-
- Home
- Journals
- Bulletin of Materials Science
- Volume 40
- Issue 4
-
Phase transformation kinetics and microstructure of NiTi shape memory alloy: effect of hydrostatic pressure
Volume 40 Issue 4 August 2017 pp 799-803
-
-
Fulltext
Click here to view fulltext PDF
Permanent link:
https://www.ias.ac.in/article/fulltext/boms/040/04/0799-0803 -
Keywords
Phase transformation ;differential scanning calorimetry ;enthalpy ;thermodynamic properties ;microstructure. -
Abstract
The effect of hydrostatic pressure on the behaviour of reverse and forward transformation temperatures andphysical properties of NiTi shape memory alloy has been investigated. The transformation temperatures and physical properties of the alloy change with applied pressure. It has been clearly seen from differential scanning calorimetry that with theincrease of applied pressure, while $A_{\rm s}$, $A_{\rm f}$ and $M_{\rm f}$ transformation temperatures decrease, Ms value increases. Moreover, it is obvious that with the increase of applied pressure, Gibbs free energy increases by 5.2883 J, while elastic energy increases by 1.4687 J. In addition, entropy of the alloys decreases by 0.2335 J (g $^{\circ}$C)$^{−1}$ with applied pressure. Additionally, it is evident from the scanning electron microscopy images of the samples that there is an obvious difference in the grain sizes of the unpressured sample and the samples on which pressure is applied, the sizes being 10–100 and 30–150 $\mu$m, respectively.
-
Author Affiliations
CENGIZ TATAR1 ZÜLKÜF YILDIRIM1
- Department of Physics, Faculty of Sciences, Firat University, 23169 Elazig, Turkey
-
Dates
- Published
- 15 August 2017
- Manuscript received
- 6 August 2015
- Accepted
- 2 November 2016
-
-
Bulletin of Materials Science
Volume 46, 2023
All articles
Continuous Article Publishing mode
-
Bulletin of Materials Science | News
-
Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020 -
Editorial Note on Continuous Article Publication
Posted on July 25, 2019Click here for Editorial Note on CAP Mode
-