Long-Term Microhardness Evolution in Ti-Ni Shape Memory Alloys Processed by Severe Cold Rolling

Andrey Korotitskiy; K.E. Inaekyan; Vladimir Brailovski; Sergey Prokoshkin

doi:10.4028/www.scientific.net/MSF.584-586.1039

Paper Titles

Diffusion in Ultrafine Grained Materials
p.1012

Finite Element Investigation of the Effect of Hardening Behavior of Alloys on Equal Channel Angular Pressing Performance
p.1021

A Triple-Scale Crystal Plasticity Simulation on Yield Behavior of Annealed FCC Fine-Grained Metals
p.1027

Formation of Multiply-Twinned Particles during Two-Nanoparticles Agglomeration: The Results of MD Simulation
p.1033

Long-Term Microhardness Evolution in Ti-Ni Shape Memory Alloys Processed by Severe Cold Rolling
p.1039

A Phase-Field Simulation of Nucleation from Subgrain and Grain Growth in Static Recrystallization
p.1045

Application of Strain Gradient Plasticity Modelling to High Pressure Torsion
p.1051

Multiscale Crystal Plasticity Simulation with Pseudo-Three-Dimensional Model on Ultrafine-Graining Based on Evolution of Dislocation Structures
p.1057

Numerical Modeling of Dislocation-Grain Boundary Interaction and Continuum Mechanics Analyses for Mechanical Properties of Fine Grained Metals
p.1063

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Long-Term Microhardness Evolution in Ti-Ni Shape Memory Alloys Processed by Severe Cold Rolling

Abstract:

Ti-50.26at.%Ni shape memory alloy samples were subjected to cold rolling (CR) with true strains encompassing from moderate (logarithmic strain e=0.25) to severe (e=2.1) deformation. СR with e = 0.5 and more initiated a partial austenite amorphization. The evaluation of structural changes in the material during its long-term storage was performed using Vickers microhardness (HV) technique. It was shown that during storage at room temperature up to 9 months, microhardness varied following a dome-shaped trend, thus reflecting commonly encountered interaction between two concurrent time-dependent phenomena, the first responsible for the material hardening, and the second, for the material softening. To represent such phenomena, a simple mathematical model was proposed and experimentally validated.