Effect of Ta Addition on Microstructure and Hardness of FeCrNiMnCoTax and Al0.5FeCrNiMnCoTax High-Entropy Alloys

Siti Sarah Mohd Pauzi; Mohamad Kamal Harun; Mahesh Talari

doi:10.4028/www.scientific.net/MSF.846.13

Paper Titles

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Effect of Ta Addition on Microstructure and Hardness of FeCrNiMnCoTa_x and Al_0.5FeCrNiMnCoTa_x High-Entropy Alloys
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An Evaluation of Microstructure and Hardness Properties of Zr Added FeNiAlCoCr High Entropy Alloys
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HomeMaterials Science ForumMaterials Science Forum Vol. 846Effect of Ta Addition on Microstructure and...

Effect of Ta Addition on Microstructure and Hardness of FeCrNiMnCoTa_x and Al_0.5FeCrNiMnCoTa_x High-Entropy Alloys

Abstract:

Phase formation, microstructure, and hardness properties of FeCrNiMnCoTa_x and Al_0.5 FeCrNiMnCoTa_x high-entropy alloys (HEA) have been investigated and reported. In this study, FeCrNiMnCoTa_x and Al_0.5FeCrNiMnCoTa_xhigh-entropy alloys (HEA) were synthesized using arc-melting technique in argon (Ar) atmosphere from high purity elements (x in molar ratio, x=0.2, x=0.4 and x=0.6). Ingots from arc-melting were homogenized for 24h at 900°C in Ar atmosphere. Dominant dendritic and inter-dendritic phases were identified from the electron micrographs of these HEA. The area of inter-dendrite region increased for both FeCrNiMnCoTa_x and Al_0.5FeCrNiMnCoTa_xalloys with the increasing of Ta content. The major phases in both FeCrNiMnCoTa_x and Al_0.5FeCrNiMnCoTa_x alloys were identified as FCC and BCC solid-solutions. Addition of Al in Al_0.5FeCrNiMnCoTa_x alloys has resulted in precipitation of a minor phase which was identified as FCC-TaCr₂ Laves phase. As the Ta content increased, hardness of FeCrNiMnCoTa_x and Al_0.5FeCrNiMnCoTa_x alloys increased from 200.34 Hv to 345.10 Hv and 385.22 Hv to 570.86 Hv respectively. Furthermore, presence of Laves phase in Al_0.5FeCrNiMnCoTa_x alloys has resulted in higher hardness values compared to Al free sample, and this higher hardness could be attributed to precipitation strengthening effect by Laves intermetallic phase formation.

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Materials Science Forum (Volume 846)

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13-19

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https://doi.org/10.4028/www.scientific.net/MSF.846.13

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March 2016

Authors:

Siti Sarah Mohd Pauzi, Mohamad Kamal Harun, Mahesh Talari

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Alloying Elements, Hardness, High Entropy Alloys, Microstructure

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