Results 141 to 150 of about 3,389 (193)

Energy harvesting using martensite variant reorientation mechanism in a NiMnGa magnetic shape memory alloy

Applied Physics Letters, 2007
Magnetic shape memory alloys demonstrate significant potential for harvesting waste mechanical energy utilizing the Villari effect. In this study, a few milliwatts of power output are achieved taking advantage of martensite variant reorientation mechanism in Ni51.1Mn24Ga24.9 single crystals under slowly fluctuating loads (10Hz) without optimization in ...
I. Karaman, B. Basaran, H. E. Karaca, A. I. Karsilayan, Y. I. Chumlyakov   +4 more
openaire   +2 more sources

Transformation of dislocations during twin variant reorientation in Ni–Mn–Ga martensite structures

Scripta Materialia, 2012
The transformation of perfect dislocation configurations during twin variant reorientation in Ni–Mn–Ga martensites was analyzed by means of the correspondence matrix method. It was found that the dislocations can change the length of the Burgers vectors remarkably, and hence increase the self-energy by several percent of their initial value.
Maciej J. Szczerba, Marek S. Szczerba
openaire   +2 more sources

Stabilisation of martensite due to shear deformation via variant reorientation in polycrystalline NiTi

Acta Materialia, 2000
The effect of deformation via martensite reorientation on the transformation behaviour of polycrystalline near-equiatomic NiTi was studied. Differential scanning calorimetry measurement showed that both the critical temperature and the endothermic heat of the first reverse transformation of the deformed martensite were increased as compared to an ...
Yinong Liu, D Favier
openaire   +2 more sources

Stress-induced martensite variant reorientation in magnetic shape memory Ni–Mn–Ga single crystal studied by neutron diffraction

Smart Materials and Structures, 2008
Stress-induced martensite variant reorientation in magnetic shape memory Ni?Mn?Ga single crystal was studied in?situ by the neutron diffraction technique. Principles of determination of individual tetragonal martensitic variants in shape memory alloys are explained.
P Molnar, P Sittner, P Lukas, S-P Hannula, O Heczko   +4 more
openaire   +2 more sources

Phenomenological modeling for magneto-mechanical couplings of martensitic variant reorientation in ferromagnetic shape memory alloys

Applied Physics A, 2022
Yuxiang Han, Linxiang Wang, Roderick Melnik   +2 more
openaire   +2 more sources

Investigation of the martensite variant reorientation of the single crystal Ni-Mn-Ga alloy via training processes and a modification with a silicone rubber

Materials Chemistry and Physics, 2023
Wan-Ting Chiu, Akihito Goto, Masaki Tahara, Tomonari Inamura, Hideki Hosoda   +4 more
openaire   +2 more sources

Magnetic field-induced martensitic variant reorientation in magnetic shape memory alloys

Philosophical Magazine, 2005
The magnetically induced martensitic variant reorientation process under applied mechanical load in magnetic shape memory alloys (MSMAs) is considered. Of particular interest is the associated nonlinear and hysteretic macroscopic strain response under variable applied magnetic field in the presence of stress, also known as the magnetic shape memory ...
B. Kiefer, D. C. Lagoudas
openaire   +1 more source

Spontaneous Martensite Detwinning in Ni-Mn-Ga Single Crystal

, 2021
It is well known that the transformation between cubic Austenite phase and tetragonal Martensite phase of Ni-Mn-Ga single crystal Shape Memory Alloy can be controlled by thermo-magneto-mechanical fields.
Guoshun Qin, Chengguan Zhang, Shaobin Zhang, Xue Chen, Yongjun He   +4 more
semanticscholar   +1 more source

Facilitation of Detwinning Through Controlling Crystal Structure in Ti-Zr-Ni-Pd High Temperature Shape Memory Alloys

Social Science Research Network, 2022
Ti-(Zr, Hf)-Ni alloys, in which Zr or Hf is added to Ti-Ni shape memory alloys, are expected to be excellent high temperature shape memory alloys because they have martensitic transformation temperatures above 100°C and high strength at elevated ...
H. Tobe, Shunsuke Kojima, E. Sato
semanticscholar   +1 more source

Self-activated reversibility in the magnetically induced reorientation of martensitic variants in ferromagnetic Ni-Mn-Ga films

Physical Review B, 2010
Magnetically induced reorientation (MIR) of twin variants for [101]-oriented martensite has been studied for Ni-Mn-Ga thin films deposited on (001) YSZ substrates. The MIR effect displayed by these films is self-reversible, is characterized by a small increase in the magnetization, and shows a temperature-dependent activation field.
Yuepeng Zhang, R. A. Hughes, J. F. Britten, J. S. Preston, G. A. Botton, M. Niewczas   +5 more
openaire   +1 more source