TY - JOUR
T1 - Unraveling Frequency Effects in Shape Memory Alloys
T2 - NiTi and FeMnAlNi
AU - Sidharth, R.
AU - Mohammed, A. S.K.
AU - Abuzaid, W.
AU - Sehitoglu, H.
N1 - Funding Information:
This work is supported by the National Science Foundation DMR Grant 1709515 Metallic Materials and Nanomaterials Program which is gratefully acknowledged. We would like to thank Prof. Yuri Chumlyakov of Tomsk State University, Russia for providing the single crystals. SEM and EBSD were carried out in part in the Frederick Seitz Materials Research Laboratory Central Research Facilities, University of Illinois Urbana-Champaign.
Funding Information:
This work is supported by the National Science Foundation DMR Grant 1709515 Metallic Materials and Nanomaterials Program which is gratefully acknowledged. We would like to thank Prof. Yuri Chumlyakov of Tomsk State University, Russia for providing the single crystals. SEM and EBSD were carried out in part in the Frederick Seitz Materials Research Laboratory Central Research Facilities, University of Illinois Urbana-Champaign.
Publisher Copyright:
© 2021, ASM International.
PY - 2021/6
Y1 - 2021/6
N2 - With the presence of internal interfaces such as the austenite–martensite interface and the internal twin boundaries in the martensite, shape memory alloys (SMAs) can be employed in passive/active damping applications. Due to the latent heat of transformation, a temperature rise/drop during a load/unload cycle is expected to dynamically couple with the mechanical response of the SMA and influence the stress levels of forward/reverse transformation and thus the hysteretic area (i.e. the dissipated energy). Additionally, the temperature change per cycle is a function of loading frequency due to momentary heat transfer effects. To this end, for the first time, we demonstrate a rate insensitive shape memory alloy system, Fe43.5Mn34Al15Ni7.5 which also exhibits near-zero temperature dependent stress–strain response. Contrastingly, we show that Ni50.8Ti, which is widely used commercially, is highly rate sensitive. With straightforward in situ experiments, complemented with thermomechanical modelling, we pinpoint the key material parameter which dictates frequency sensitivity. The corresponding results are then discussed in the light of different mechanisms contributing to the damping capacity of SMAs.
AB - With the presence of internal interfaces such as the austenite–martensite interface and the internal twin boundaries in the martensite, shape memory alloys (SMAs) can be employed in passive/active damping applications. Due to the latent heat of transformation, a temperature rise/drop during a load/unload cycle is expected to dynamically couple with the mechanical response of the SMA and influence the stress levels of forward/reverse transformation and thus the hysteretic area (i.e. the dissipated energy). Additionally, the temperature change per cycle is a function of loading frequency due to momentary heat transfer effects. To this end, for the first time, we demonstrate a rate insensitive shape memory alloy system, Fe43.5Mn34Al15Ni7.5 which also exhibits near-zero temperature dependent stress–strain response. Contrastingly, we show that Ni50.8Ti, which is widely used commercially, is highly rate sensitive. With straightforward in situ experiments, complemented with thermomechanical modelling, we pinpoint the key material parameter which dictates frequency sensitivity. The corresponding results are then discussed in the light of different mechanisms contributing to the damping capacity of SMAs.
KW - Clausius-Clapeyron
KW - Damping capacity
KW - Entropy of transformation
KW - Hysteresis
KW - Internal friction
KW - Latent heat
KW - Superelasticity
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U2 - 10.1007/s40830-021-00335-0
DO - 10.1007/s40830-021-00335-0
M3 - Article
AN - SCOPUS:85108199916
SN - 2199-384X
VL - 7
SP - 235
EP - 249
JO - Shape Memory and Superelasticity
JF - Shape Memory and Superelasticity
IS - 2
ER -