Accession Number : ADA181380

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

Descriptive Note : Final rept. (Annual) 1 Oct 85-28 Feb 86,

Corporate Author : DREXEL UNIV PHILADELPHIA PA DEPT OF MATERIALS ENGINEERING

Personal Author(s) : Lawley,A ; Koczak,M J

PDF Url : ADA181380

Report Date : Apr 1987

Pagination or Media Count : 28

Abstract : 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.

Descriptors :   *CREEP STRENGTH, *MICROSTRUCTURE, *POWDER METALLURGY, *ALUMINUM ALLOYS, ALLOYS, ATOMS, ALUMINUM, CARBIDES, CREEP, GRAIN BOUNDARIES, HIGH TEMPERATURE, IRON, MECHANICAL PROPERTIES, NICKEL, OXIDES, QUICK REACTION, RESPONSE, SOLIDIFICATION, STABILITY, ALUMINUM OXIDES, PERFORMANCE(ENGINEERING), HARDNESS, THERMAL STABILITY, COMPOSITE MATERIALS, DEFORMATION, HOMOGENEITY, MANUFACTURING

Subject Categories : Metallurgy and Metallography
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE