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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructural Evolution and Local Mechanical Properties of Friction Stir Processed Mg-3Gd-1Zn Cast Alloy
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Microstructural Evolution and Local Mechanical Properties of Friction Stir Processed Mg-3Gd-1Zn Cast Alloy

机译：搅拌摩擦加工Mg-3Gd-1Zn铸造合金的组织演变和局部力学性能

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摘要

Microstructural evolution, hardness, and shear strength of the cast plates of GZ31 magnesium alloy were investigated after friction stir processing (FSP). Due to severe plastic deformation and dynamic recrystallization, FSP breaks the dendrites and results in a fine homogenous structure in the stirred zone (SZ) having average grain sizes of about 4.0 and 2.5 mu m in the one and two-pass FSPed plates, respectively. As a novel approach, strength of the processed plates was examined by shear punch testing in three regions of the SZ on the surface layer, namely, center line (CL), retreating side (RS), and advancing side (AS). FSP showed great potential in the enhancement of SZ ultimate shear strength from 114 to about 152 and 155 MPa in the one and two-pass FSPed materials, respectively. The same trend was observed in hardness values of the SZ, where the average hardness of the base material increased from 41 to 60 and 68 Vickers after one and two passes of FSP, respectively. The variations in the shear strength of the CL, RS, and AS zones of the SZ were about 5% for the first pass of FSP, the effect which was decreased to less than 2% after two passes of FSP.
机译：研究了搅拌摩擦加工（FSP）后GZ31镁合金铸板的组织演变，硬度和剪切强度。由于严重的塑性变形和动态重结晶，FSP会破坏树枝状结晶，并在搅拌区（SZ）中形成细小的均匀结构，在单道和两道FSP板中的平均晶粒尺寸分别约为4.0和2.5μm。作为一种新颖的方法，通过在表面层的SZ的三个区域，即中心线（CL），后退侧（RS）和前进侧（AS）的三个区域进行剪切冲孔测试来检查加工后的板的强度。 FSP在单次和两次通过FSP的材料中显示出将SZ极限抗剪强度从114分别提高到约152和155 MPa的巨大潜力。在SZ的硬度值中观察到了相同的趋势，在FSP经过一遍和两遍后，基材的平均硬度分别从41维氏硬度增加到60维氏硬度和68维氏硬度。对于FSP的第一遍，SZ的CL，RS和AS区的抗剪强度变化约为5％，经过两次FSP后，其影响减小到不足2％。

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