Structure and physicomechanical properties of melt-spun TiNi-based alloys

The structure and physicomechanical properties (strength, plasticity, electrical resistivity, and shape memory effect) of TiNi-based binary (stoichiometric and nonstoichiometric compositions) and ternary (alloyed with copper, iron, and cobalt) alloys are studied in the initial (after melt quenching (MQ)) and annealed states. It is shown that the structural states formed upon MQ in all alloys are dependent on the cooling rate; subsequent heat treatment; and the contents of titanium, nickel, and alloying elements. Depending on the chemical compositions, MQ alloys undergo thermoelastic martensitic transformations with the formation of the R, B19′, or B19 martensite.