Abstract
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).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
