Forming mechánism of refined granular crystalline of Cu70Ni30 alloy by undercooled solidification

Xuefeng Guo, Feng Liu, Gencang Yang, Jiandong Xing

Research output: Contribution to journalArticlepeer-review

Abstract

Both glass fluxing and cyclic superheating techniques were adopted to effectively undercool the Cu70Ni30 alloy in vacuum. Within the undercooling range of 21 K to 270 K, the microstructure evolution of the alloy was investigated. When the melt was undercooled to ΔT > ΔT″3 (210 K), the grain refinement took place abruptly. Based on the observation of the solidified microstructure, the microchemical-analysis and the calculated results with BCT model, it is found that the secondary grain refinement mechanism consists of two stages. 'The dendrite is, firstly, broken into fragments owing to the stress caused by uneven shrinking during rapid solidification, then the fragments, under the driving force of surface and strain energies, merge through the migration of boundaries, i. e. recrystallization, thus leading to the formation of secondary granular-crystalline.

Original languageEnglish
Pages (from-to)944-945
Number of pages2
JournalProgress in Natural Science: Materials International
Volume10
Issue number12
StatePublished - 2000

Keywords

  • Cuni alloy
  • Dendrite breaking
  • Recrystallization
  • Undercooling

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