Studies of initial oxidation of nickel-chromium alloys: Surface annealing by hydrogen ion bombardment

N. S. McIntyre, L. Kover, T. C. Chan

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Nickel-18% chromium binary alloy and alloy 600 (77% Ni, 16% Cr, 8% Fe) have been oxidized at 600 °C for periods of several minutes under 02 pressures of < 10–6to 10 -4Torr 02. The polycrystalline surfaces were pretreated by ion bombardment with 5 kV hydrogen ions. The oxide structure developed thereafter is found to be strongly influenced by grain orientation. One major grain orientation produced a chromium-rich surface oxide, while a second orientation gave rise to a surface oxide with a high nickel concentration. On some grain surfaces, a repetitive pattern of nodule oxide growth was observed with a structural pattern which is peculiar to a specific grain orientation. On surfaces remote from H+ bombarded areas, initial surface oxide composition is more governed by local stresses which develop along scratches. It is argued that alloy surface pretreatment with H+ anneals local mechanical stresses and allows substrate crystallographic orientation effects to become important.

Original languageEnglish
Pages (from-to)1866-1874
Number of pages9
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume4
Issue number4
DOIs
Publication statusPublished - Jul 1986

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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