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Mechanical Alloying of Al_{73}Cu_{11}Cr_{16} Alloy from Ion Irradiated Powders

100%

Medvedeva E., Tcherdyntsev V., Makhin'ko F., Gushchina N., Ovchinnikov V.

Acta Physica Polonica A

2014

vol. 126

issue 4

979-983

Al_{73}Cu_{11}Cr_{16} 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 diffraction and differential scanning calorimetry. It was shown that ball milling leads to the Cu dissolution in Al and Cr and to the formation of Al_{2}Cu intermetallic phase. An increase of the milling duration leads to an increase of the Al_{2}Cu 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 Al_{2}Cu phase after milling is higher than in the case of using non-irradiated elemental powders. No effect 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 Al_{2}Cu 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 Al_{2}Cu phase content at heating was observed. Heating up to 500-600°C results in the single-phase decagonal quasicrystalline phase formation for all of the studied samples.

Nanoquasicrystalline Phase in Mechanically Alloyed and Heat-Treated Al_{73}Cu_{11}Cr_{16}

73%

Sviridova T., Shevchukov A., Shelekhov E., Diakonov D., Gorshenkov M., Kaloshkin S., Tcherdyntsev V., Li Z., Fan G.

Acta Physica Polonica A

2014

vol. 126

issue 2

599-602

X-ray diffraction analysis, scanning and transmission electron microscopy, thermal analysis and measurement of chemical composition were implemented to determine structure, thermal stability and chemical composition of the decagonal quasicrystal in Al_{73}Cu_{11}Cr_{16} alloy produced by long-term mechanical alloying of elemental powders followed by annealing at 700°C. According to the TEM investigation such a technique permits to produce a single-phase nanostructural quasicrystal with grain size about 60 nm. Differential thermal analysis revealed that the decagonal phase does not exist above 923°C and undergoes incongruent two-stage melting coming to the end at 1100°C.

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2 Acta Physica Polonica A

2 2014

2 Tcherdyntsev V.

1 Diakonov D.

1 Fan G.

1 Gorshenkov M.

1 Gushchina N.

1 Kaloshkin S.

1 Li Z.

1 Makhin'ko F.

1 Medvedeva E.

1 Ovchinnikov V.

1 Shelekhov E.

1 Shevchukov A.

1 Sviridova T.

Search results

Mechanical Alloying of Al_{73}Cu_{11}Cr_{16} Alloy from Ion Irradiated Powders

Nanoquasicrystalline Phase in Mechanically Alloyed and Heat-Treated Al_{73}Cu_{11}Cr_{16}