Abstract

In this study, interactive alternate forward extrusion (AFE) experiments with varying number of extrusion passes of AZ31 magnesium alloy were carried out. The evolution of microstructure, and texture and their effects on the mechanical properties were studied. The results show that with the increase of loading passes, the grains are significantly refined, and the dynamic recrystallisation (DRX) structure is uniformly distributed in the product, which is the main reason for the increase in microhardness, compressive strength and failure strain. Further, slip and twinning induced DRX behaviour are considered to be the main deformation methods in the early stage of deformation. Whereas continuous DRX is considered to be the main deformation methods for the change in grain morphology in the later stage. During the extrusion process, the deflection angle of the base pole decreases. Finally, the fibre texture is formed; the texture strength is significantly reduced because of the effect of recrystallisation. The AZ31 magnesium alloy interactive AFE process is discussed with respect to the technological experiment and the microstructure deformation, thus providing a vital scientific basis for further application.

Graphic Abstract

中文翻译：

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交互交替正向挤压（AFE）过程中晶粒细化机制对AZ31B合金组织和性能的作用

摘要

在这项研究中，进行了交互式交替前向挤压（AFE）实验，该实验采用了不同次数的AZ31镁合金挤压道次。研究了显微组织，织构及其对力学性能的影响。结果表明，随着加载次数的增加，晶粒明显细化，动态再结晶（DRX）结构均匀地分布在产品中，这是增加显微硬度，抗压强度和破坏应变的主要原因。此外，滑移和孪生引起的DRX行为被认为是变形早期的主要变形方法。而连续DRX被认为是后期晶粒形态变化的主要变形方法。在挤压过程中，基极的偏转角减小。最终，形成了纤维质地；由于重结晶的作用，质地强度显着降低。从工艺实验和组织变形方面对AZ31镁合金交互式AFE工艺进行了探讨，为进一步的应用提供了重要的科学依据。

图形摘要