首页|Microstructure characters of W-based composites with different immiscible second phases prepared by laser powder bed fusion
Microstructure characters of W-based composites with different immiscible second phases prepared by laser powder bed fusion
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NSTL
Elsevier
? 2022 Elsevier B.V.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/α-Cu phases were prone to separate during LPBF. The melted W phase could easily fuse together and form W matrix, and Cu or α-Cu phase distributed within the gaps among W phase. Cu or α-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 α-Cu leads to the relative finer grain size of W phase in W-Cu composite. The heat conduction direction between W phase and Cu/α-Cu also affected the grain morphology. Heat continued transferred from W to Cu/α-Cu induced the columnar grain growth of W, the interlacing distribution of W and Cu/α-Cu made the growth of W columnar grains radiate out from the center Cu/α-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/α-Cu phases, which could effectively reduce the stress degree in W phase during LBPF.
Grain refinementImmiscible second phasesLaser powder bed fusionW matrixW-based composites
Wang B.、Yang Y.、Zhou Z.、He D.、Tan Z.、Wang Y.、Shao W.、Guo X.
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School of Materials Science and Engineering Beijing Institute of Technology
Beijing Center for Physical and Chemical Analysis
Faculty of Materials and Manufacturing Beijing University of Technology
NSTL
Elsevier
