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Microstructure and properties of CoCrNi medium-entropy alloy produced by gas atomization and spark plasma sintering

Published online by Cambridge University Press:  17 April 2019

Jianying Wang ,
Hailin Yang Open the ORCID record for Hailin Yang [Opens in a new window] ,
Jianming Ruan ,
Yun Wang  and
Shouxun Ji
Jianying Wang
Affiliation:
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Hailin Yang*
Affiliation:
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Jianming Ruan
Affiliation:
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Yun Wang
Affiliation:
Institute of Materials and Manufacturing, Brunel University London, Uxbridge, Middlesex UB8 3PH, U.K.
Shouxun Ji
Affiliation:
Institute of Materials and Manufacturing, Brunel University London, Uxbridge, Middlesex UB8 3PH, U.K.
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A homogeneous structured CoCrNi medium-entropy alloy was synthesized by gas atomization and spark plasma sintering (SPS). The mechanical properties, corrosion resistance, and magnetic properties were reported in this study. The as-atomized CoCrNi MEA powder, with a spherical morphology in shape and a mean particle diameter of 61 μm, consisted of a single face-centered cubic (FCC) phase with homogeneous distributions of Co, Cr, and Ni elements. Also, the cross-sectional microstructure of powder particles gradually transformed from fully cellular structure into equiaxed-type structure with increasing particle size. After being sintered by SPS, the CoCrNi MEA consisted of a single FCC phase with a mean grain size of 20.8 μm. Meanwhile, the CoCrNi MEA can capable of offering an ultimate tensile strength of 799 MPa, yield strength of 352 MPa, elongation of 53.6%, and hardness of 195.3 HV. In addition, this MEA showed superior corrosion resistance to that of 304 SS (stainless steel) in both 0.5 mol/L HCl and 1 mol/L NaOH solutions. The magnetization loop indicated that this MEA has good soft magnetic properties.

Keywords

corrosionmagnetic propertiespowder metallurgy
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 12 , 28 June 2019 , pp. 2126 - 2136
Copyright
Copyright © Materials Research Society 2019 

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