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首页> 外文期刊>Materials Science and Engineering >Effect of particle size ratio on microstructure and mechanical properties of aluminum matrix composites reinforced with Zr_(48)Cu_(36)Ag_8Al_8 metallic glass particles
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Effect of particle size ratio on microstructure and mechanical properties of aluminum matrix composites reinforced with Zr_(48)Cu_(36)Ag_8Al_8 metallic glass particles

机译：粒径比对Zr_（48）Cu_（36）Ag_8Al_8金属玻璃颗粒增强铝基复合材料组织和力学性能的影响

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摘要

Aluminum matrix composites reinforced with Zr48Cu36Ag8Al8 glassy particles were synthesized by powder metallurgy using reinforcement particles larger than the matrix. The effect of the matrix to reinforcement particle size ratio (PSR) on the microstructure and mechanical properties was studied. The results show that high densification (relative density 98%) was achieved and the glassy particles retained the amorphous structure in all the composites. Quantitative particle distribution analysis in the three-dimensional space indicated that the homogeneity distribution index decreases with reducing PSR. The findings suggest that a ratio of 1/3 = PSR = 1 can be used to obtain composites with rather homogenous distribution of the reinforcement particles. Both compressive and tensile yield strengths of the composites are not sensitive to the PSR change (in the range of 1/3-1/6), whereas the ultimate tensile strength and the ductility are significantly reduced with decreasing PSR; this behavior is accompanied by the change of the fracture mode. The experimental yield strength was found to be consistent with the quantitative strengthening mechanism calculations, and indicated that the reduced matrix ligament size, the thermal mismatch and load bearing are the main strengthening contributions.
机译：使用比基体大的增强颗粒，通过粉末冶金法合成了由Zr48Cu36Ag8Al8玻化颗粒增强的铝基复合材料。研究了基体与增强颗粒尺寸比（PSR）对组织和力学性能的影响。结果表明，实现了高致密化（相对密度> 98％），并且玻璃状颗粒在所有复合物中均保留了非晶态结构。三维空间中的定量颗粒分布分析表明，均匀性分布指数随着PSR的降低而降低。该发现表明，比率1/3 ＜＝ PSR ＜＝ 1可用于获得增强颗粒分布相当均匀的复合材料。复合材料的抗压屈服强度和抗拉屈服强度均对PSR变化不敏感（在1 / 3-1 / 6范围内），而随着PSR的降低，极限抗拉强度和延展性显着降低。这种行为伴随着断裂模式的改变。发现实验屈服强度与定量强化机理计算一致，并表明减小的基体韧带尺寸，热失配和承载是主要的强化贡献。

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