Electronic Resource
s.l. ; Stafa-Zurich, Switzerland
Solid state phenomena
Vol. 138 (Mar. 2008), p. 145-152
ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Aluminium-chromium based alloys are promising candidates for manufacture of lightcomponents exposed to elevated temperatures. The work describes properties of Al-6.0wt.%Cr-2.1wt.%Fe-0.5wt.%Ti alloy. The rapidly solidified powder was prepared by the pressure nitrogenmelt atomization. The powder was then subject to heat treatment in order to investigate solid statephase transformations. Compaction of the powder was carried out by hot extrusion after preheatingat 450 °C. Microstructure, phase composition and structural transformations on heat treatment wereinvestigated in the as-atomized powder, as well as in the as-extruded alloy. It is found thatmetastable state of the rapidly solidified powder is characterized by presence of quasi-crystallinephases and supersaturated solid solution. Heating before and during the hot extrusion inducesdecomposition of the supersaturated solid solution and quasicrystalline to crystalline phasetransformations. The hot extruded alloy has a refined recrystallized structure that remains verystable aven after long-term annealing at 400 °C. Mechanical properties of the extruded alloy arediscussed in terms of strengthening mechanisms
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.138.145.pdf
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