Investigations on plastic flow and creep behaviour in nano and ultrafine grain Ni by nanoindentation

Chatterjee, A and Srivastava, Meenu and Sharma, G and Chakravartty, JK (2014) Investigations on plastic flow and creep behaviour in nano and ultrafine grain Ni by nanoindentation. Materials Letters, 130. pp. 29-31. ISSN 0167-577X

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Official URL: http://dx.doi.org/10.1016/j.matlet.2014.04.186

Abstract

Nanocrystalline(nc)and ultra fine grain(UFG) nickel was produced by electrode position technique in the size range of 25–500nm and its effect on mechanical behaviour was studied by nanoindentation technique. The grain size was found to influence the strain rate sensitivity(m) and showed a decreasing trend with increase in grain size. Effect of grain size on creep behaviour and relevant creep parameters like creep strain rate and stress exponent(n) were estimated for different grain sizes. While creep strain rate did not vary much with grain size, n was found to be very high. The experimental findings suggested dislocation-grain boundary interaction as the rate controlling deformation mechanism. Cyclic nanoindentation tests were performed to understand the role of grain boundaries in the plasticde formation.

Item Type: Article
Additional Information: Copyright to this article belongs to M/s. Elsevier Science B.V
Uncontrolled Keywords: Indentation and hardness;Nanocrystalline materials;Grain boundaries;Creep
Subjects: AERONAUTICS > Aeronautics (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 16 Jun 2015 07:39
Last Modified: 16 Jun 2015 07:39
URI: http://nal-ir.nal.res.in/id/eprint/12162

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