Tensile strength, ductility and fracture of magnesium-silicon alloys
Tensile strength, ductility and fracture of magnesium-silicon alloys
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DOI：
10.1007/bf00357861
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发表时间：
1996-03
影响因子：
4.5
通讯作者：
M. Mabuchi;K. Kubota;K. Higashi
中科院分区：
文献类型：
--
作者：
M. Mabuchi;K. Kubota;K. Higashi
拉伸试验在 293–573 K 之间进行，以研究铸造和挤压镁硅合金的机械性能。对于铸造材料，与纯镁和镁低硅（<10 wt%）合金相比，镁高硅（⩾ 10 wt%）合金在高达 373 K 的温度下表现出较低的最高拉伸强度值，而 573 K 时的强度随着硅含量的增加而增加。在合金中添加铝和锌可有效提高强度。镁高硅合金的强度低于镁低硅合金的事实是因为大量的 Mg2Si 使镁硅合金脆化。显微组织研究表明，铸造材料中的 Mg2Si 颗粒粗大，变形导致颗粒断裂。通过热挤压提高了铸造材料的机械性能。热挤压微观结构的细化是机械性能提高的原因。
Tensile tests were performed between 293–573 K in order to investigate the mechanical properties of cast and extruded Mg-Si alloys. For the cast materials, Mg-high Si (⩾ 10 wt%) alloys showed lower values of the highest tensile strength at temperatures up to 373 K, as compared to pure Mg and Mg-low Si (<10 wt%) alloys, whereas the strength at 573 K increased with increasing Si content. The addition of aluminum and zinc to the alloys was effective in increasing the strength. The fact that the Mg-high Si alloys showed lower strength than the Mg-low Si alloys was because a high volume of Mg2Si embrittled the Mg-Si alloys. Microstructural investigations revealed that the particles of Mg2Si were coarse for the cast materials and fracture of the particles was caused by deformation. The mechanical properties of the cast materials were improved by hot extrusion. Microstructural refinement by hot extrusion was responsible for the improvement of the mechanical properties.