Transformation Response and Interface-Mediated Damping in High-Temperature Shape Memory Alloys Containing Ductile Second Phases

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The development of structural-functional integrated materials with high damping capacity and thermal stability is essential for aerospace and precision engineering applications. This study investigates NiTiHf/Nb shape memory alloys with nanowire-like and spherical Nb phases through heat treatments at various temperatures to assess the impact of Nb phase morphology on damping behavior. Compared to the alloy with nanowire Nb phase, the alloy with spherical Nb phase demonstrates higher transformation temperatures, a narrower thermal hysteresis with △T decreasing from 78 K to 66 K, and an internal friction value ~125% higher in the martensitic state, while maintaining a wide operating temperature range of up to 400 K. These results indicate that the alloy with spherical Nb phases exhibits improved transformation reversibility and a promoted damping response. The frequency-dependent internal friction response and transmission electron microscopy observations further suggest that the enhanced damping capacity is attributed to the combined effects of interface-related dislocation activity and martensitic twin-boundary motion. These findings underscore the significance of controlling Nb phase morphology as an effective interface-engineering strategy for the design of advanced high-damping shape memory alloys.

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Materials Science Forum (Volume 1197)

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11-18

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July 2026

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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