Effect of High Pressures on the Formation of New Compounds in the Al86Ni2Co6Gd6 Alloy

Menshikova, S.G.; Brazhkin, V.V.

Авторы: Menshikova S.G., Brazhkin V.V.
Журнал: Physics of the Solid State
Том: 64
Номер: 4
Год издания: 2022
Издательство: Pleiades Publishing, Ltd
Местоположение издательства: Road Town, United Kingdom
Первая страница: 197
Последняя страница: 203
DOI: 10.1134/S1063783422050043
Аннотация: Using the X-ray diffraction and electron microscopy methods, the structure and the elemental and phase compositions of hypereutectic alloy Al86Ni2Co6Gd6 (hereinafter, elemental composition in at %) are studied during melt solidification from 1500°C at a rate of 1000 degree/s under high pressures of 3 and 7 GPa.Melt solidification under high pressure leads to a change in the phase composition of the alloy and the formation of an abnormally supersaturated α-Al(Gd) solid solution. The following new phases were synthesized at a pressure of 7 GPa: the Al3Gd* phase (of the Al3U type) containing Co and Ni, which has primitive cubic structure cP4/2 with a lattice parameter of a = 4.285 ± 0.002 Å; the Al8Co4Gd* phase (of the Al8Cr4Gd type), which has tetragonal structure tI26/1 with parameters of a = 8.906 ± 0.003 Å and c = 5.150 ± 0.003 Å. Thestructure of all obtained samples is homogeneous, densely packed, and finely dispersed, without shrinkage cavities and pores. The average microhardness of the samples is high due to the formation of a solid solution and dispersion strengthening.
Добавил в систему: Меньшикова Светлана Геннадьевна

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Effect of High Pressures on the Formation of New Compounds in the Al86Ni2Co6Gd6 Alloyстатья

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