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Research Papers

Effect of Phase Transformation on the Wear Behavior of NiTi Alloy

[+] Author and Article Information
M. Abedini, M. Nili Ahmadabadi, R. Mahmudi

School of Metallurgy and Materials Engineering, University of Tehran, P. O. Box 11155-4563, Tehran, Iran

H. M. Ghasemi1

School of Metallurgy and Materials Engineering, University of Tehran, P. O. Box 11155-4563, Tehran, Iranhghasemi@ut.ac.ir

1

Corresponding author.

J. Eng. Mater. Technol 132(3), 031010 (Jun 17, 2010) (5 pages) doi:10.1115/1.4001593 History: Received November 02, 2009; Revised April 07, 2010; Published June 17, 2010; Online June 17, 2010

In this paper, mechanical and tribological properties of a Ti-50.3 at % Ni alloy were investigated. The transformation temperatures of the alloy were determined using differential scanning calorimetry. Three-point bending tests were performed to characterize the pseudoelasticity and shape memory effects. Uni-axial compression tests were also performed at different testing temperatures. The wear tests were conducted using a pin-on-disk tribometer at testing temperatures ranging from 0°C to 80°C. The wear results showed that with increasing the testing temperature from 0°C to 50°C, the wear of the alloy was decreased, which could be attributed to the higher pseudoelasticity of the alloy at a testing temperature of 50°C. The pseudoelasticity of the alloy decreased at a higher testing temperature of 80°C; however, its wear resistance increased considerably due to higher ultimate strength and work hardening.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Microstructure of the heat treated NiTi alloy: (a) at a low magnification and (b) at a higher magnification

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Figure 2

Three-point bending load-deflection curves of the NiTi alloy at different testing temperatures

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Figure 3

Amount of recovered deflection due to the pseudoelasticity effect obtained from the three-point bending load-deflection curves in Fig. 2

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Figure 4

Amount of thermal deflection recovery due to the shape memory effect upon heating the unloaded samples obtained in the three-point bending tests to a temperature of 100°C

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Figure 5

Amount of the total recoverable deflection due to the sum of the pseudoelasticity and the shape memory effects

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Figure 6

True stress-strain curves of the NiTi alloy at different testing temperatures obtained from the uni-axial compression tests

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Figure 7

Variation in the ultimate strength of the NiTi alloy as a function of the testing temperature obtained from the stress-strain curves in Fig. 6

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Figure 8

Work hardening curves of the NiTi alloy obtained from the stress-strain curves in Fig. 6

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Figure 9

Variation in the wear rate of the NiTi alloy as a function of wear testing temperature under a normal load of 10 N for a sliding distance of 1000 m

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