In response to the urgent demand for lightweight, magnesium (Mg) alloys have garnered considerable attention owing to their low density. Nonetheless, the intrinsic poor room-temperature formability of Mg alloys remains a major obstacle in shaping precise complex components, necessitating the development of superplastic Mg alloys. Excellent superplasticity is usually acquired in high-alloyed Mg alloys with enhanced microstructural thermal stability facilitated by abundant optimized second-phase particles. While for cost-effective low-alloyed Mg alloys lacking particles, regulating solute segregation has emerged as a promising approach to achieve superplasticity recently. Moreover, the potential of bimodal-grained Mg alloys for superplastic deformation has been revealed, expanding the options for designing superplastic materials beyond the conventional approach of fine-grained microstructures. This study reviews significant developments in superplastic Mg alloys from the view of alloying strategies, grain structure control and deformation mechanisms, with potential implications for future research and industrial applications of superplastic Mg alloys.

中文翻译：

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超塑性镁合金综述：重点关注合金化策略、晶粒结构控制和变形机制


为了满足轻量化的迫切需求，镁合金因其低密度而受到广泛关注。尽管如此，镁合金固有的较差的室温成形性仍然是成形精密复杂部件的主要障碍，因此需要开发超塑性镁合金。高合金镁合金通常具有优异的超塑性，并且通过丰富的优化第二相颗粒增强了微观结构的热稳定性。对于缺乏颗粒的具有成本效益的低合金镁合金来说，调节溶质偏析最近已成为实现超塑性的一种有前途的方法。此外，双峰晶粒镁合金在超塑性变形方面的潜力已被揭示，从而扩展了设计超塑性材料的选择，超越了传统的细晶粒微观结构方法。本研究从合金化策略、晶粒结构控制和变形机制的角度回顾了超塑性镁合金的重大进展，对超塑性镁合金的未来研究和工业应用具有潜在的影响。