DEFORMATION DISSOLUTION OF ALUMINIDES OF TRANSITION METALS UNDER SEVERE PLASTIC DEFORMATION

摘要

A special interest for studies has a deformation dissolution of stable and metastable aluminides of twice phase Al alloys with transition metals (Zr, Fe, Cr) by severe plastic deformation (high pressure torsion). It was determined a kinetic of deformation dissolution of the Al_7Cr and Al_(13)Fe_4 stable aluminides and the Al_3Zr and Al_6Fe metastable intermetallic-compound crystals. It was established that metastable crystals of Al_3Zr fully dissolved in Al matrix and super saturated Al-base solid solution with ultra microcrystalline structure was formed in the Al-Zr alloy. Another aluminides destroyed and only partly dissolved in Al matrix. After HPT these sizes decreased up to 10-20 nm and they regular distributed in ultra microcrystalline Al matrix. The hardness of these materials very high -2000-3000 GPa. According the Mossbauer spectroscopy data, HPT results to changes in the phase composition of structure constituents in the Al-Fe alloys.