The dielectric functions of equiatomic Ni-Ti alloys were measured by spectroscopic ellipsometry in the energy range of 1.5–5.4 eV at ∼423 and at ∼25 K. The peak at ∼2.26 eV in the B19′ (monoclinic structure) optical conductivity spectrum has a slightly larger magnitude than in the B2 (cubic CsCl structure) phase, while the shoulder at ∼3.5 eVbecomes weaker and almost indiscernible upon martensi...

Martensitic Ni-Mn-Ga alloys with the five layered modulated structure (10M) provide a way to produce motion by the magnetic shape memory (MSM) effect. MSM actuation is based on alternating the twin structure by applying a magnetic field and/or mechanical stress at suitable ranges. For the actuator use, it is necessary to understand the long-term cyclic magneto-mechanical loading behavior of the...

We have recently constructed a phenomenological theory that provides a unified explanation for athermal and isothermal martensitic transformation processes. On the basis of this theory, we predict some properties of martensitic transformation and confirm them experimentally using some Fe-based alloys and a Ni-Co-Mn-In magnetic shape memory alloy.

We have calculated binding surfaces for cla changes (along the Bain path) and changes of the atomic volume of metallic systems undergoing martensitic transformations. We find characteristic differences between the surfaces of nonmagnetic systems (with a close packed low temperature structure) and magnetic systems (with a less close packed low temperature structure). The ab initio calculations h...

A Viewpoint on: Role of Electronic Structure in the Martensitic Phase Transition of Ni2Mn1+xSn1−x Studied by Hard-X-Ray Photoelectron Spectroscopy and Ab Initio Calculation M. Ye, A. Kimura, Y. Miura, M. Shirai, Y. T. Cui, K. Shimada, H. Namatame, M. Taniguchi, S. Ueda, K. Kobayashi, R. Kainuma, T. Shishido, K. Fukushima and T. Kanomata Phys. Rev. Lett. 104, 176401 (2010) – Published April 26, ...

The monotonic and cyclic deformation behavior of ultrafine-grained metastable austenitic steel AISI 304L, produced by severe plastic deformation, was investigated. Under monotonic loading, the martensitic phase transformation in the ultrafine-grained state is strongly favored. Under cyclic loading, the martensitic transformation behavior is similar to the coarse-grained condition, but the cycli...

A phenomenological description of martensitic transformation is proposed on the basis of such parameters as: a degree of lattice coherency between austenite and martensite phases, mobility of interphase boundaries, elastic energy stored during martensitic transformation and degree of its relaxation. Son),: experimental results confirming the proposed ideas are presented.

In our recent article (1), we proposed that Fermiology measurements can be used as a complementary probe for determining the low-temperature state of Li. In a letter (2) criticizing our conclusions, MartinezCanales, Loa, and Ackland (MLA) claim (i) that “obtaining dHvA signals from martensitic microstructures is usually impossible” and (ii) that the experimental data of Hunt et al. (3), in part...