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Effect of cooling rate and composition on the microstructure and mechanical properties of (Ni0.92Zr0.08)100−xAlx (0 ≤ x ≤ 4 at.%) ultrafine eutectic composites

Published online by Cambridge University Press:  04 March 2019

Anushree Dutta ,
Parijat P. Jana  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, West Bengal 721302, India
Parijat P. Jana
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, West Bengal 721302, India
Jayanta Das*
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, West Bengal 721302, India
*
a)Address all correspondence to this author. e-mail: j.das@metal.iitkgp.ac.in
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Abstract

The effect of cooling rate on the microstructure evolution and the mechanical properties of ingots and rods of 2–5 mm diameter of (Ni0.92Zr0.08)100−xAlx (0 ≤ x ≤ 4 at.%) ultrafine eutectic composites have been investigated. The microstructure of the composites is comprised of micrometer size γ-Ni dendrites embedded in a nano/-ultrafine lamellar fcc γ-Ni and Ni5Zr matrix. The evolution of the microstructure at a wide range of cooling rates (10–104 K/s) has been analyzed in respect of volume fraction of the phases, lamellar spacing, and secondary dendritic arm spacing. All these composites exhibit high hardness up to 4.6 GPa and yield strength up to 1.6 GPa with large compressive plasticity up to 22% at room temperature. The effect of cooling rates on the strength and hardness, and the plasticity of the nanolamellar composites with wide range of alloy composition have been correlated.

Keywords

nano-eutecticcooling ratestrengthcastingmicrostructure
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 10 , 28 May 2019 , pp. 1704 - 1713
Copyright
Copyright © Materials Research Society 2019 

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