Elastic and irreversible energies of a two-stage martensitic transformation in niti utilizing calorimetric measurements

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Elastic energy and irreversible energy are quantified based on calorimetric measurements. We analyze energetics for each stage of the stress-free, thermally induced two-stage phase transformation A R B19 in an aged Ni-rich NiTi shape memory alloy. Heating/cooling rates are imposed from 1 K/min up to 100 K/min. We compare energetic analysis after multiple thermal cycles to virgin (i.e., first-cycle) material. Fundamental thermodynamic formulations are applied from two perspectives: the free energy change dG, and the rate of change of free energy expressed as dG/df m. Two measures of irreversible contributions are defined: the difference between the forward and reverse transformation heats, and the product of the entropy and the thermal hysteresis. Higher values are determined for the former. For scan rates of 10 K/min and greater, the energetic values become relatively stable. Substantial variations are evident at 1, 5, and 10 K/min. The scan rate impacts the elastic strain energy and irreversible energy of the B19 markedly compared with the R-phase transition. The findings are rationalized considering morphologic changes at the lower scan rates and the impacts on elastic and irreversible energies.

Original languageEnglish (US)
Pages (from-to)2732-2740
Number of pages9
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume45
Issue number6
DOIs
StatePublished - Jan 1 2014

Fingerprint

Martensitic transformations
martensitic transformation
Free energy
Phase transitions
Strain energy
Shape memory effect
free energy
Hysteresis
energy
Entropy
cycles
Thermodynamics
Cooling
Heating
shape memory alloys
phase transformations
hysteresis
Hot Temperature
entropy
cooling

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

@article{8f9b4015e5fe4da187f6dc725bb664fe,
title = "Elastic and irreversible energies of a two-stage martensitic transformation in niti utilizing calorimetric measurements",
abstract = "Elastic energy and irreversible energy are quantified based on calorimetric measurements. We analyze energetics for each stage of the stress-free, thermally induced two-stage phase transformation A R B19 in an aged Ni-rich NiTi shape memory alloy. Heating/cooling rates are imposed from 1 K/min up to 100 K/min. We compare energetic analysis after multiple thermal cycles to virgin (i.e., first-cycle) material. Fundamental thermodynamic formulations are applied from two perspectives: the free energy change dG, and the rate of change of free energy expressed as dG/df m. Two measures of irreversible contributions are defined: the difference between the forward and reverse transformation heats, and the product of the entropy and the thermal hysteresis. Higher values are determined for the former. For scan rates of 10 K/min and greater, the energetic values become relatively stable. Substantial variations are evident at 1, 5, and 10 K/min. The scan rate impacts the elastic strain energy and irreversible energy of the B19 markedly compared with the R-phase transition. The findings are rationalized considering morphologic changes at the lower scan rates and the impacts on elastic and irreversible energies.",
author = "Asheesh Lanba and Hamilton, {Reginald Felix}",
year = "2014",
month = "1",
day = "1",
doi = "10.1007/s11661-014-2234-0",
language = "English (US)",
volume = "45",
pages = "2732--2740",
journal = "Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science",
issn = "1073-5623",
publisher = "Springer Boston",
number = "6",

}

TY - JOUR

T1 - Elastic and irreversible energies of a two-stage martensitic transformation in niti utilizing calorimetric measurements

AU - Lanba, Asheesh

AU - Hamilton, Reginald Felix

PY - 2014/1/1

Y1 - 2014/1/1

N2 - Elastic energy and irreversible energy are quantified based on calorimetric measurements. We analyze energetics for each stage of the stress-free, thermally induced two-stage phase transformation A R B19 in an aged Ni-rich NiTi shape memory alloy. Heating/cooling rates are imposed from 1 K/min up to 100 K/min. We compare energetic analysis after multiple thermal cycles to virgin (i.e., first-cycle) material. Fundamental thermodynamic formulations are applied from two perspectives: the free energy change dG, and the rate of change of free energy expressed as dG/df m. Two measures of irreversible contributions are defined: the difference between the forward and reverse transformation heats, and the product of the entropy and the thermal hysteresis. Higher values are determined for the former. For scan rates of 10 K/min and greater, the energetic values become relatively stable. Substantial variations are evident at 1, 5, and 10 K/min. The scan rate impacts the elastic strain energy and irreversible energy of the B19 markedly compared with the R-phase transition. The findings are rationalized considering morphologic changes at the lower scan rates and the impacts on elastic and irreversible energies.

AB - Elastic energy and irreversible energy are quantified based on calorimetric measurements. We analyze energetics for each stage of the stress-free, thermally induced two-stage phase transformation A R B19 in an aged Ni-rich NiTi shape memory alloy. Heating/cooling rates are imposed from 1 K/min up to 100 K/min. We compare energetic analysis after multiple thermal cycles to virgin (i.e., first-cycle) material. Fundamental thermodynamic formulations are applied from two perspectives: the free energy change dG, and the rate of change of free energy expressed as dG/df m. Two measures of irreversible contributions are defined: the difference between the forward and reverse transformation heats, and the product of the entropy and the thermal hysteresis. Higher values are determined for the former. For scan rates of 10 K/min and greater, the energetic values become relatively stable. Substantial variations are evident at 1, 5, and 10 K/min. The scan rate impacts the elastic strain energy and irreversible energy of the B19 markedly compared with the R-phase transition. The findings are rationalized considering morphologic changes at the lower scan rates and the impacts on elastic and irreversible energies.

UR - http://www.scopus.com/inward/record.url?scp=84899936295&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84899936295&partnerID=8YFLogxK

U2 - 10.1007/s11661-014-2234-0

DO - 10.1007/s11661-014-2234-0

M3 - Article

AN - SCOPUS:84899936295

VL - 45

SP - 2732

EP - 2740

JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

SN - 1073-5623

IS - 6

ER -