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Formation and stability of equiatomic and nonequiatomic nanocrystalline CuNiCoZnAlTi high-entropy alloys by mechanical alloying
Published in
2010
Volume: 41
   
Issue: 10
Pages: 2703 - 2709
Abstract
Nanocrystalline equiatomic high-entropy alloys (HEAs) have been synthesized by mechanical alloying in the Cu-Ni-Co-Zn-Al-Ti system from the binary CuNi alloy to the hexanary CuNiCoZnAlTi alloy. An attempt also has been made to find the influence of nonequiatomic compositions on the HEA formation by varying the Cu content up to 50 at. pct (CuxNiCoZnAlTi; x = 0, 8.33, 33.33, 49.98 at. pct). The phase formation and stability of mechanically alloyed powder at an elevated temperature (1073 K [800 °C] for 1 hour) were studied. The nanocrystalline equiatomic Cu-Ni-Co-Zn-Al-Ti alloys have a face-centered cubic (fcc) structure up to quinary compositions and have a body-centered cubic (bcc) structure in a hexanary alloy. In nonequiatomic alloys, bcc is the dominating phase in the alloys containing 0 and 8.33 at. pct of Cu, and the fcc phase was observed in alloys with 33.33 and 49.98 at. pct of Cu. The Vicker's bulk hardness and compressive strength of the equiatomic nanocrystalline hexanary CuNiCoZnAlTi HEA after hot isostatic pressing is 8.79 GPa, and the compressive strength is 2.76 GPa. The hardness of these HEAs is higher than most commercial hard facing alloys (e.g., Stellite, which is 4.94 GPa). © The Minerals, Metals & Materials Society and ASM International 2010.
About the journal
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
ISSN10735623
Open AccessNo
Concepts (28)
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    AL-TI ALLOYS
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    BODY-CENTERED CUBIC (BCC) STRUCTURE
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    CU CONTENT
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    CU-NI ALLOYS
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    Elevated temperature
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    FACE CENTERED CUBIC STRUCTURE
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    FACING ALLOYS
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    Fcc phase
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    HIGH ENTROPY ALLOYS
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    MECHANICALLY ALLOYED POWDER
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    Nanocrystallines
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    Phase formations
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    Aluminum
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    Binary alloys
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    Compressive strength
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    Copper alloys
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    Crystal structure
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    Entropy
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    Hardness
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    Hot isostatic pressing
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    Mechanical alloying
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    Metallurgy
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    Phase stability
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    Sintering
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    Titanium alloys
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    Zinc
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    Zinc alloys
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    Nanocrystalline alloys