Grain size dependence of the elastic modulus in nanostructured NiTi

Grain size dependence of the elastic modulus in nanostructured NiTi

Nanostructured NiTi with a graded surface nanostructure was produced by surface mechanical attrition treatment (SMAT). Nanoindentation measurements revealed that the elastic modulus of SMAT samples increased significantly with decreasing distance from the SMAT surface and grain size, reaching ∼85 GP...

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Veröffentlicht in:Scripta materialia 2010-11, Vol.63 (10), p.977-980
Hauptverfasser: Mei, Q.S., Zhang, L., Tsuchiya, K., Gao, H., Ohmura, T., Tsuzaki, K.
Format: Artikel
Sprache:eng
Schlagworte:
Elastic modulus
Grain size
Intermetallics
Martensitic transformation
Modulus of elasticity
Nanostructure
Nanostructured materials
Nickel base alloys
Nickel compounds
Nickel titanides
Shape memory alloys
Surface mechanical attrition treatment
Titanium compounds
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Zusammenfassung:Nanostructured NiTi with a graded surface nanostructure was produced by surface mechanical attrition treatment (SMAT). Nanoindentation measurements revealed that the elastic modulus of SMAT samples increased significantly with decreasing distance from the SMAT surface and grain size, reaching ∼85 GPa for a grain size of ∼6 nm at the surface. This grain size dependence of the elastic modulus was found to be due to suppression of the stress-induced martensitic transformation in nanostructured NiTi.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2010.07.018