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首页> 美国卫生研究院文献>Materials >A Comparative Study on Permanent Mold Cast and Powder Thixoforming 6061 Aluminum Alloy and Sicp/6061Al Composite: Microstructures and Mechanical Properties
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A Comparative Study on Permanent Mold Cast and Powder Thixoforming 6061 Aluminum Alloy and Sicp/6061Al Composite: Microstructures and Mechanical Properties

机译：永久铸模和粉末触变性6061铝合金和Sicp / 6061Al复合材料的比较研究：微观组织和力学性能

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摘要

Microstructural and mechanical characterization of 10 vol% SiC particles (SiCp) reinforced 6061 Al-based composite fabricated by powder thixoforming (PTF) was investigated in comparison with the PTF and permanent mold cast (PMC) 6061 monolithic alloys. The results reveal that the microstructure of the PMC alloy consists of coarse and equiaxed α dendrites and interdendritic net-like eutectic phases. However, the microstructure of the PTF composite, similar to that of the PTF alloy, consists of near-spheroidal primary particles and intergranular secondarily solidified structures except SiCp, which are distributed in the secondarily solidified structures. The eutectics amount in the PTF materials is distinctly lower than that in the PMC alloy, and the microstructures of the former materials are quite compact while that of the latter alloy is porous. Therefore, the PTF alloy shows better tensile properties than the PMC alloy. Owing to the existence of the SiC reinforcing particles, the PTF composite attains an ultimate tensile strength and yield strength of 230 MPa and 128 MPa, representing an enhancement of 27.8% and 29.3% than those (180 MPa and 99 MPa) of the PTF alloy. A modified model based on three strengthening mechanisms was proposed to calculate the yield strength of the PTF composite. The obtained theoretical results were quite consistent with the experimental data.
机译：与PTF和永久铸模（PMC）6061整体合金相比，研究了粉末触变（PTF）制备的10 vol％SiC颗粒（SiCp）增强的6061 Al基复合材料的微观结构和力学性能。结果表明，PMC合金的显微组织由粗大且等轴的α树突和树突状网状共晶相组成。但是，PTF复合材料的微观结构与PTF合金相似，由近球形的一次颗粒和除SiCp以外的晶间二次固化结构组成，它们分布在二次固化结构中。 PTF材料中的共晶量明显低于PMC合金中的共晶量，前一种材料的微观结构非常致密，而后者的合金则是多孔的。因此，PTF合金显示出比PMC合金更好的拉伸性能。由于存在SiC增强颗粒，PTF复合材料的极限抗拉强度和屈服强度分别为230 MPa和128 MPa，比PTF合金（180 MPa和99 MPa）提高了27.8％和29.3％。 。提出了一种基于三种强化机理的改进模型来计算PTF复合材料的屈服强度。所得理论结果与实验数据基本吻合。

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