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Effect of die parameters on the grain size, mechanical properties and fracture mechanism of extruded AZ31 magnesium alloys

机译：模具参数对挤出AZ31镁合金晶粒尺寸，力学性能和断裂机理的影响

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摘要

The study was carried out to evaluate the effect of extrusion ratio and extrusion die angle on the mechanical properties and microstructure of AZ31 magnesium alloy at 300°C extrusion temperature with three different extrusion ratio of 1.77, 2.68, 3.55 and die angles of 10°, 15°, 20°. It was identified that microstructure was significantly refined for all extrusion ratios. The average size was decreased to the range of 4.1 μm-13.3 μm from 22.4 μm. By increasing extrusion ratio, it was observed that the tensile properties were considerably improved at room temperatures and tensile strength was reached to maximum 331 MPa after extrusion when initial measured value was 168.28 MPa. Significant grain refinement, enhanced mechanical strength and increase in micro-hardness values were observed with smaller die angles. It was observed that DRX mechanism is active and it supports the grain refinement. Dimples seen on the fractured surface were deeper that indicates the enhanced ductility of the material. Finally, among all the tests higher extrusion ratio with lower die angle gives better grain distribution in the microstructure and higher mechanical strength to the product.
机译：进行该研究以评估挤出比和挤出模角对300℃挤出温度的挤出比和挤出模角在AZ31镁合金的机械性能和微观结构中，具有1.77,2.68,3.55和10°的模具角度， 15°，20°。鉴定出微观结构对于所有挤出比例显着精制。平均尺寸降低到22.4μm的4.1μm-13.3μm的范围内。通过增加挤出率，观察到在初始测量值为168.28MPa的挤出后，在室温下显着提高拉伸性能，并且在挤出后达到最大331MPa。用较小的模角观察到显着的晶粒细化，增强的机械强度和微硬度值的增加。观察到DRX机制是有效的，它支持晶粒细化。在裂缝表面上看到的凹坑更深，表示材料的增强延展性。最后，在所有测试中，具有较低模角的挤出率更高的挤出比在微观结构和更高的产品的机械强度下具有更好的晶粒分布。

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