Formation of Supersaturated Solid Solutions in Al Alloys with Transition Metals Upon Shear under Pressure

Abstract:

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Metallographic, X-ray diffraction and electron microscopy were used to study the phase compositions and structure of rapidly solidified the Al- alloys transition metals (Zr, Fe, Cr) subjected to severe plastic deformation (SPD) by torsion under a high quasi-hydrostatic pressure. It was established that upon SPD a number and a size of aluminides decrease with increasing a degree of deformation. For example, the maximum effect of deformation - induced dissolution of the particles are observed in the case where they have a dendritic structure and are about one μm in size. Upon SPD the supersaturation of α-phase increases by a factor of 2.5. (for rapidly solidified Al-Cr and Al-Cr-Zr alloys) and by a factor of 10 (for rapidly solidified Al-Fe alloy). After SPD all alloys have submicrocrystalline (SMK) Al-based matrix with grain size of 100-200 nm and high hardness of 2 GPa. The thermal stability of SMK deformed materials and some specific features of post deformation phenomena as an aging and a recrystallization were investigated.

Info:

Periodical:

Materials Science Forum (Volumes 503-504)

Edited by:

Zenji Horita

Pages:

413-418

DOI:

10.4028/www.scientific.net/MSF.503-504.413

Citation:

I.G. Brodova et al., "Formation of Supersaturated Solid Solutions in Al Alloys with Transition Metals Upon Shear under Pressure", Materials Science Forum, Vols. 503-504, pp. 413-418, 2006

Online since:

January 2006

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$35.00

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