Published January 2019 | Version v1
Journal article Metadata-only

High fatigue life and cooling efficiency of NiTi shape memory alloy under cyclic compression

Creators

  • 1. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong (China)
  • 2. State Key Laboratory of Traction Power and School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu, Sichuan (China)

Description

We investigate the cyclic compressive fatigue behavior of pseudoelastic polycrystalline NiTi shape memory alloy (SMA) under maximum applied stresses of 800, 950 and 1200 MPa. A fatigue life of over 20 million cycles under 800 MPa is recorded with an average coefficient of performance (COP) of 17.6. Rock-like splitting and chipping through nucleation and slow stable growth of compression-parallel cracks driven by very small stress intensity factor are the major fatigue failure modes of the material. The high fatigue life and cooling efficiency of NiTi SMA under cyclic compressive phase transformation provide a solid mechanical base for its application in solid-state cooling technology.

Additional details

Identifiers

DOI
10.1016/j.scriptamat.2018.09.012;
PII
S1359646218305530;

Publishing Information

Journal Title
Scripta Materialia
Journal Volume
159
Journal Page Range
p. 62-67
ISSN
1359-6462
CODEN
SCMAF7

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
55043163
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
ALLOYS; COEFFICIENT OF PERFORMANCE; NUCLEATION; PHASE TRANSFORMATIONS; POLYCRYSTALS; SHAPE MEMORY EFFECT; STRESS INTENSITY FACTORS
Descriptors DEC
CRYSTALS

Optional Information

Copyright
Copyright (c) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.