Open AccessEvolution of Martensitic Nanostructure in NiAl Alloys: Tip Splitting and Bending
Author(s) -
Arunabha M. Roy
Publication year - 2020
Publication title -
material science research india/material science research india
Language(s) - English
Resource type - Journals
eISSN - 2394-0565
pISSN - 0973-3469
DOI - 10.13005/msri.17.special-issue1.02
Subject(s) - materials science , martensite , nial , nanostructure , crystal twinning , tetragonal crystal system , diffusionless transformation , austenite , phase (matter) , bending , condensed matter physics , metallurgy , thermodynamics , microstructure , composite material , nanotechnology , intermetallic , alloy , chemistry , physics , organic chemistry
A phase-field (PF) model for the phase transformation (PT) between austenite and martensite and twinning between two martensite is presented where PT is described by a single order parameter. Such a description helps us to obtain the analytical solution of interface energetics and kinetics. PF-elasticity problems are solved for cubic-to-tetragonal PT in NiAl. The stress and temperature-induced PT and corresponding twinning and growth of the martensitic phase inside a nanocrystal are simulated. It reproduces nontrivial experimentally observed nanostructure such as splitting and bending of martensitic nanostructure as well as twins crossing. The evolution and morphology of such interesting nanostructures are discussed.