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Ultrahigh damping in -phase state of Ti–Ni–Fe alloy
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Developing high damping materials with high strength is of significant technological importance, and Ti–Ni-based alloys are attracting much attention in this respect. The high damping peak in martensite state has been shown to be related to the interaction between twin boundary and hydrogen according to recent studies. In this letter the authors studied damping capacity of phase in alloy, which has the lowest twinning shear among known martensites (, , and ) in Ti–Ni-based alloys. They obtained a very high internal friction for the relaxation-type peak in phase, much higher than that for martensite or martensite. Their results suggest that choosing martensite with smallest twinning shear (thus with the highest mobility) is an important guideline for developing very high damping materials. Furthermore, avoiding introducing precipitates and dislocations is also essential for obtaining high damping.
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