Variant Selection Map of External Load During Ni4Ti3 Precipitation in Nitinol: a Theoretical and Phase Field Study
ACTA MECHANICA SINICA（2024）
Shandong University
Abstract
The morphology of Ni4Ti3 precipitates is important in tuning the martensitic transformation (MT) behavior and mechanical properties of nitinol. Constrained ageing is effective in engineering the morphology of Ni4Ti3 precipitates due to the variant selection effect of external load which is still lacking. In this work, maps of variant selection effect of external load applied along all crystallographic directions are obtained by using a combination of theoretical analyses and phase field simulations. It is found that maps produced by uniaxial tension and uniaxial compression are quite different. The number and types of Ni4Ti3 variants preferred by external load vary as the loading direction changes. Moreover, factors influencing the strength of variant selection effect are discovered. This work provides insights on understanding the Ni4Ti3 precipitation process and sheds light on the engineering of morphology of Ni4Ti3 precipitates for desired mechanical and functional properties.
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Key words
Ni4Ti3,Variant selection,NiTi alloy,Phase field model,Precipitation morphology
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