نوع مقاله : مقاله پژوهشی
عنوان مقاله English
نویسندگان English
In the present investigation, Al-Al2Cu composites prepared in-situ via mechanical alloying of a powder mixture containing Al and 10wt.% of two different sizes of Cu powders, cold pressing and sintering. In order to investigate the effects of chemical treatments on the microstructure and properties of composites, in a number of experiments, the as-received Cu powders treated with 15% HCl. The micro-hardness of the as-received and the milled powders as well as the micro-hardness, porosity and macro-hardness of the produced composites quantified and the microstructure of composites studied via light microscopy. The results of this investigation on the Al-Cu powder mixture before sintering as well as on the sintered composite samples revealed the positive effect of chemical treatment on enhanced micro-hardness, decreased porosity and increased macro-hardness of the samples due to more effective interaction between Al and Cu and improved distribution of the Al2Cu intermetallic within the Al matrix. In addition, in all the performed experiments, using fine instead of coarse Cu powders resulted in enhanced interaction between Al and Cu particles and improved quality of samples.
کلیدواژهها English
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