Abstract
Ultrafine-grained (UFG) alloy Ti49:4Ni50:6 possessing both nano- as well as submicrocrystalline structure has been successfully produced using two techniques of severe plastic deformation (SPD) processing: high pressure torsion and equal channel angular pressing. The features of microstructure, martensitic transformation and deformation behavior of the UFG alloy have been studied in details. The effects of grain size on the mechanical and functional properties of the alloy are discussed. (doi:10.2320/matertrans.ME200722) TiNi alloys are well-known thanks to their remarkable properties-enhanced strength, corrosion resistance, and especially superelasticity and shape-memory effect. Due to this, they are very promising for many structural and functional applications in engineering and medicine. 1-3) Superelasticity and shape-memory effect of TiNi alloys are associated with martensitic transformations (MT) of the austenite phase B2 into the martensite phase B19 0 . These two extraordinary properties have been the object of numerous fundamental investigations. At the same time, for various advanced applications superior properties of TiNi would be very desirable, since they are required for miniaturization of articles and enhancement of their functional characteristics. Recent investigations testify that an effective way to enhance the properties of various metals and alloys is their nano- structuring using severe plastic deformation (SPD) process- ing. 4-6) During last years in our laboratories a number of investigations have been performed, dealing with nano- structuring of TiNi alloys, 7-11) using two most popular SPD techniques-high-pressure torsion (HPT) and equal-channel angular pressing (ECAP), and with the effect of the formed nanostructure on the deformation behaviour of alloys and martensitic transformations. This paper reports the results of the investigations of mechanical and functional properties of the Ti49:4Ni50:6 alloy that has an ultrafine-grained structure in the nano- and submicrocrystalline ranges. 2. Experimental Procedure
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