Abstract Few studies of cryogenic treatment were focused on nonferrous alloys, such as magnesium alloy. In this work, the effect of cryogenic treatment (77 K) before extrusion on microstructure and mechanical properties of ZK60 alloy was investigated. The results showed that many fine G.P. zones were formed during the cryogenic treatment and then grew to short fine β 1 ′ {\beta }_{1}^{^{\prime} } precipitates when heating before extrusion. These precipitates pinned dynamic recrystallized grain boundaries in the subsequent extrusion, resulting in fine gains and dispersed spherical precipitates. By the cryogenic treatment before extrusion, the extruded ZK60 alloy showed good tensile strength and elongation balance. Especially, elongation was improved by 29%.

中文翻译：

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热挤压前深冷处理提高ZK60镁合金力学性能

摘要 深冷处理的研究很少集中在镁合金等有色合金上。在这项工作中，研究了挤压前深冷处理 (77 K) 对 ZK60 合金显微组织和力学性能的影响。结果表明，在深冷处理过程中形成了许多细小的GP区，然后在挤压前加热时生长为短细的β 1 ′ {\beta }_{1}^{^{\prime} } 沉淀物。这些沉淀物在随后的挤压过程中钉扎了动态再结晶晶界，导致精细的增益和分散的球形沉淀物。通过挤压前​​的深冷处理，挤压出的ZK60合金表现出良好的抗拉强度和伸长率平衡。特别是伸长率提高了29%。