Solid-liquid interface and growth rate range of Al2O3-based eutectic in situ composites grown by laser floating zone melting

Qun Ren, Haijun Su, Jun Zhang, Bin Yao, Weidan Ma, Lin Liu, Hengzhi Fu, Taiwen Huang, Min Guo, Wenchao Yang

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Directionally solidified Al2O3/Er3Al5O12(EAG) eutectic in situ composites are prepared by laser floating zone melting (LFZM) to investigate the solid-liquid interface characteristic and growth rate range under non-equilibrium solidification conditions. The solid-liquid (S-L) interface is in situ obtained by rapidly quenching, and its microstructure morphology and primary phase based on different eutectic compositions are analyzed. In stable growth zone, the composite presents typically "Chinese script" (CS) irregular eutectic structure consisting of interpenetrated Al2O3 and EAG phases, but in quenched region the regular eutectic lamellae and CS structure are coexisted. Primary Al2O3 phase in hypoeutectic composition is found both in S-L interface front and quenched region. Different from the stable growth zone, in quenched region as the solidification rate increases, the eutectic lamellae spacing does not show obvious decrease. The minimum eutectic lamellae spacing is refined to about 200 nm when the solidification rate is increased up to 100 μm/s. On the basis, according to the Jackson-Hunt (J-H) model, the maximum solidification rate in quenched region is calculated to be smaller than 1.26 × 103 μm/s, and the undercooling degree is 4.15 K.

Original languageEnglish
Pages (from-to)634-639
Number of pages6
JournalJournal of Alloys and Compounds
Volume662
DOIs
StatePublished - 25 Mar 2016

Keywords

  • Eutectic solidification
  • In situ composite
  • Laser floating zone melting
  • Oxide eutectics
  • Solid-liquid interface

Fingerprint

Dive into the research topics of 'Solid-liquid interface and growth rate range of Al2O3-based eutectic in situ composites grown by laser floating zone melting'. Together they form a unique fingerprint.

Cite this