Effects of cell size on quasi-static compressive properties of Mg alloy foams

Effects of cell size on quasi-static compressive properties of Mg alloy foams
复制标题

泡孔尺寸对泡沫镁合金准静态压缩性能的影响

DOI:
10.1016/j.matdes.2011.07.066
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发表时间:
2012-02
期刊:
Materials & Design
影响因子:
--
通讯作者:
Yang, Y. S.
Yang, Y. S.
中科院分区:
其他
文献类型:
--
作者:
Xu, Z. G.;Fu, J. W.;Luo, T. J.;Yang, Y. S.

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采用直接发泡法制备了不同泡孔尺寸、固定孔隙率、结构均匀的镁合金泡沫塑料。研究了泡沫的微观结构特征和准静态压缩行为。结果表明,泡沫塑料中的气孔为多边形,孔隙率为87%。减小泡孔尺寸有利于消除泡沫塑料中的大泡孔边缘。泡沫塑料的平均泡孔尺寸越小,压缩时的变形稳定性越好。平均泡孔尺寸的减小通过与更多和更小的泡孔分担载荷来提高泡沫的强度;然而,太小的平均泡孔尺寸可能会削弱强度,因为没有足够的金属保持新细胞壁的完整性。致密化应变几乎不随平均泡孔尺寸和孔隙率的变化而变化。
Mg alloy foams with different cell sizes, fixed porosity, and uniform structure were prepared by direct foaming method. The microstructure characteristics and quasi-static compressive behaviors of the foams were investigated. The results showed that the pores in the foams were polygon with the porosity of 87%. Decreasing the cell size is beneficial to eliminating the big cell edges in the foams. The foams with smaller average cell size possess better deformation stability when being compressed. Decrease of the average cell size improves the strength of the foams by sharing the load with more and smaller cells; however too small average cell size can impair the strength because no enough metals hold the integrity of the new cell walls. The densification strain hardly changes with the varying average cell size and fixed porosity.
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