Effect of compression by a high omnidirectional pressure on the structure and some properties of P/M D16 alloy
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High-pressure omnidirectional compression of a D16 aluminum alloy powder at temperatures of 20 and 250°C and a pressure of 37 kbar results in the formation of a homogeneous structure of negligible porosity. After compression at a lower pressure, specimens are more porous, and their structure consists of fine dendritic cells (remnants of as-cast structure), along the boundaries of which there are zones of a severely deformed, refined structure. The quenching of specimens after 30-min heating at 495°C brings about the recrystallization of the refined structure, while requenching after 30-min heating at 530°C induces collective recrystallization. Raising the pressure to 37 kbar increases the density and microhardness of specimens pressed from an aluminum alloy powder to values approaching those characteristic of semifinished products manufactured by pressing.
KeywordsAluminum Porosity Dendritic Cell Recrystallization Aluminum Alloy
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