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Enhancement of properties in cast Mg-Y-Zn rod processed by severe plastic deformation

机译:严重塑性变形加工增强的Mg-Y-Zn铸棒的性能

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摘要

Ternary Mg-Y-Zn alloys have attracted considerable attention from researchers due to their excellent mechanical properties and unique microstructures, particularly from the presence of long-period stacking-order (LPSO) phases. Microstructural variations and the resulting mechanical properties can be affected by various processing routes, particularly those involving severe plastic deformation of a cast billet. The approach used in this work was based on subjecting cast Mg_(92)Y_4Zn_4 (composition in wt%) billet to severe plastic deformation by three different routes, namely equal channel angular pressing (ECAP), high pressure torsion (HPT) and ECAP followed by HPT, with the aim of refining the microstructure and improving mechanical properties. Samples processed by ECAP were annealed by post-processing and tested in compression and tension. The effect of the processing route and the process parameters on the microstructure and the hardness of the Mg-Y-Zn alloy is reported. An overall positive effect of annealing treatment on the mechanical properties of ECAP-processed alloy is demonstrated.
机译:三元Mg-Y-Zn合金由于其优异的机械性能和独特的微观结构,特别是由于存在长周期堆积顺序(LPSO)相而引起了研究人员的广泛关注。微观结构的变化和所产生的机械性能会受到各种加工路线的影响,特别是那些涉及铸坯严重塑性变形的路线。在这项工作中使用的方法是基于通过三种不同的途径,即等通道角挤压(ECAP),高压扭转(HPT)和ECAP,对Mg_(92)Y_4Zn_4(重量%)铸坯进行严重的塑性变形HPT的产品,其目的是改善微结构并改善机械性能。通过ECAP处理的样品通过后处理进行退火,并进行压缩和拉伸测试。报道了工艺路线和工艺参数对Mg-Y-Zn合金组织和硬度的影响。证明了退火处理对ECAP处理合金的机械性能的总体积极影响。

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