Local lattice strain around alloying element and martensitic transformation in titanium alloys

Complexion-mediated martensitic phase transformation in Titanium

The most efficient way to tune microstructures and mechanical properties of metallic alloys lies in designing and using athermal phase transformations. Examples are shape memory alloys and high strength steels, which together stand for 1,500 million tons annual production. In these materials, martensite formation and mechanical twinning are tuned via composition adjustment for realizing complex...

THE CRYSTALLOGRAPHY OF THE BCC TO HCP (ORTHOHEXAGONAL) MARTENSITIC TRANSFORMATION IN DILUTE Zr-Nb ALLOYS: Part I: Lattice Strain and Lattice Invariant Shear

The Bain strain (homogenous strain or lattice strain), the inhomogeneous shear (LIS) and the rigid body rotation in relation with the martensitic transformation in Zr-2.5%Nb alloy has been calculated. The homogeneous lattice strain has been uniquely determined by invoking Lomer’s criterion and the minimum distortion criterion. Both the minimum strain energy and the minimum distortion considerat...

Martensitic Transformation in Microcrystalline Melt-Quenched Fe-Ni Alloys

The features of martensite transformation in Fe (31 32)% Ni melt-quenched alloys are considered. The meltquenching was realized by spinning technique with variable parameters. The influence of the melt-quenching on structural and kinetics transformation parameters is revealed. In particular Ms point is shown to decrease but volume percentage of athermal martensite is found to be invariable with...

EXAFS IN CuZn BRASS ALLOYS DURING MARTENSITIC TRANSFORMATION

Isothermal martensitic transformation in metamagnetic shape memory alloys

We show that in metamagnetic shape memory alloys exhibiting a magnetostructural first order phase transition the direct transition from ferromagnetic austenite to nonmagnetic martensite is isothermal. In contrast to the direct transformation, the reverse one nonmagnetic martensite–ferromagnetic austenite is athermal, just as are athermal both direct and reverse martensitic transformations in co...