نتایج جستجو برای: induced martensite
تعداد نتایج: 981957 فیلتر نتایج به سال:
The experiments on Ni-Mn-Ga single crystal shape memory alloy under a heating-cooling cycle demonstrate that the automatically generated twin laminate structure of compatible austenite-martensite interface in forward martensitic phase transition is significantly different from reverse transition, even though temperature hysteresis small (As−Ms around 4 °C). Moreover, after cooling-induced auste...
The origin of the martensitic transition in the magnetic shape memory alloy Ni-Mn-Ga has been widely discussed. While several studies suggest it is electronically driven, the adaptive martensite model reproduced the peculiar nonharmonic lattice modulation. We used femtosecond spectroscopy to probe the temperature and doping dependence of collective modes, and scanning tunneling microscopy revea...
Abstract Cryogenic turning can be used to produce deformation-induced martensite in metastable austenitic steels. Martensite exhibits a higher hardness than austenite and increases the wear resistance of workpiece. In order reliably induce desired content subsurface zone during process, non-destructive, contactless real-time testing method is necessary. Eddy current an electromagnetic that non-...
Concerning a Fe-Mn-Si shape memory alloy, it was thought of magnetic measurements to follow the evolutions with temperature of an as quenched steel before and after a 2.5% prestrain. INTRODUCTION The shape memory effect, related to the reverse E -. y transformation of a single crystal of FeMn-Si, was fist shown by Sato (1). Many works are devoted to polycrystalline Fe-Mn-Si steels (2,3). The E ...
A 3D finite-strain constitutive model for the deformation response of NiTi at single crystal level is proposed. The accounts reversible phase transformation from austenite to martensite habit plane variants, plastic in phase, and rate effects induced latent heat. It developed within formalism irreversible thermodynamics with internal state variables based on Eulerian logarithmic strain its corr...
The transformation-induced plasticity (TRIP)-effect is an efficient way to increase the formability in high performance steels. Hence, optimal stability of retained austenite crucial benefit most from this effect. In present work, in-situ energy X-ray diffraction was used study martensite transformation upon uniaxial tensile loading a TRIP-assisted steel produced by quenching and partitioning (...
Martensitic transformation associated with a tensile deformation of CuAlMn single crystals in [loo] direction was studied using in-situ transmission electron microscopy. Stress/strain curves obtained during pseudoelastic deformation of microscopic samples were slightly different fiom bulk ones due to martensite formation in the stage of stress increase and a permanent deformation during the fir...
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