Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8014674 | Materials Letters | 2018 | 4 Pages |
Abstract
A quarternary Co-free Ni35Al21.67Cr21.67Fe21.67 high entropy alloy was designed and prepared by arc melting. The Ni35Al21.67Cr21.67Fe21.67 high entropy alloy (HEA) possesses disordered BCC phase and ordered BCC phase (B2). A “sunflower-like” microstructure was found in Ni35Al21.67Cr21.67Fe21.67 high entropy alloy. B2 phase forms the continuous matrix with the disordered BCC spherical particles (200â¯nm-300â¯nm) in 'core' region. In 'petal' region, striped B2 phases are inlaid in disordered BCC matrix. Moreover, the result of mechanical property test suggests that alloy presents outstanding compressive strength and excellent ductility with the microstructure of B2/BCC phase. The alloy showed an excellent comprehensive properties at room temperature (yield strength Ï0.2â¯=â¯1471â¯MPa, compressive strength Ïbâ¯=â¯3541â¯MPa and compression rate εâ¯=â¯40%) , which was superior to some traditional metallic materials. High strength was mainly attributed to high volume fraction of hard B2 phase matrix and B2 precipitations strengthening. Dislocations motion in disordered BCC matrix provided ductility for the alloy. The Ni35Al21.67Cr21.67Fe21.67 HEA has promising use in future structural applications.
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Authors
Lu Zhang, Dong Zhou, Bangsheng Li,