Journal
PHYSICS OF METALS AND METALLOGRAPHY
Volume 108, Issue 2, Pages 131-138Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0031918X09080055
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Funding
- International Scientific Technical Center [3208]
- Russian Foundation for Basic Research [07-03-96062, 08-02-00844]
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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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