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Microhardness of binary near-equiatomic Ti-Ni alloys after severe cold rolling and post-deformation annealing

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Inaekyan, K. E. and Brailovski, Vladimir and Prokoshkin, S. D. and Korotitskiy, A. V. and Chernavina, A.. 2009. « Microhardness of binary near-equiatomic Ti-Ni alloys after severe cold rolling and post-deformation annealing ». In 8th European Symposium on Martensitic Transformations (ESOMAT) (Prague, Czech Republic, Sept. 7-11, 2009) Cedex A, France : E D P Sciences.

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Abstract

Comparative HV-microhardness and TEM studies of Ti-50.0at%Ni and 50.26at%Ni alloys subjected to cold-rolling (e=0.3, 1 and 1.72) and post-deformation annealing at 100-700°C (1 hour) are presented. Based on the TEM-measured grain size data for Ti-50.0at%Ni alloy as a function of an annealing temperature (TPDA) higher than 250oC, it was possible to evaluate the grain size (d) of the near-equiatomic Ti-Ni alloys at TPDA<250oC, using exponential extrapolation distribution of the d-TPDA data. It was shown that below a critical grain size (dc = 10 nm), the smaller the grain size (as a result of the decrease in annealing temperature), the lower the microhardness. This softening phenomena can be described, with good correlation between the approximation and experimental data, by the normal-abnormal Hall-Petch transition caused by the influence of the intercrystalline regions and by the melting temperature grain-size dependence.

Item Type: Conference proceeding
Editors:
Editors
Sittner, P.
Paidar, V.
Heller, L.
Seiner, H.
Additional Information: Identifiant de l'article: 05011
Professor:
Professor
Brailovski, Vladimir
Affiliation: Génie mécanique
Date Deposited: 29 Oct 2012 20:48
Last Modified: 26 Apr 2016 13:30
URI: http://espace2.etsmtl.ca/id/eprint/2434

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