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

A.Kraynikov,
 
O.Neikov
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2012, #07/08
http://www.materials.kiev.ua/article/1055

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.


HARDENING MECHANISMS, HIGH-TEMPERATURE ALUMINUM ALLOYS, INTERMETALLIC PHASES, RAPID SOLIDIFICATION, THERMAL STABILITY, TRANSITION METAL DOPING