Microstructure Characterization and Mechanical Properties of an AM60B Magnesium Alloy Sheet Prepared by the Double‐Pass High Strain Rate Rolling with Gradient Cooling,Advanced Engineering Materials

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Microstructure Characterization and Mechanical Properties of an AM60B Magnesium Alloy Sheet Prepared by the Double‐Pass High Strain Rate Rolling with Gradient Cooling
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-08-25 , DOI: 10.1002/adem.202000625
Xuxing Zhang ₁ , Yan Xu ₁ , Wei Li ₁ , Zewen Yan ₁ , Penghong Hu ₁ , Xiaoke Liu ₁

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AM60B magnesium alloy sheets with excellent mechanical properties are prepared by a double‐pass high strain rate rolling (HSRR) with gradient cooling from 370 to 340 °C. A bimodal lamellar structure, consisting of fine dynamically recrystallized grains, shear bands and fine precipitates, is obtained after the second‐pass HSRR. Formation mechanisms of shear bands are studied in depth. The results show that the formation of shear bands are closely related to the high‐density intersected twin lamellae, boundaries of initial coarse grains and the extensive dynamic recrystallization (DRX), respectively. It is also clarified that the HSRR process of the coarse grained AM60B alloy is dominated in succession by the twinning deformation stage and the following shear bands flow stage. Dynamic precipitation behavior is induced in the double‐pass HSRR process. The DRX is promoted by fine precipitates, resulting in local refinement of the HSRR'ed microstructure. Moreover, the weak basal texture is obtained with peak intensity less than 10. The high‐density twins, DRX and shear bands are suggested as main causes for the basal texture weakening. An outstanding matching between tensile strength and ductility at room temperature are obtained owing to the bimodal lamellar structure and the weakened basal texture.

中文翻译：

梯度冷却双道次高应变速率轧制AM60B镁合金薄板的组织和力学性能

具有优异机械性能的AM60B镁合金薄板是通过在370至340°C的梯度冷却条件下进行两次高应变率轧制（HSRR）制成的。在第二次HSRR之后，获得了一个双峰的层状结构，由细小的动态重结晶晶粒，剪切带和细小的析出物组成。深入研究了剪切带的形成机理。结果表明，剪切带的形成与高密度相交的双晶层，初始粗晶粒的边界和广泛的动态重结晶（DRX）密切相关。还需要说明的是，粗晶AM60B合金的HSRR过程由孪生变形阶段和随后的剪切带流动阶段接连占据主导地位。在两次通过HSRR过程中会诱发动态降水行为。细小沉淀物促进了DRX，导致HSRR微观结构的局部细化。此外，获得的弱基础纹理的峰值强度小于10。建议使用高密度孪晶，DRX和剪切带作为基础纹理减弱的主要原因。由于双峰层状结构和弱的基础结构，在室温下拉伸强度和延展性之间具有出色的匹配性。

更新日期：2020-08-25

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