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首页> 外文期刊>Journal of Materials Engineering and Performance >Room-Temperature Microstructural Evolution of Extruded AM80 Magnesium Alloys under Dynamic Loading
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Room-Temperature Microstructural Evolution of Extruded AM80 Magnesium Alloys under Dynamic Loading

机译：挤压AM80镁合金室温微观结构演化

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摘要

Dynamic compression tests were conducted using a split Hopkinson pressure bar along the transverse direction at strain rates (SRs) of 3200 and 6000s(-1). The initial microstructure significantly affected the flow stress behavior and microstructural evolution of the two studied AM80 magnesium alloys. Under the same SR loading, the as-extruded alloy exhibited an apparently higher flow stress. At a SR of 6000s(-1), the flow stress of the as-extruded alloy exhibited a visible decrease (similar to 34MPa) as the strain increased to similar to 0.2, whereas a constant flow stress was exhibited by the solution-treated alloy. High-density dislocations and mechanical twins were detected in the two alloys at a SR of 3200s(-1). Interestingly, dynamic recrystallization (DRX) with an average grain size of similar to 2 mu m was only identified in the as-extruded alloy as the applied SR increased to 6000s(-1). The increased localized deformation in the as-extruded alloy due to the retained strain energy and high critical twinning stress improved the DRX driving force, thereby resulting in visibly different micrographs of the two alloys when impacted at the SR of 6000s(-1).
机译：在3200和6000s（-1）的应变速率（Sr）的横向上，使用沿横向进行动态压缩试验。初始微观结构显着影响了两种研究的AM80镁合金的流量应力行为和微观结构演化。在相同的SR负载下，以挤出合金表现出显然更高的流量应力。在6000秒（-1）的SR处，作为菌株增加至类似于0.2的应变，所以挤出合金的流量应力显示出可见的降低（类似于34MPa），而通过溶液处理的合金表现出恒定的流量应力。在3200s（-1）的两种合金中检测到高密度脱位和机械双胞胎。有趣的是，仅在用挤出的合金中鉴定了平均晶粒尺寸的动态再结晶（DRX），因为施加的SR增加到6000s（-1）。由于保留的应变能量和高临界孪晶应力提高了DRX驱动力，增加了挤出合金中的局部变形增加，从而在6000s（-1）的SR处受到影响时，导致两种合金的明显不同的显微照片。

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