Contributions of different strengthening mechanisms to the shear strength of an extruded Mg–4Zn–0.5Ca alloy
Contributions of different strengthening mechanisms to the shear strength of an extruded Mg–4Zn–0.5Ca alloy
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DOI：
10.1080/14786435.2015.1083134
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发表时间：
2015-09
影响因子：
1.6
通讯作者：
F. Naghdi;R. Mahmudi;J. Kang;H.S. Kim
中科院分区：
文献类型：
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作者：
F. Naghdi;R. Mahmudi;J. Kang;H.S. Kim
采用剪切冲头试验研究了挤压态Mg-4 Zn-0.5Ca合金的室温剪切变形行为。挤压工艺有效地细化了显微组织，导致晶粒尺寸为4.6 ± 1.4 μm。计算了不同强化机制对材料室温剪切屈服应力和整体流动应力的贡献。这些强化机制包括位错强化、晶界强化、固溶强化和第二相粒子强化。晶界强化和固溶硬化对材料的整体强度有显著的贡献，而第二相粒子和位错的贡献很小。根据材料的织构软化，讨论了计算强度值与实验强度值之间的差异。
The shear deformation behaviour of an extruded Mg–4Zn–0.5Ca alloy was studied using shear punch testing at room temperature. The extrusion process effectively refined the microstructure, leading to a grain size of 4.6 ± 1.4 μm. Contributions of different strengthening mechanisms to the room temperature shear yield stress, and overall flow stress of the material, were calculated. These mechanisms include dislocation strengthening, grain boundary strengthening, solid solution hardening and strengthening resulting from second-phase particles. Grain boundary strengthening and solid solution hardening made significant contributions to the overall strength of the material, while the contributions of second-phase particles and dislocations were trivial. The observed differences between calculated and experimental strength values were discussed based on the textural softening of the material.