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Research Papers: Friction & Wear

Tribological Behavior of Heat Treated Ni-rich NiTi Alloys

[+] Author and Article Information
R. Aliasgarian, M. Abedini

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. Tribol 133(3), 031602 (Jul 12, 2011) (6 pages) doi:10.1115/1.4004102 History: Received August 26, 2010; Revised April 11, 2011; Published July 12, 2011; Online July 12, 2011

Effects of heat treatments and applied loads on the tribological behavior of Ti-56.5 wt. % Ni and Ti-57.5 wt. % Ni alloys were investigated. Wear tests were performed on a pin-on-disk tribometer under normal loads of 20 N and 60 N at a sliding speed of 0.3 m/s. The results indicated that the alloys aged at 700 °C showed lower hardness comparing to the alloys aged at 400 °C. Under an applied load of 20 N, the samples aged at 700 °C showed better wear behavior in comparison with the samples aged at 400 °C with a higher hardness. This could be attributed to higher toughness of the samples aged at 700 °C. The results also showed that the wear of the samples aged at 400 °C decreased with the increase in normal load. However, there was an increase in the wear of the samples aged at 700 °C with the increase of load. Formation and stability of tribological layers on the contacting surfaces could be the main reason for the reduction of the wear of the samples aged at 400 °C with the increase in normal load.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

DSC curves for the different aged samples: (a) A6-4, (b) A6-7, (c) A7-4, and (d) A7-7

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Figure 2

Rockwell hardness values of the aged samples

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Figure 3

XRD patterns of the aged samples

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Figure 4

Toughness of the aged samples

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Figure 5

Variation of wear rate with applied load for the aged samples

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Figure 6

SEM micrographs of the worn surfaces of Ti-56.5 wt. % Ni alloy under normal load of 20 N aged at: (a) and (b) 400 °C (A6-4), (c) and (d) 700 °C (A6-7)

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Figure 7

SEM micrographs of the worn surfaces of Ti-57.5 wt. % Ni alloy under normal load of 20 N aged at: (a) and (b) 400 °C (A7-4), (c) and (d) 700 °C (A7-7)

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Figure 8

Cross-section of the worn surfaces of: (a) A7-4 and (b) A7-7 under normal load of 20 N

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Figure 9

SEM micrographs of the worn surfaces of Ti-56.5 wt. % Ni alloy under normal load of 60 N aged at: (a) 400 °C (A6-4), and (b) 700 °C (A6-7)

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Figure 10

SEM micrographs of the worn surfaces of Ti-57.5 wt. % Ni alloy under normal load of 60 N aged at: (a) 400 °C (A7-4), and (b) 700 °C (A7-7)

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Figure 11

SEM micrographs showing wear debris of A7-4 generated under normal loads of: (a) 20 N and (b) 60 N

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Figure 12

Variation of coefficient of friction with sliding distance for A6-4 under normal loads of: (a) 20 N and (b) 60 N

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Figure 13

Variation of coefficient of friction with sliding distance for A6-7 under normal load of 60 N

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