ISSN:
1662-9752
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
Rapidly solidified (RS) Al-TM (TM = transition metal) alloys are perspectivematerials from scientific, as well as technological point of view. Generally, they are producedby the melt atomization or by the melt spinning. Subsequent compaction is commonlyperformed by the hot extrusion. Since transition metals, such as Cr, Fe, Ni, Zr, Ti, Mn andothers, have low diffusion coefficients in solid aluminium (lower by several orders ofmagnitude than those of common alloying elements like Cu, Si, Mg, Zn etc.) the RS Al-TMalloys are characterized by a high thermal stability. In this paper, several RS Al-TM(TM = Cr, Fe, Ti, Mn, Ni) alloys prepared by the melt spinning and melt atomization arecompared to commercially available 2xxx, 6xxx and 7xxx wrought alloys. The mainstructural features of both RS and wrought alloys are described. The RS alloys arecharacterized by the presence of micro and nano-scale crystalline and/or quasi-crystallinephases and supersaturated solid solutions. The elevated-temperature behaviour is comparedfor both groups of materials. The thermal stability of the investigated materials is determinedby room temperature hardness measurements after various annealing regimes and a highthermal stability of the RS alloys is demonstrated. The microstructural changes and phasetransformations occurring in the investigated materials upon heating are described. In theAl-TM alloys, very slow decomposition of the supersaturated solid solutions, precipitationand decomposition of the metastable quasi-crystalline phases occur
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.389.pdf
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