本发明公开了一种可以在大气条件下无保护熔炼的Mg‑Li‑Sn合金及其加工工艺。按重量百分比计，合金的组成为：Li : 10.0‑12.0wt.%, Sn : 2.0‑9.0wt.%, Sr : 4.0‑6.0wt.%, Mn : 0.2‑0.8wt.%, Dy : 0.1‑0.2wt.%, Ho : 0.2‑0.3wt.%, S : 0.8‑1.2wt.%，B : 0.2‑0.4wt.%，余量为镁。本发明针对目前高温下镁锂合金在熔炼时需要进行保护熔炼的现状提供了一种新颖材料学的解决方案。通过合金化的方法获得了阻燃效果优异的Mg‑Li‑Sn阻燃镁合金，实现了镁锂合金在大气条件下的无保护熔炼。当该合金在高温下暴露于大气中时，合金表面会生成一层氧化物和氮化物膜。这些膜结构致密，铺展性强，在高温下为固态且不易挥发，可以提供优良的保护，防止镁合金熔体的进一步氧化。所得镁锂合金材料具有传统镁锂合金室温下的力学性能，并具有传统镁锂合金不具备的高传热系数：110‑120W/m.K，而传统材料的热导系数为80 W/m.K左右。
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