Al Alloys. [J]. Special Casting & Nonferrous Alloys 33(11):1060-1063(2013)
[1]王飞,李克,廖健南,詹美清,吴尚敏.Mn对Mg-6Al合金晶粒细化效果的影响[J].特种铸造及有色合金,2013,33(11):1060-1063. DOI： 10.15980/j.tzzz.2013.11.010.

Wang Fei, Li Ke, Liao Jiannan, et al. Effects of Manganese on Grain Refinement in Mg-6Al Alloys. [J]. Special Casting & Nonferrous Alloys 33(11):1060-1063(2013) DOI： 10.15980/j.tzzz.2013.11.010.

摘要

通过电弧法高温熔炼快速冷却制备出含τ-AlMn相的Mn-25Al中间合金。利用XRD、SEM、EDS等手段观察了镁合金显微组织形貌

探讨了Mn对Mg-6Al合金晶粒细化效果的影响。结果表明

相比添加MnCl2和变质剂的复合处理

Mn-25Al中间合金和MnCl2对Mg-6Al合金细化效果最为明显。Mn含量为0.3%时

细化效果最好

但进一步增加Mn含量时

细化效果不明显。通过错配度计算

发现τ-AlMn相可以成为有效形核核心

添加碳质变质剂之后

所形成的Al-C化合物易吸附于Al-Mn相上

形成形核能力较低的Al-C-Mn化合物

最终导致晶粒的粗化。

Abstract

The master alloy Mn-25Al containingτ-AlMn phase was prepared by vacuum quenching furnace.Meanwhile

effects of manganese on grain refinement in Mg-6Al alloys were analyzed by using XRD（X-ray diffraction）

SEM（scanning electron microscope）and EDS（energy dispersive spectrometer）

and so on.The results reveal that the refining effects of Mn-25Al master alloy and MnCl2are obviously superior to mixture containing MgCO3

C2Cl6and MnCl2.The best refining effects can be observed in magnesium alloy with addition of 0.3% Mn

however

the grain size is coarsened with further increasing in manganese content.τ-AlMn phase can be acted as desirable heterogeneous nuclei by analyzing the disregistry.Unfortunately

the Al-C compound which derived from carbon-containing modificator easily absorbed on the surface of Al-Mn phase and formed low-potency Al-C-Mn compound

resulting in the coarseness ofα-Mg grain.