A novel Fe40Mn40Cr10Co10/SiC medium-entropy nanocomposite reinforced by the nanoparticles-woven architectural structures

JOURNAL OF ALLOYS AND COMPOUNDS

卷:772

Article

Wang, Jianying¹  Yang, Hailin¹  Liu, Zhilin^2,3  Ji, Shouxun⁴  Li, Ruidi¹  Ruan, Jianming¹ 

[1] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China

[2] Cent South Univ, Coll Mech & Elect Engn, Changsha 410083, Peoples R China

[3] IMDEA Mat Inst, C Erik Kandel 2, Madrid 28906, Spain

[4] Brunel Univ London, Inst Mat & Mfg, Uxbridge UB8 3PH, Middx, England

关键词: Medium-entropy alloy;    Nanocomposites;    Mechanical properties;    Spark plasma sintering;    Microstructures;   

DOI  :  10.1016/j.jallcom.2018.09.050

来源: Elsevier

【 摘 要 】

A novel Fe40Mn40Cr10Co10/SiC nanocomposite was designed and fabricated by adding SiC nanoparticles through mechanical alloying and SPS treatment. Compared with pure Fe40Mn40Cr10Co10 medium-entropy alloy (MEA), addition of 10 vol.% SiC nanoparticles increased the ultimate compressive strength from 1.571 to 2.513 GPa as well as the hardness from 320 to 805 HV. Meanwhile, defects such as visible porosities were considerably lowered. The improved properties are mainly attributed to (a) the formation of nanoparticles-woven architectural structures consisting of externally-added SiC nano-particles between neighboring grains and (b) the in-situly formed M23C6 (M = Fe, Cr, Co) nanocarbides for grain refinement and precipitation strengthening in Fe40Mn40Cr10Co10 MEA, respectively. Combined with experimental investigation, solidification pathway of different potential phases was verified using thermodynamic calculation. (C) 2018 Elsevier B.V. All rights reserved.

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