Grain boundary engineering of polycrystalline shape memory alloys by phase manipulation for enhanced mechanical ductility and application fatigue life

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United States of America Patent

PATENT NO 10801094
APP PUB NO 20180274071A1
SERIAL NO

15525128

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Abstract

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Provided is a method of making a polycrystalline shape memory alloy (SMA) by forming an alloy with grains and boundaries between them, exposing the alloy to a two-phase temperature range at which a two-phase equilibrium is achieved in the alloy, converting grains to an austenite phase, and precipitating a face-centered-cubic crystal structure solid solution phase at grain boundaries, then quenching the alloy. Also provided is a polycrystalline SMA with a dual-phase microstructure having grains mostly in an austenite phase, a martensite phase, or in transition between an austenite phase and a martensite phase and grain boundaries containing a face-centered-cubic crystal structure solid solution phase.

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Patent Owner(s)

  • RENSSELAER POLYTECHNIC INSTITUTE

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chen, Ying Latham, US 891 19146
Dar, Rebecca Troy, US 1 0

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