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Strain rate sensitivity and deformation mechanism of nano-lamellar γ-Ni/Ni5Zr eutectic at room temperature

Published online by Cambridge University Press:  03 August 2020

Anushree Dutta  and
Jayanta Das Open the ORCID record for Jayanta Das [Opens in a new window]
Anushree Dutta
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal721302, India
Jayanta Das*
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal721302, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The strain rate sensitivity (m) of (Ni0.92Zr0.08)100−xAlx (0 ≤ x ≤ 4 at.%) eutectic with varying average lamellae thickness (λw) in the range of 39–275 nm has been investigated in the strain rate range of 8 × 10−5 and 8 × 10−3 s−1 at room temperature. The microstructure of the nano-/ultrafine eutectic composites (NECs) is comprised of alternate lamellae of fcc γ-Ni and Ni5Zr along with 20–31 vol% γ-Ni dendritic phase. The m value of all the investigated NECs lies between 0.0080 and 0.0102, whereas the activation volume (V*) has been estimated to be between 29.7b3 and 49.8b3. High-resolution transmission electron microscopy studies confirm the dislocation-mediated plastic flow including dislocation–lamellae interaction, and their pile-up at the interface, which result in the narrow variation of m for a wide range of λw due to its interlocked lamellar microstructure. A mathematical model has been developed to correlate the m with λw for the experimented NECs with wide microstructure length scale and solute content.

Keywords

Ninanostructuretransmission electron microscopy (TEM)dislocationsmorphology
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 20 , 28 October 2020 , pp. 2777 - 2788
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Copyright © Materials Research Society 2020

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