Microstructure development during pack aluminization of nickel and nickel-chromium wires

Dinc Erdeniz*, David C. Dunand

*Corresponding author for this work

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

Pack aluminization - a chemical vapor deposition process widely used to form protective coatings on Ni-based superalloy components - was used to form shells of Ni2Al3, NiAl and/or γ′-Ni 3Al on the surface of γ-Ni wires with diameters of 127 μm. The growth kinetics of these Al-rich intermetallic shells are studied as a function of aluminization time and pack activity at 1000 C. Similar kinetics but additional phases (Cr/Ni two-phase shell, Cr silicide particles and Al-rich particles distributed in Ni2Al3) are found in the shells of pack-aluminized Ni-20 wt.% Cr wires with similar diameters. Fully homogenous Ni-Al and Ni-Cr-Al wires are achieved by interdiffusion at 1200 C between the deposited Al-rich intermetallic shells and the Ni-rich core of both types of wires. Upon subsequent aging at 900 C, wires with γ/γ′ structure and high hardness indicative of precipitation strengthening are obtained.

Original languageEnglish (US)
Pages (from-to)43-53
Number of pages11
JournalIntermetallics
Volume50
DOIs
StatePublished - Jul 2014

Keywords

  • A. Intermetallics
  • B. Age-hardening
  • B. Diffusion
  • C. Coatings
  • D. Microstructure

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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