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Effect of Powder Morphology and Chemical Distribution on Properties of Multicomponent Alloys Produced Via Powder Metallurgy

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Abstract

In this study, effects of morphology and chemical distribution of powder on mechanical properties was investigated in Al0.5CoCrCuFeNi high-entropy alloys produced via powder metallurgy. At the early stages of ball-milling, Cr-deficient large powder is flattened, while Cr-rich powder is fractured to small particles because of the flattening of ductile particles and fragmentation of hard particles at initial milling stage. However, with an increase in the milling duration, the Cr atoms were more uniformly distributed throughout the powders and the powders exhibited spherical shape with smooth surface. Moreover, as the ball-milling duration increased from 36 to 96 h, the Vickers hardness and compressive yield strength also increased from 433 Hv0.5 and 1166 MPa to 525 Hv0.5 and 1739 MPa, respectively. This was attributed to the spherical powders reducing as well as forming fine and uniform microstructures in sintered alloys. Also, the elemental uniformity suppressed the formation of dendritic-unfavorable carbides.

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Acknowledgements

This study was financially supported by the National Research Foundation (NRF) of Korea and funded by Ministry of Science, ICT (MSIT; 2015R1A5A7037615), and the Ministry of Trade, Industry and Energy (MOTIE) and Korea Institute for Advancement of Technology (KIAT) through the International Cooperative R&D program (P0006837). This research was also financially supported from the Civil-Military Technology cooperation program (No. 18-CM-MA-15).

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  1. Department of Advanced Materials Engineering, Kookmin University, Seoul, 02707, Republic of Korea

    Seungjin Nam, Jae-Hun Kim & Hyunjoo Choi

  2. Department of Advanced Materials Engineering, Sunchon National University, Suncheon, 57922, Republic of Korea

    Se Eun Shin

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Correspondence to Jae-Hun Kim or Hyunjoo Choi.

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Nam, S., Shin, S.E., Kim, JH. et al. Effect of Powder Morphology and Chemical Distribution on Properties of Multicomponent Alloys Produced Via Powder Metallurgy. Met. Mater. Int. 26, 1385–1393 (2020). https://doi.org/10.1007/s12540-020-00769-8

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