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对Mg-Al合金晶粒细化的研究进展进行了综述。在理论研究方面,边-边匹配模型(E2EM)成功用于预测镁合金的异质形核颗粒,相互依存理论清晰的表述了镁合金晶粒的形核与长大过程,合金平均晶粒尺寸由无形核区大小和异质形核颗粒平均间距共同决定;在实验研究方面,高纯Mg-Al合金的天然形核机制来源于Al-C相的异质形核作用,而Mg-Al合金中含有Fe和Mn元素时,Al-C相的异质形核作用被破坏,Al-Fe-Mn三元相取代Al-C相起到异质形核作用。对比了Mg-Al合金不同细化方式的优缺点,指出过热处理和C细化方法是目前Mg-Al合金最有效的细化方法,并对今后Mg-Al合金晶粒细化研究的方向进行了展望。
The research progress of grain refinement of Mg-Al alloy is reviewed. In theory, the edge-edge matching model (E2EM) has been successfully used to predict the heterogeneous nucleation particles of magnesium alloys. The interdependence theory clearly expresses the nucleation and growth of magnesium alloy grains, the average grain size Which is determined by the size of the invisible nuclear zone and the average spacing of the heterogeneous nucleation particles. In the experimental research, the natural nucleation mechanism of the high purity Mg-Al alloy comes from the heterogeneous nucleation of the Al-C phase, while the Mg-Al alloy Contains Fe and Mn elements, the heterogeneous nucleation of the Al-C phase is destroyed, and Al-Fe-Mn ternary phase replaces the Al-C phase to form heterogeneous nucleation. The advantages and disadvantages of different refinement methods of Mg-Al alloy are compared. It is pointed out that superheat treatment and C refining method are the most effective methods for refining Mg-Al alloys at present, and the direction of grain refinement research for Mg-Al alloys Looking forward.