Enhanced mechanical and arc erosion resistant properties by homogenously precipitated nanocrystalline fcc-Nb in the hierarchical W-Nb-Cu composite
作者： Longchao Zhuo , Zhao Zhao , Zhicong Qin , Qiuyu Chen , Shuhua Liang
DOI: 10.1016/J.COMPOSITESB.2018.11.025
关键词: Grain size 、 Composite material 、 Electron backscatter diffraction 、 Composite number 、 Nanocrystalline material 、 Work function 、 Phase (matter) 、 Sintering 、 Materials science 、 Microstructure
摘要: Abstract To achieve a combined enhancement of mechanical properties with improved arc erosion resistance, novel strategy two-step ball-milling and hot-press sintering under hydrogen for fabricating hierarchical W-Nb-Cu composite reinforced in-situ nanocrystalline fcc-Nb was advocated. Characteristics including phase constituents, microstructure, behavior the W-3 wt.%Nb-30 wt.%Cu have been systematically investigated. The crystal structure, grain size distributions, as well specified surface work function three components W, Cu Nb were identified by XRD, TEM, EBSD experiments DFT calculation. enhanced considered to result from refinement W gradient micron ultrafine scale, interfacially precipitated fcc-Nb, which also acted first breakdown effective dissipation energies.
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