Effect of growth rate on microstructure and microstructure evolution of directionally solidified Nb-Si alloys

Yoshihito Sekito, Seiji Miura, Kenji Ohkubo, Tetsuo Mohri, Norihito Sakaguchi, Seiichi Watanabe, Yoshisato Kimura, Yoshinao Mishima

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)

Abstract

In the present work, Nb-18.1Si-1.5Zr alloy rods are produced with a growth rate ranging from 1.5 to about 1500 mm/h using the optical floating zone (OFZ) furnace. A part of each specimen is heat-treated at 1650 °C for 100 h. The microstructure was observed using SEM and TEM and analyzed using EPMA and EBSD. Eutectic-cells are observed in as-grown specimens with a growth rate of 150 mm/h or higher. It is found by EBSD analysis that the solidification direction of Nb is along <113> and that of Nb 3Si is along <001], and {112} of Nb and {110) of Nb 3Si are parallel. The present crystallographic orientation relationship between Nb and Nb 3Si is different from that found in previous reports by several researchers. It was also confirmed that the heat-treated microstructure in the specimen grown by OFZ with a growth rate of 150 mm/h is similar to that in the heat-treated specimen prepared by arc-melting.

Original languageEnglish
Pages (from-to)281-286
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume1128
Publication statusPublished - 2009 Nov 17
Event2008 MRS Fall Meeting - Boston, MA, United States
Duration: 2008 Dec 22008 Dec 5

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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