Abstract
Phase competition at TiNb-based Ni-free shape memory alloys caused by changes of alloying, temperature, external stresses is considered by analysis of experimental results on elastic modulus determination, X-ray diffraction, thermal analysis, mechanical tensile and indentation testing. Martensitic β↔α" transformation undergoes due to a reversible displacements of atoms at (002) plane of orthorhombic unit cell. The martensitic structure has high stability against thermal and mechanical cycling.
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