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http://hdl.handle.net/1783.1/3548
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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
Temperature
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 http://www.aip.org/ |
| URI: | http://hdl.handle.net/1783.1/3548 |
| Appears in Collections: | MECH Journal/Magazine Articles
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Size | Format |
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| 121909.pdf | pre-published version | 192Kb | Adobe PDF | View/Open |
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