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Dissimilar welding of Al0.1CoCrFeNi high-entropy alloy and AISI304 stainless steel

Published online by Cambridge University Press:  04 June 2019

Rathinavelu Sokkalingam ,
Veerappan Muthupandi ,
Katakam Sivaprasad  and
Konda Gokuldoss Prashanth
Rathinavelu Sokkalingam
Affiliation:
Advanced Materials Processing Laboratory, Department of Metallurgical aqnd Materials Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu 620015, India
Veerappan Muthupandi
Affiliation:
Advanced Materials Processing Laboratory, Department of Metallurgical aqnd Materials Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu 620015, India
Katakam Sivaprasad*
Affiliation:
Advanced Materials Processing Laboratory, Department of Metallurgical aqnd Materials Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu 620015, India
Konda Gokuldoss Prashanth*
Affiliation:
Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Tallinn 19086, Estonia; and Austrian Academy of Science, Erich Schmid Institute of Materials Science, A-8700 Leoben, Austria
*
a)Address all correspondence to these authors. e-mail: ksp@nitt.edu
b)e-mail: kgprashanth@gmail.com
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Abstract

High-entropy alloys (HEAs) have been proven to exhibit superior structural properties from cryogenic to high temperatures, demonstrating their structural stability against the formation of complex intermetallic phases or compounds as major fractions. These characteristics can find applications in nuclear and aerospace sectors as structural materials. As the dissimilar joint design is necessary for such applications, an attempt is made to fabricate the dissimilar transition joint between Al0.1CoCrFeNi-HEA and AISI304 austenitic stainless steel by conventional tungsten inert gas welding. Microstructural characterization by SEM and EBSD clearly revealed the evolution of columnar dendritic structures from the interfaces and their transformation to equiaxed dendritic grains as they reach the weld center. Also, considerable grain coarsening was observed in the heat-affected zone of the HEA. The tensile test results depict that the dissimilar weld joint showed significantly higher tensile strength (590 MPa) than the HEA (327 MPa), making it suitable for structural applications.

Keywords

high-entropy alloyAISI304 austenitic stainless steeldissimilar weldingtungsten inert gas weldingelectron backscattered diffraction analysis
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 15 , 14 August 2019 , pp. 2683 - 2694
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Copyright
Copyright © Materials Research Society 2019 

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