Microstructure evolution in laser solid forming of Ti-50 wt% Ni alloy

Xiaojing Xu, Xin Lin, Mocong Yang, Jing Chen, Weidong Huang

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

Ti-50 wt% Ni alloys were fabricated by laser solid forming (LSF) using pure Ti and Ni powders. Effects of laser process parameters (laser power and scanning speed) on the deposited microstructures were investigated. With increasing scanning velocity and decreasing laser power, as-deposited microstructure exhibited an evolution from primary TiNi dendrite to two-phase TiNi + B2 dendrite and finally to TiNi + Ti2Ni anomalous eutectic, meantime, the characteristic size of the dendritic arms also decreased. The experimental results were further compared with the model of Trivedi, Magnin, Kurz (TMK model) of eutectic growth and Kurz, Giovanola, Trivedi (KGT model) of dendrite growth. The experimental results are in a reasonable agreement with KGT model.

Original languageEnglish
Pages (from-to)782-787
Number of pages6
JournalJournal of Alloys and Compounds
Volume480
Issue number2
DOIs
StatePublished - 8 Jul 2009

Keywords

  • Laser processing
  • Metals and alloys
  • Phase transitions
  • Rapid-solidification

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