Crystallization and microstructure changes in rapidly solidified Nb20Ti40Ni40 hydrogen permeation alloy

Mitsuhiro Matsuda, Yusuke Shimada, Takuya Murasaki, Minoru Nishida, Kazuhiro Ishikawa, Kiyoshi Aoki

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12 Citations (Scopus)

Abstract

The crystallization behaviors and microstructure changes by heat treatments in the rapidly solidified Nb20Ti40Ni40 hydrogen permeation alloy have been investigated. There are two exothermic peaks at 872 and 914 K in DSC heating curve. The first and second peaks correspond to the crystallization of B2-TiNi and bcc-Nb phases, respectively. The orientation relationship of these two phases is cube-on-cube relation. The specimens annealed from 773 to 923 K are quite brittle, although those microstructures consist of fine equiaxed grains less than 50 nm. With prolonged annealing above 948 K the grain size is increased to about 150 nm or more and the hardness is decreased around 250 Hv, thus the ductility is recovered. These results suggest that the high temperature annealing is required for the application of the melt-spun ribbon to the hydrogen permeation membrane.

Original languageEnglish
Pages (from-to)773-777
Number of pages5
JournalJournal of Alloys and Compounds
Volume485
Issue number1-2
DOIs
Publication statusPublished - Oct 19 2009

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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