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首页> 外文期刊>Materials Science and Engineering >Influence of heterogeneous microstructures on the mechanical properties of low-temperature friction stir processed AZ91D Mg alloy
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Influence of heterogeneous microstructures on the mechanical properties of low-temperature friction stir processed AZ91D Mg alloy

机译：异质微观结构对低温摩擦搅拌加工AZ91D镁合金机械性能的影响

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摘要

A coarse homogeneous grain structure with a strong basal texture intensity is usually formed in AZ91D Mg alloy, which is produced by friction stir processing, and its strength and ductility are often unsatisfactory. In this work, the microstructure and mechanical properties of die-cast AZ91D were modified using low-temperature friction stir processing. A fine-grained structure was obtained in the stir zone, and abundant {10-12} twins, dislocations, and β-Mg_(17)Al_(12) precipitates formed in the grains. The grain refinement mechanism was determined to be a mixture of continuous dynamic recrystallization, twinning-induced dynamic recrystallization, and particle-stimulated nucleation recrystallization. The appearance of a heterogeneous microstructure was attributed to the low heat input. The new grains originated from the {10-12} twins and randomized {0002} basal texture, and various strengthening mechanisms contributed to the increased yield strength. The {10-12} twin boundaries provided more locations for dislocation nucleation and slip, which increased the strain hardening capacity and ductility; therefore, a satisfactory combination of strength and ductility with a strength of 294 MPa and a total elongation of 18% was obtained in the stir zone. This study provides an efficient one-step strategy to produce heterogeneous grain structures that can balance the strength and ductility of AZ91D without using a cooling medium.
机译：具有强大基底纹理强度的粗糙均匀晶粒结构通常在AZ91D Mg合金中形成，其通过摩擦搅拌加工产生，其强度和延展性通常不令人满意。在这项工作中，使用低温摩擦搅拌加工改性压铸AZ91D的微观结构和力学性能。在搅拌区中获得细粒结构，并在晶粒中形成的丰富{10-12}双胞胎，脱位和β-Mg_（17）Al_（12）沉淀物。确定晶粒细化机理是连续动态重结晶，孪生诱导的动态重结晶和颗粒刺激的核切选的混合物。异质微观结构的外观归因于低热量输入。新的谷物起源于{10-12}双胞胎和随机化{0002}基础纹理，各种强化机制导致屈服强度增加。 {10-12}双界提供了更多的位错成核和滑移的位置，这增加了应变硬化能力和延展性;因此，在搅拌区中获得了令人满意的强度和强度的强度和延展性的组合和18％的总伸长率。该研究提供了一种有效的一步策略，以产生异质晶粒结构，其可以在不使用冷却介质的情况下平衡AZ91D的强度和延展性。

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