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摘要:
W-based composites with the different immiscible second phases (Cu and Cu10Sn) were prepared by laser powder bed fusion (LPBF). The immiscible W phase and Cu/alpha-Cu phases were prone to separate during LPBF. The melted W phase could easily fuse together and form W matrix, and Cu or alpha-Cu phase distributed within the gaps among W phase. Cu or alpha-Cu phase can provide a gradient cooling way for the solidification of W phase through the transformation of 'solid-liquid-gas' during LPBF. The evaporation of Cu or Sn accelerated the heat dissipation, which caused the grain refinement of W. Higher thermal conductivity of Cu than alpha-Cu leads to the relative finer grain size of W phase in W-Cu composite. The heat conduction direction between W phase and Cu/alpha-Cu also affected the grain morphology. Heat continued transferred from W to Cu/alpha-Cu induced the columnar grain growth of W, the interlacing distribution of W and Cu/alpha-Cu made the growth of W columnar grains radiate out from the center Cu/alpha-Cu phase. Remarkable, cracks were severely restrained in W phase simultaneously although W phase melted completely. This is not only related to improvement of strength and ductility of W caused by grain refinement, but also because of the interlacing distribution of W and Cu/alpha-Cu phases, which could effectively reduce the stress degree in W phase during LBPF.(c) 2022 Elsevier B.V. All rights reserved.
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来源 :
JOURNAL OF ALLOYS AND COMPOUNDS
ISSN: 0925-8388
年份: 2022
卷: 926
6 . 2
JCR@2022
6 . 2 0 0
JCR@2022
ESI学科: MATERIALS SCIENCE;
ESI高被引阀值:66
JCR分区:1
中科院分区:1
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