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Shape memory alloy nanostructures with coupled

Abstract Employing the GinzburgLandau phase-field theory, a new coupled dynamic thermo-mechanical 3D model has been proposed for modeling the cubic-to-tetragonal martensitic transformations in shape memory alloy (SMA) nanostructures. The stress-induced phase transformations and thermo-mechanical behavior of nanostructured SMAs have been investigated. A Macromechanical Constitutive Model of Shape Memory Aug 09, 2012 · A new variable of shape memory residual factor was introduced, which will tend to zero with the increasing of the number of cycles. Exponential form equations are established to describe the evolution of shape memory residual factor, elastic modulus and critical stress, in which the influence of strain-rate, number of cycles and temperature are

EFFECT OF AGING ON THE PHASE TRANSFORMATION

AND MECHANICAL BEHAVIOR OF Ti36Ni49Hf15 HIGH TEMPERATURE SHAPE MEMORY ALLOY X.L. Meng, Y.F. Zheng, Z. Wang and L.C. Zhao School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, Peoples Republic of China (Received August 19, 1999) (Accepted in revised form September 16, 1999) Grain size effect on mechanical performance of Superelastic NiTi shape memory alloy (SMA) has been widely utilized as the structural material in automotive, aerospace, mini actuators and micro-electromechanical systems (MEMS), robotics and biomedical field [1 , 2]. The extraordinary mechanical performance of NiTi, i.e. shape memory effect (SME) and superelasticity (SE), is Hot Rolling and Ageing Effect on the Pseudoelasticity The value of quantifies the shape memory effect. In Figure 2 (a) curves B and C represent second and third loading and unloading sequences. 4. DISCUSSION The effects of ageing after hot rolling on the martensitic phase transformation behavior and mechanical behavior of Ti-rich TiNi shape memory alloys have been discussed.

Learning from Superelasticity Data to Search for Ti-Ni

May 12, 2021 · Xi'an Jiaotong University (XJTU) - State Key Laboratory for Mechanical Behavior of Materials Abstract In the present study, the reversible adiabatic temperature change (Tad) of shape memory alloys was shown to be proportional to the mechanical work released by the reverse martensitic transformation during unloading (Wu). Martensitic transformation in nanostructured TiNi shape Nov 25, 2006 · TiNi exhibits excellent shape memory effect, superelasticity, corrosion resistance and biocompatibility, and thus is one of the most important engineering materials. Another unique aspect of this material is that it is susceptible for solid-state amorphization. Amorphization by various particle beam irradiation methods has been reported , . Severe plastic deformation (SPD) is another method Micromechamical Analysis for Hysteretic Behavior of Mechanical behavior of a unidirectional TiNi shape memory alloy (SMA) fiber composite subjected to a single isothermal loading and unloading cycle is analyzed using a threedimensional micromechanic

Microstructure Evolution and Mechanical Behavior in Shape

Influence of grain size on the martensitic transformation and mechanical properties of shape memory alloy i49.3Ni50.7 was studied. The features of the mechanical response of coarse-grained and nanostructured alloys were identified. The microstructure investigations involved the use of Shape memory alloy nanostructures with coupled dynamic Employing the Ginzburg-Landau phase-field theory, a new coupled dynamic thermo-mechanical 3D model has been proposed for modeling the cubic-to-tetragonal martensitic transformations in shape memory alloy (SMA) nanostructures. The stress-induced phase transformations and thermo-mechanical behavior of nanostructured SMAs have been investigated. Transformations and Mechanical Properties of TiNiAg Oct 22, 2020 · Keywords:shape memory alloy; silver; doping; mechanical properties; nanostructured material; wire 1. Introduction The development and study of new TiNi-based materials is a promising direction in the eld of medical materials science. The special properties of the alloys are shape-memory and superelasticity

Mechanical Behavior of Nanostructured Melt Spun NiTi

Nanostructured NiTi Shape memory alloys (SMAs) were fabricated by cold-rolling melt-spun near equatomic NiTi. SMAs represent a unique class of materials that undergo a reversible phase transformation allowing these materials to display dramatic stress-induced and temperature-induced deformation that is recoverable.