Compositional effects on strain-controlled actuation fatigue of NiTiHf high temperature shape memory alloys
Compositional effects on strain-controlled actuation fatigue of NiTiHf high temperature shape memory alloys
复制标题
NiTiHf高温形状记忆合金应变控制驱动疲劳的成分效应
DOI：
10.1016/j.scriptamat.2023.115904
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发表时间：
2024
影响因子：
6
通讯作者：
Karaman, I.
中科院分区：
文献类型：
--
作者：
Demblon, A.;Mabe, J.H.;Karaman, I.
富镍NiTiHf高温形状记忆合金在致动器应用中继续获得显著的兴趣。阻碍其广泛使用的一个问题是高载荷下的致动疲劳寿命问题。本文介绍了如何通过局部热机械循环来克服这些疲劳挑战。通过将致动应变限制到小于完全转变可达到的最大值，可显著延长致动寿命周期。通过在加热期间限制上限循环温度并在奥氏体结束温度之前停止每个循环来实现应变控制循环。NiTiHf的四种组合物被测试到三个转化水平。应变控制循环增加了所有组合物的致动疲劳寿命。然而，耐位错塑性的试样获得更长的寿命，在充分的转变循环，但在部分循环，他们失败的更早比样品具有更高的耐塑性。这突出了功能疲劳和结构疲劳之间竞争的重要性。
Nickel-rich NiTiHf high-temperature shape memory alloys continue to garner significant interest for actuator applications. One issue impeding their widespread use is the question of actuation fatigue lifetime under high loads. This paper describes how these fatigue challenges can be overcome by partial thermomechanical cycling. By limiting actuation strain to less than the maximum value that is attainable with full transformation, actuation life cycles can be significantly extended. Strain-controlled cycling is achieved by limiting the upper cycle temperature during heating and stopping each cycle short of the austenite finish temperature. Four compositions of NiTiHf were tested to three levels of transformation. Strain-controlled cycling increased the actuation fatigue lifetimes of all compositions. However, specimens resistant to dislocation plasticity attained longer lives during full transformation cycling, but during partial cycling, they failed earlier than samples with higher resistance to plasticity. This highlights the importance of the competition between functional and structural fatigue.
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DOI：
--
发表时间：
2012
期刊：
Journal of materials engineering and performance (Print)
影响因子：
--
作者：
R. Casati;A. Tuissi
通讯作者：
A. Tuissi
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影响因子：
9.4
作者：
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影响因子：
6
作者：
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影响因子：
4.1
作者：
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通讯作者：
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影响因子：
48
作者：
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通讯作者：
Cardona, Albert