Supersaturated Aluminum Alloy Powders.
Abstract
Four aluminum alloys, designed for use at elevated temperatures, supersaturated with iron, chromium and other elements: Ti, V, Zr, were studied. The starting materials were alloy powders made by the RSR (Rapid Solidification Rate) centrifugal atomization process (approx. one million (deg C/sec)) developed by Pratt and Whitney Aircraft and extrusion bars were made from four powders. The as extruded microstructure and the microstructure of the annealed alloys at 482 C (900 F) were investigated by optical and transmission electron microscopy, and by X-ray diffraction. The microstructure included equiaxed grains of aluminum matrix and two types of precipitates, namely: Theta-Al3(Fe,Cr), and Al6(Fe,CR)--which is a metastable phase. The precipitates were different in their shape, size, distribution and location within the grains. The thermal stability of the four alloys was investigated by hardness measurements, following annealing at various temperatures. The alloy structures were found to be stable up to 400 C (750 F). Tensile properties of the alloys were investigated at room temperature, 232 C (450 F) and 332 C (630 F).
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 15, 1981
- Accession Number
- ADA102746
Entities
People
- Dan Shechtman
Organizations
- Technion – Israel Institute of Technology