HREM Observation of the Interface between Laves-phases and Matrix Phases in Inconel 718 by Using a High-voltage Electron Microscope

Masayuki Segawa, Akira Taniyama, Daisuke Shindo

Research output: Contribution to journalArticlepeer-review

Abstract

The Ni-base alloy, Inconel 718 was observed with high-resolution electron microscopy using by a high-voltage electron microscope in order to analyze the morphology of the interface between Laves-phases and the austenite matrix phases. The Laves-phase had a plate shape and had a (004)Laves∥ {111}γ; [11̄0]Laves∥ <110>γ relationship in the interface with the matrix (γ). The interface had the step-structure although the interface looked like a planar shape macroscopically. It was considered that the step-structures were introduced to relax the lattice strain between the Laves-phases and the matrix. The step-structures were observed at intervals of almost 11.4-40.4 nm and 2.3-9.6 nm in the samples aged at 1 073 and 1 123 K, respectively. It was considered that the decrease of the interval of step-structure was due to the increase of the lattice strain between the Laves-phases and the matrix with increasing the aging temperature from 1 073 to 1 123 K.

Original languageEnglish
Pages (from-to)1375-1378
Number of pages4
JournalIsij International
Volume38
Issue number12
DOIs
Publication statusPublished - 1998 Jan 1

Keywords

  • High-resolution electron microscopy
  • High-voltage electron microscope
  • Inconel 718
  • Interface
  • Laves-phase
  • Step-structure

ASJC Scopus subject areas

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

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