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Title: Wearless scratch on NiTi shape memory alloy due to phase transformational shakedown
Authors: Feng, Xi-Qiao
Qian, Linmao
Yan, Wenyi
Sun, Qing-Ping
Keywords: NiTi
Shape memory alloy
Phase transformational shakedown
Wear-resistant behavior
Issue Date: Mar-2008
Citation: Applied physics letters, v. 92, 121909 (2008)
Abstract: Cyclic microscratch tests were performed to examine the scratching behavior of NiTi shape memory alloy. It shows a superior wear resistance within the temperature range of 22–120°C, but the corresponding physical mechanisms are different at low and high temperatures. We introduced the concept of phase transformational shakedown to interpret the wear-resistant behavior. At room temperature, a scratch groove may be caused by repeated scratching, but its depth stops increasing after a certain number of scratching cycles once the phase transformational shakedown state has been achieved. The groove will be self-healed upon heating as a result of the shape memory effect. At 60 and 120°C, however, no evident scratch groove is observed under the same load due to the pseudoelastic effect and the increase in the phase transition stress with temperature.
Rights: Applied Physics Letter © copyright 2008 American Institute of Physics. The Journal's web site is located at
Appears in Collections:MECH Journal/Magazine Articles

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