Effect of melt spinning variables on the structure and properties of a dispersion strengthened Al-Fe-V-Si alloy
- Texas A and M Univ., College Station, TX (United States). Dept. of Mechanical Engineering
Skinner, et al, have developed a series of quaternary Al-Fe-V-Si alloys, with a view to replace titanium alloys for applications at temperatures up to 650 K. One among them is FVS 1212 (Fe-11.5%, v-1.4%, Si-2.2%, Al-bal). The structure of this alloy is essentially a dispersion of Al{sub 12} (Fe,V){sub 3} dispersoids ({alpha} particles) in aluminum matrix. Though the particles have resistance to coarsening at temperature sup to 650 K, they confer brittleness at room temperature making low-temperature fabrication of this alloy difficult. Since the flow stress is greater when the clustering increases, it may be implied that the drag increases with increase in clustering. As a corollary, dispersion of fine dispersoids, would evidently lead to lower flow stress. This indicates that if the Zener drag is reduced to a sufficiently low value by proper dispersion of fine particles, the flow stress would decrease causing a shift towards superplasticity. This provided the impetus for a basic investigation involving the relationship between the microstructure (and properties) and rapid solidification conditions, so that a desirable starting material could be prepared. It may be mentioned in this connection that the previous investigators chose the rapid solidification conditions to get ribbons varying over a narrow range in thickness. Thus, the cooling rates in these investigations may be presumed to be varied over a small range. It was thus felt by the present investigators that work involving variation of the cooling rate over a larger range would probably provide additional clues for achievement of superplasticity in the dispersion strengthened aluminum alloy under consideration.
- OSTI ID:
- 55420
- Journal Information:
- Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 8 Vol. 32; ISSN SCRMEX; ISSN 0956-716X
- Country of Publication:
- United States
- Language:
- English
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