中文摘要：

作为最轻的结构的金属， Mg 和基于 Mg 的合金在太空有大潜在的应用，汽车、原子的工业。然而，如此的应用被低韧性和力量限制了。理论上，小谷物同时地缩放结构罐头改进它的韧性和力量。然而，为镁合金的普遍可靠的谷物精炼技术仍然在调查下面，一些在强壮的辩论。这篇论文为镁合金论述谷物精炼方法的开发的简短评论，它将贡献控制谷物精炼的因素的更好的理解并且在这个领域里提供未来研究的眼界。

英文摘要：

As the lightest structural metal, Mg and Mg-based alloys have great potential applications in the aerospace, automotive and nuclear industries. However, such applications have been limited by low ductility and strength. Theoretically, small grain sized structure can synchronously improve its ductility and strength. Yet, universally reliable grain refinement techniques for the magnesium alloys are still under investigation and some are in strong debating. This paper presents a brief review of development of grain refinement methods for magnesium alloys, which would contribute to a better understanding of the factors controlling grain refinement and provide an outlook of future research in this field.