Mechanical Behavior of Novel Suction Cast Ti-Cu-Fe-Co-Ni High Entropy Alloys

Abstract:

The present investigation reports mechanical properties of novel multicomponent Ti_xCu_yFe₂₀Co₂₀Ni₂₀ high entropy alloys (HEAs) with different alloy chemistry (x/y = 1/3, 3/7, 3/5, 9/11, 1, 11/9 and 3/2). The alloy cylinders were prepared by vacuum arc melting-cum-suction casting route. The detailed electron microscopic observations reveal the presence of three different solid solution phases; FCC (a₁) phase, FCC (a₂) phase and BCC (b) phase for all the investigated alloys, whereas ultrafine eutectic between FCC (a₁) phase, and Ti₂ (Co, Ni) - type Laves phase has been observed for the HEAs with x/y = 9/11, 1, 11/9 and 3/2. Room temperature compression test of the suction cast cylinders with aspect ratio of 2/1 has been conducted to obtain mechanical properties of the HEAs. The optimum combination of strength (~ 1.88 GPa) and plasticity (~ 21 %) is obtained for x/y = 9/11; indicating simultaneous improvement of strength as well as plasticity of the novel HEAs. Fractographic analysis of the fractured surfaces reveals mixed mode of fracture for x/y = 1/3, 3/7 and 3/5, ductile mode for x/y = 9/11 and 1, whereas brittle mode of fracture for x/y = 11/9 and 3/2.

• Periodical: Materials Science Forum (Volumes 790-791)
• Pages: 503-508
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.790-791.503
• Online since: May 2014
• Authors: Sumanta Samal, Sutanuka Mohanty, Ajit Kumar Misra, Krishanu Biswas*, B. Govind
• Keywords: High Entropy Alloy, SEM, Suction Casting, XRD

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