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The study of local plastic strain in nickel-based superalloys by selected area channeling patterns in the STEM

Authors
Journal
Metallography
0026-0800
Publisher
Elsevier
Publication Date
Volume
13
Issue
3
Identifiers
DOI: 10.1016/0026-0800(80)90002-6
Disciplines
  • Computer Science
  • Mathematics

Abstract

Abstract It is shown that selected area channeling patterns (SACPs) of high quality may be obtained from two nickel-based superalloys (namely Nimonic 90 and Mar-M246) by employing, in the scanning mode of operation, a JEM 100C electron microscope with TEMSCAN attachment, using an accelerating voltage of 100 kV. Both differentiated signal processing and mode dc were used to observe the channeling patterns. The effect of specimen plastic strain upon the SACPs has been analyzed, and by using a plot of (h 2 + k 2 + l 2) for the highest order line indexable in the Nimonic 90 material, a systematic deterioration in SACP quality with strain has been demonstrated. For unidirectionally solidified Mar-M246 the variation in line width [for different (hkl) lines] was followed for specimens subjected to increasing strain. This demonstrated a linear variation for the lines measured. The technique has been used to map the plastically strained area around a fatigue crack in Nimonic 90.

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