Abstract
Microindentation, X-ray phase analysis, optical and electron microscopy have been used to study the microstructure and bulk physical and mechanical properties (hardness, reduced modulus of elasticity, plasticity index, elastic recovery parameter) of two samples of the binary hypereutectic alloy Al90Gd10 (hereinafter at.%). The first sample was obtained by rapid cooling of the melt at a rate of 1000 deg/sec at a high pressure of 10 GPa, the hardening temperature was 1800 K. The second sample was obtained by pressing the original sample at a high pressure of 5 GPa without melting. Compared to the original sample, the microstructure of both samples is crushed and compacted. The structure of the original sample is represented by two equilibrium phases αAl and Al3Gd. In the sample without melting, in addition to the αAl and Al3Gd phases, a phase with the composition Gd55Al45 was found; in the sample with melting, a phase with the composition Al92Gd8 was found. Features of the structure morphology and changes in the phase composition of samples obtained under high pressure lead to a change in the physical and mechanical properties of the studied alloy.
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