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Title: An origin of functional fatigue of shape memory alloys

Journal Article · · Acta Materialia
 [1];  [1];  [1];  [2];  [1];  [1]
  1. The Ohio State Univ., Columbus, OH (United States). Dept. of Materials Science and Engineering
  2. NASA Glenn Research Center, Cleveland, OH (United States). Materials and Structures Division

Functional fatigue (FF) during thermal and mechanical cycling, which leads to the generation of macroscopic irrecoverable strain and the loss of dimensional stability, is a critical issue that limits the service life of shape memory alloys (SMAs). Although it has been demonstrated experimentally that such a phenomenon is related to microstructural changes, a fundamental understanding of the physical origin of FF is still lacking, especially from a crystallographic point of view. In this study, we show that in addition to the normal martensitic phase transformation pathway (PTP), there is a symmetry-dictated non-phase-transformation pathway (SDNPTP) during phase transformation cycling, whose activation could play a key role in leading to FF. By investigating crystal symmetry changes along both the PTPs and SDNPTPs, the characteristic types of defects (e.g., dislocations and grain boundaries) generated during transformation cycling can be predicted systematically, and agree well with those observed experimentally in NiTi. By analyzing key materials parameters that could suppress the SDNPTPs, strategies to develop high performance SMAs with much improved FF resistance through crystallographic design and transformation pathway engineering are suggested.

Research Organization:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001258
OSTI ID:
1533463
Alternate ID(s):
OSTI ID: 1419994
Journal Information:
Acta Materialia, Vol. 126; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 49 works
Citation information provided by
Web of Science

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Cited By (7)

NiTi-Based Elastocaloric Cooling on the Macroscale: From Basic Concepts to Realization journal August 2018
An experimental investigation of the superelastic fatigue of NiTi SMA wires
  • de Oliveira Ramos, Allysson Daniel; de Araújo, Carlos José; de Oliveira, Henrique Martinni Ramos
  • Journal of the Brazilian Society of Mechanical Sciences and Engineering, Vol. 40, Issue 4 https://doi.org/10.1007/s40430-018-1101-0
journal March 2018
Tensile Deformation of Superelastic NiTi Wires in Wide Temperature and Microstructure Ranges journal December 2018
Phase Transformation Graph and Transformation Pathway Engineering for Shape Memory Alloys journal February 2020
Making metals linear super-elastic with ultralow modulus and nearly zero hysteresis journal January 2019
Actuation Fatigue Life Prediction of Notched Shape Memory Alloy Members journal March 2019
First-Principles Study on a New All-d-Metal Full-Heusler-Based Shape-Memory Alloy Cd 2 MnPd journal September 2019