Fundamental Study of P/M (Powder Metallurgy) Processed Elevated Temperature Aluminum Alloys.

摘要

Al-Fe-Ni powder containing 0.19 volume fraction of FeNiA19 dispersoid (approx. 0.18 micrometers) was mechanically alloyed (MA) and hot extruded. There is a significant enhancement in creep response compared to the same alloy without MA and microstructural stability is superior. Improvements in creep strength and microstructural stability are attributed to the presence of fine-scale (approx. 30nm) oxides/carbides introduced during MA distributed uniformly throughout the martix, at matrix-intermetallic interfaces, and on subgrain boundaries. The fine-scale dispersion inhibits coarsening and appears to interact with the diffusing Fe and Ni atoms. Keywords: Aluminum, Iron, Nickel, Alloys, Powder metallurgy, Rapid solidification, Mechanical alloying, Microstructure, Stability, Temperature, Mechanical properties, Dispersion, Strengthening.