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Phase selection and re-melting-induced anomalous eutectics in undercooled Ni-38 wt% Si alloys.(Original Paper)

Lai, Cun ; Wang, Haifeng ; Pu, Qian ; Xu, Tingting ; Yang, Jinsong ; Zhang, Xi ; Liu, Feng

Journal of Materials Science, 2016, Vol.51(24), p.10990(12) [Tạp chí có phản biện]

ISSN: 0022-2461 ; DOI: 10.1007/s10853-016-0312-y

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  • Nhan đề:
    Phase selection and re-melting-induced anomalous eutectics in undercooled Ni-38 wt% Si alloys.(Original Paper)
  • Tác giả: Lai, Cun ; Wang, Haifeng ; Pu, Qian ; Xu, Tingting ; Yang, Jinsong ; Zhang, Xi ; Liu, Feng
  • Chủ đề: Alloys ; Epitaxy ; Metals (Materials) ; Specialty Metals Industry ; Intermetallic Compounds
  • Là 1 phần của: Journal of Materials Science, 2016, Vol.51(24), p.10990(12)
  • Mô tả: The Ni-38 wt% Si alloy whose eutectic products are two stoichiometric intermetallic compounds (i.e., NiSi and NiSi.sub.2) was undercooled by the melt fluxing technique. After in situ observations of the recalescence processes using a high-speed camera and by electron back-scattering diffraction analysis of the solidification microstructures, the crystal growth velocities, phase selection, and microstructure evolutions were studied. Due to a growth-controlled mechanism, the primary phase changes from the NiSi to the NiSi.sub.2 phase at a critical undercooling [DELTA]T [almost equal to] 48 K. Even in the absence of the driving force of chemical superheating, the transition from regular eutectics to anomalous eutectics happens. The reason is that the single-phase dendrite of NiSi.sub.2 phase solidifies firstly and then the NiSi phase grows epitaxially to form an uncoupled eutectic-dendrite at high undercooling. The present work provides further experimental evidences for the dual origins of anomalous eutectics (e.g., uncoupled eutectic-dendrite growth during the recalescence stage and coupled lamellar eutectic growth at low undercooling during the post-recalescence stage) and is helpful for understanding of non-equilibrium phenomena in undercooled melts.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0022-2461 ; DOI: 10.1007/s10853-016-0312-y

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