Effect of Al additions on the microstructures and tensile properties of AlxCoCr3Fe5Ni high entropy alloys

Document Type

Journal Article

Publication Title

Materials Characterization

Volume

175

Publisher

Elsevier

School

School of Engineering

RAS ID

36201

Funders

Australian Research Council Discovery Projects

National Natural Science Foundation of China

Comments

Zhang, J., Qiu, H., Zhu, H., & Xie, Z. (2021). Effect of Al additions on the microstructures and tensile properties of AlxCoCr3Fe5Ni high entropy alloys. Materials Characterization, 175, article 111091. https://doi.org/10.1016/j.matchar.2021.111091

Abstract

AlxCoCr3Fe5Ni high entropy alloys with varying aluminum contents (x = 0, 0.1, 0.2 and 0.3) were synthesized by induction melting and casting method. The microstructures and tensile properties of the new HEAs were investigated. Different regions of CoCr3Fe5Ni matrix HEA have different microstructures. With the increase of Al content, the microstructure changes from dendrite to lamellar eutectic and dual-phase structure comprising FCC and BCC phases was found in all four samples with different ratios. The volume fraction of BCC phase increased. The ultimate tensile strength (UTS) of the alloy increased, with the highest UTS (1018.9 MPa) achieved at x = 0.3 in this work. On the other hand, increasing Al content further induced distortion of the crystalline lattice and enhanced the alloy strength.

DOI

10.1016/j.matchar.2021.111091

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