Structure formation and mechanical properties of the high-entropy AlCuNiFeCr alloy prepared by mechanical alloying and spark plasma sintering

JOURNAL OF ALLOYS AND COMPOUNDS

卷:786

Article

Yurkova, A., I¹  Cherniaysky, V. V.¹  Bolbut, V²  Krueger, M.^2,3  Bogomol, I¹ 

[1] Natl Tech Univ Ukraine, Igor Sikorsky Kyiv Polytech Inst, 37 Peremohy Ave, UA-03056 Kiev, Ukraine

[2] Otto von Guericke Univ, Inst Mat & Joining Technol, Univ Pl 2, D-39106 Magdeburg, Germany

[3] Res Ctr Julich, IEK 2, Inst Energy & Climate Res, Julich, Germany

关键词: High-entropy alloy;    Mechanical alloying;    Spark plasma sintering;    Mechanical properties;    Thermal analysis;   

DOI  :  10.1016/j.jallcom.2019.01.341

来源: Elsevier

【 摘 要 】

The phase and structural transformations in equiatomic powder compositions of the Al-Cu-Ni-Fe-Cr system during mechanical alloying (MA), annealing and subsequent spark plasma sintering (SPS) had been studied by X-ray diffraction analysis, scanning and transmission electron microscopy, and differential scanning calorimetry. It has been established that the nanocrystalline high-entropy AICuNiFeCr alloy synthesized during MA consists of a supersaturated solid solution with a bcc crystalline structure. After annealing and spark plasma sintering at 800 degrees C, the alloy becomes three-phased, and consists mainly of one B2-ordered solid solution, one fcc solid solution (25 wt %), and of the (Cr, Fe)(23)C-6 phase (8 wt %). The Vickers hardness of the sintered AICuNiFeCr alloy was 8.35 GPa, and the compressive strength at room temperature reached 1960 MPa. (C) 2019 Elsevier B.V. All rights reserved.

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