Multiphase design enables ultra-strong non-equiatomic WMoVFeNi high-density multicomponent alloys with large deformability AITranslate

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Chinese Library Classification Number:TG132[一般工业技术—材料科学与工程]

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To develop ultra-strong high-density bulk materials with large deformability,we introduce a multiphase design strategy in a WMoVFeNi multicomponent alloy(MCA)system,and demonstrate it by investigating two prototype MCAs,i.e.,W₅₀Mo₁₀V₅(Fe₆₄Ni₃₆)₃₅and W₅₅Mo₁₅V₅(Fe₆₄Ni₃₆)₂₅(at.%).The two bulk MCAs were fabricated by mechanical alloying(MA)plus spark plasma sintering,and systematically analyzed in terms of elemental distribution,phase structure evolution,mechanical properties,and deformation mechanisms.The nanocrystalline powders are mainly composed of body-centered cubic(BCC)and face-centered cubic(FCC)phases after the MA process for 15 h.Upon sintering,the bulk MCAs show a multiphase structure consisting of a fine-grained BCC matrix,two different FCC phases,and a minor V-rich BCC phase.Particularly,the bulk W₅₀Mo₁₀V₅(Fe₆₄Ni₃₆)₃₅MCA sintered at 1250℃for 10 min exhibits an average mass density of 14.94 g·cm^-3,compressive yield strength of 1255 MPa,ultimate strength of 2639 MPa,and fracture strain of 32%at room temperature.Apart from the massive substitutional solid solution strengthening,the multiphase structure contributes significantly to the enhanced strength and deformability.The work thus provides a promising approach for the development of strong and tough high-density materials.