ANALYSIS OF THE FRACTURE-BEHAVIOR OF AN ALUMINIDE COATING ON A SINGLE-CRYSTAL SUPERALLOY UNDER TENSILE CONDITIONS

Authors
ANTELO MA JOHNSON PK OSTOLAZA KM BRESSERS J
Citation
Ma. Antelo et al., ANALYSIS OF THE FRACTURE-BEHAVIOR OF AN ALUMINIDE COATING ON A SINGLE-CRYSTAL SUPERALLOY UNDER TENSILE CONDITIONS, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 247(1-2), 1998, pp. 40-50
Citations number
19
Categorie Soggetti
Material Science
Journal title
Materials science & engineering. A, Structural materials: properties, microstructure and processing → ACNP
ISSN journal
09215093
Volume
247
Issue
1-2
Year of publication
1998
Pages
40 - 50
Database
ISI
SICI code
0921-5093(1998)247:1-2<40:AOTFOA>2.0.ZU;2-W
Abstract
The fracture behaviour of an aluminide coating applied to the single-c rystal nickel-based superalloy SRR99 was studied under monotonic loadi ng conditions. A set of tensile tests were carried out in order to det ermine the fracture strain of the coating as a function of the tempera ture. During testing, images of the sample surface were periodically c aptured by means of a video camera system. Analysis of the images has led to the establishment of a value of the coating fracture strain and to a simple method for examining displacements in the coating plane. The observed coating cracking is preceded by substrate yielding, hence the fracture behaviour of the coating has been rationalised in terms of substrate crystal orientation, its yielding behaviour and strain co ncentration. (C) 1998 Elsevier Science S.A. All rights reserved.