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首页> 外文期刊>Materials transactions >Effect of Multi-Pass Equal Channel Angular Pressing on the Microstructure and Mechanical Properties of a Directional Solidification Mg98.5Zn0.5Y1 Alloy
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Effect of Multi-Pass Equal Channel Angular Pressing on the Microstructure and Mechanical Properties of a Directional Solidification Mg98.5Zn0.5Y1 Alloy

机译：多通等通道角度压制对定向凝固Mg98.5Zn0.5Y1合金的微观结构和力学性能的影响

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摘要

The microstructure evolutions and mechanical properties of a directional-solidification (DS) Mg98.5Zn0.5Y1 alloy during multi-pass equal channel angular pressing (ECAP) were systematically investigated in this work. The results showed that there was a large amount of lamellar structure in the DS alloy. These lamellar structure have almost the same orientation inside the grains. After ECAP, dynamic recrystallization (DRX) occurred and the diameter of DRXed alpha-Mg grains decreased to 2 mu m. During ECAP, large volume fraction of LPSO phase experienced a four-step morphological evolution during ECAP, i.e. original lath -> bent lath -> cracked lath -> smaller particles. Meanwhile, the schematic illustration of recrystallization in the DS-Mg98.5Zn0.5Y1 alloy during ECAP was established. Compression test results indicated that the alloy was markedly strengthened after multi-pass ECAP, and the main reason for the significantly enhanced mechanical properties can be ascribed to the DRXed alpha-Mg grains, kinking and refined 14H particles.
机译：在这项工作中系统地研究了在多通相等通道角压（ECAP）期间定向凝固（DS）Mg98.5Zn0.5Y1合金的微观结构演进和机械性能。结果表明，DS合金中存在大量的层状结构。这些层状结构在晶粒内具有几乎相同的取向。在Ecap后，发生动态再结晶（DRX），并且Drxedα-Mg晶粒的直径降至2μm。在ECAP期间，LPSO相的大容量分数在ECAP期间经历了四步形态演变，即原始板条 - >弯曲板条 - >裂纹板条 - >较小的颗粒。同时，建立了ECAP期间DS-MG98.5ZN0.5Y1合金中重结晶的示意图。压缩试验结果表明，在多通铸造后，合金显着加强，并且显着增强的机械性能的主要原因可以归因于Drxedα-Mg晶粒，扭结和精制的14H颗粒。

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