Fine-tuning of stress-induced martensite in TRIP/TWIP Ti alloys

Stress-induced Transformations in Ti-mo Alloys

Critical stress for the bcc–hcp martensite nucleation in Ti–6.25at.%Ta and Ti–6.25at.%Nb alloys

Martensitic transformation is an important deformation mechanism in titanium alloys. Using density functional theory calculations, we establish the lattice constants and the associated energetics of the bcc–hcp transformation in Ti–6.25at.%Ta and Ti–6.25at.%Nb alloys. We present a bcc–hcp nucleation model based on the Peierls Nabarro formalism, incorporating the elastic strain energy of the dis...

MICROMECHANICS OF STRESS-INDUCED MARTENSITIC TRANSFORMATION IN MONO- AND POLYCRYSTALLINE SHAPE MEMORY ALLOYS; Ni-Ti

Stress-induced martensitic transformation in single crystals and polycrystals are examined on the basis of micromechanics. A simple method to find a stressand elastic energy-free martensite plate (combined variant), which consists of two variants, is presented. External and internal stresses preferentially produce a combined variant, to which the stresses supply the largest work upon its format...

Stabilisation of Martensite in Copper Based Shape Memory Alloys

The experimental facts on the stabilisation of martensite in copper base shape memory alloys, of interest to the scientific investigator and the practical alloy processor and user are reported. Factors that have an influence on stabilisation are considered in this respect. The mechanisms proposed in the literature to explain stabilisation are critically examined.

Morphology and Crystallography of β ' Martensite in TiNi Alloys

Martensitic transfromation in TiNi alloys of the near-equiatomic composition has been studied by utilizing electron microscopy and diffraction under various thermal treatments. It has been observed that the martensitic transformation is associated with the variants of the product. Two orientations of the martensitic phase were observed as adjacent regions in quenched alloys. These orientations ...