Mechanical Alloying of Al₇₃Cu₁₁Cr₁₆Alloy from Ion Irradiated Powders

Abstract

Al73Cu11Cr16 alloys were prepared by mechanical alloying of the irradiated by Ar + ions elemental powders. Evolution of alloy structure at ball milling, as well as during the further annealing, was investigated using X-ray diraction and dierential scanning calorimetry. It was shown that ball milling leads to the Cu dissolution in Al and Cr and to the formation of Al2Cu intermetallic phase. An increase of the milling duration leads to an increase of the Al2Cu phase content in the samples. Ion irradiation of initial elemental powders results in an increase of their interaction rate at milling. In the case of irradiated powders using as initial materials, a content of Al2Cu phase after milling is higher than in the case of using non-irradiated elemental powders. No eect of irradiation of initial elemental powders on the phase transformation at heating was observed. The annealing results in the decomposition of Al-and Cr-based supersaturated solid solutions. An increase in the Al2Cu phase content at heating was observed only in the samples, which were milled for 4 h. In the samples milled for 14 h, nearly no increase in Al2Cu phase content at heating was observed. Heating up to 500600• C results in the single-phase decagonal quasicrystalline phase formation for all of the studied samples.