The effect of low cooling rates on dendrite morphology during directional solidification in Mg-Gd alloys: In situ X-ray radiographic observation

Yongbiao Wang*, Liming Peng, Yanzhou Ji, Xiaoxing Cheng, Nan Wang, Yan Zhao, Yanan Fu, Long Qing Chen, Wenjiang Ding

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The real time microstructure evolutions of directional solidification in Mg-Gd alloys are obtained by synchrotron X-ray radiography, and the effects of different low cooling rates under a fixed thermal gradient are studied. Different from the organic alloys, the growth direction of columnar dendrites gradually rotates to the direction of the thermal gradient as the cooling rates increase, which is attributed to the difference of undercooling. Meanwhile, the interface velocity increases but the mean dendrite spacing decreases, and the morphology varies with implication for solute segregation.

Original languageEnglish
Pages (from-to)218-221
Number of pages4
JournalMaterials Letters
Volume163
DOIs
StatePublished - 15 Jan 2016
Externally publishedYes

Keywords

  • Cooling rates
  • Directional solidification
  • Growth direction
  • Mg-Gd alloys
  • X-ray radiography

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