The Effect of Thermomechanical Treatment on the Structure and Mechanical Properties of the Ti49.5Ni50.5 Shape-Memory Alloy

• Published in: Physics of metals and metallography Vol. 123; no. 10; pp. 996 - 1003
• Main Authors: Kuranova, N. N., Makarov, V. V., Pushin, V. G.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.10.2022; Springer Nature B.V
• Subjects: Chemistry and Materials Science; Diffusion; Elongation; Martensitic transformations; Materials Science; Mechanical properties; Metallic Materials; Phase Transformations; Recrystallization; Shape effects; Shape memory alloys; Structure; Tension tests; Thermomechanical treatment; Ultimate tensile strength; Ultrafines; shape-memory alloys; martensitic transformation; aging; mechanical properties; plastic deformation
• ISSN: 0031-918X; 1555-6190
• DOI: 10.1134/S0031918X22600993

The effect of thermomechanical treatment on the structure and phase transformations of the Ti–50.5 at % Ni shape-memory alloy was studied. The data on the specific features of mechanical properties and character of fracture in the initial ultrafine-grained (UFG) alloy were gained by tension tests in combination with optical and electron microscopy and X-ray diffraction analysis. The UFG alloy structure was created by multipass plastic rolling deformation. The alloy was established to have high levels of its mechanical properties (ultimate strength of up to 1400 MPa at a relative elongation of more than 25%) due to the revealed effect of a complex reaction: recrystallization with the formation of a UFG structure and associated highly dispersed heterogeneous decomposition.