文献类型：期刊文献

英文题名：Strengthening and deformation mechanisms of laser additively manufactured Ni2CoCrNb0.2V0.2 medium-entropy alloy: Cryogenic to elevated temperatures

作者：Wang, Fangping Huang, Fang Guo, Yaxiong Liu, Qibin Liao, Tianhai

第一作者：Wang, Fangping

机构：[1] College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China; [2] Guiyang Vocational and Technical College, Guiyang, 550081, China; [3] Guizhou Institute of Technology, Guiyang, 550003, China; [4] Key Laboratory for Modern Manufacturing Technology of Educational Ministry, Guiyang, 550025, China

第一机构：College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China

通信机构：College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China

年份：2024

卷号：93

外文期刊名：Additive Manufacturing

收录：EI(收录号：20240106648);Scopus(收录号：2-s2.0-85204369921)

语种：英文

外文关键词：Cobalt alloys - Cryogenics - Entropy - Nickel alloys - Tensile strength

摘要：To develop a medium-entropy alloy (MEA) with a high yield strength at temperatures ranging from cryogenic (-196 ℃) to elevated (800 ℃) temperatures, a strategy for strengthening nanoparticle precipitation while reducing the MEA stacking fault energy (SFE) is proposed. A novel Ni2CoCrNb0.2V0.2 MEA suitable for additive manufacturing (AM) was designed according to the first-principles calculations and the calculation of phase diagrams (CALPHAD) technique. Bulk MEA samples were printed using laser-directed energy deposition (LDED) with a vibration field. First-principles calculations indicated that V addition could reduce the SFE and stabilize the γ′′ strengthening phase. The aged MEA had excellent yield strengths of ～1398 MPa and ～751 MPa at ?196 ℃ and 650 ℃, respectively. The specific strength of the MEA reached 94.16 MPa g?1 cm?3 at 650 ℃. The deformational mechanism transforms from stacking fault (SF), deformation twin (DT), and Lomer–Cottrell (L-C) lock synergy to slip-dominated plasticity when the tensile temperature increases from ?196 ℃ to 800 ℃. This research provides new theoretical guidance for developing AM-ed MEAs with an ultrastrong combination of strength and ductility for extreme temperatures applications. ? 2024