Abstract
Results of investigations of the initial structure of large-size Ti49.4Ni50.6 samples subjected to severe plastic deformation by torsion under a high pressure (HPT) are reported. The study was performed using transmission and scanning electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, and measurements of mechanical properties. Under an applied pressure of 6 GPa, the alloy was found to undergo a martensitic B2 → B19′ transformation. Even after HPT using a single revolution of anvils, the granular structure of titanium nickelide is refined so that there is formed a nanocrystalline state of B2 austenite (i.e., the reverse martensitic B19′ → B2 transformation occurs) and amorphization of the alloy begins. The HPT with a high number of revolutions leads to the almost complete amorphization of the alloy, which is explained by a high degree of shear deformation. In this case, all nanocrystalline inclusions in the amorphous matrix have an ordered B2 structure.
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Original Russian Text © D.V. Gunderov, N.N. Kuranova, A.V. Luk’yanov, A.N. Uksusnikov, E.A. Prokof’ev, L.I. Yurchenko, R.Z. Valiev, V.G. Pushin, 2009, published in Fizika Metallov i Metallovedenie, 2009, Vol. 108, No. 2, pp. 139–146.
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Gunderov, D.V., Kuranova, N.N., Luk’yanov, A.V. et al. Application of severe plastic deformation by torsion to form amorphous and nanocrystalline states in large-size TiNi alloy sample. Phys. Metals Metallogr. 108, 131–138 (2009). https://doi.org/10.1134/S0031918X09080055
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DOI: https://doi.org/10.1134/S0031918X09080055