Rapidly Solidified Aluminum-Based Alloys for High-Temperature Performance.
I. Structure.

Abstract

The paper examines the phase composition formed in rapid solidification of a number of high-temperature aluminum alloys. The main hardening phases and associated phase transitions have been studied in the following alloys: Al–Fe–Ce, Al–Fe–Cr–(TM), Al–Cr–Zr(Mn), and Al–Fe–V(Mo)–Si. The phase composition of the alloys is shown to be critically dependent on the cooling rate. High-temperature materials are particularly sensitive to the solidification rate, since they are doped with nonsoluble alloying elements. Fine quasicrystalline phases, which make a significant contribution to the hardening at low and high temperatures, are present in rapidly solidified materials doped with iron. In addition to these phases, Al₃TM intermetallics characterized by high thermal stability and low rate of coarsening play an important role in modern materials.