High resolution electron microscopic study of the ordering processes in Ni4Mo alloy

K. H. Lee, K. Hiraga, D. Shindo, M. Hirabayashi

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20 Citations (Scopus)

Abstract

We have studied the ordering processes of a Ni-20.1at.%Mo alloy using the many-beam imaging technique with the aid of an image processing method. No microdomain is detected in high resolution electron micrographs of the alloy quenched from 1000°C, but lattice modulations which probably be attributed to concentration waves appear parallel to the {210} planes at the initial ordering stage. It is revealed that the observed contrasts of D1a-type and D022-type microdomains are apparently formed with superpositions of different pairs of the {210} lattice modulations. When the alloy is annealed at 650°C for 192 h, Ni2Mo domains appear in between the Ni4Mo domains, and their composition is determined to be the stoichiometry (32at.%Mo) by the energy dispersive X-ray (EDX) analysis. The superstructure images of Ni4Mo and Ni2Mo are discussed in comparison with computer simulations by the multislice method.

Original languageEnglish
Pages (from-to)641-649
Number of pages9
JournalActa Metallurgica
Volume36
Issue number3
DOIs
Publication statusPublished - 1988 Mar

ASJC Scopus subject areas

  • Engineering(all)

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