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The degredation mechanism of Ti-Nb-Zr-Sn alloys during cyclic testing
Superelastic Ti-Nb alloys show a reversible stress-driven transformation, leading to mechanical hysteresis when subjected to cyclic loading regimes. This has led to their potential for vibration damping applications in the aerospace sector. However, on repeated cycling, they undergo functional fatigue, which leads to a degradation of superelastic properties. This behaviour has been characterised, with two distinct stages of fatigue identified, with the latter stage shown to result in a continued decrease in hysteresis area, which is detrimental for damping applications. However, the factors driving the transition are not known, with two similar commercial alloys showing very different behaviour. In this paper, several alloys spanning the compositional gap between these two commercial alloys are mechanically tested. It is found that the initial value of sigmaSIM and the rate at which sigmaSIM decays in the first few cycles determine how long an alloy will remain in stage I during service.
The degredation mechanism of Ti-Nb-Zr-Sn alloys during cyclic testing
Superelastic Ti-Nb alloys show a reversible stress-driven transformation, leading to mechanical hysteresis when subjected to cyclic loading regimes. This has led to their potential for vibration damping applications in the aerospace sector. However, on repeated cycling, they undergo functional fatigue, which leads to a degradation of superelastic properties. This behaviour has been characterised, with two distinct stages of fatigue identified, with the latter stage shown to result in a continued decrease in hysteresis area, which is detrimental for damping applications. However, the factors driving the transition are not known, with two similar commercial alloys showing very different behaviour. In this paper, several alloys spanning the compositional gap between these two commercial alloys are mechanically tested. It is found that the initial value of sigmaSIM and the rate at which sigmaSIM decays in the first few cycles determine how long an alloy will remain in stage I during service.
The degredation mechanism of Ti-Nb-Zr-Sn alloys during cyclic testing
Reed, Oliver (author) / Church, Nicole (author) / Talbot, Chris (author) / Connor, Leigh (author) / Michalik, Stefan (author) / Jones, Nick (author)
2023-06-13
Conference paper
Electronic Resource
English
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