NDLI: Creep of uncoated and cu-cr coated narloy-z

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Creep of uncoated and cu-cr coated narloy-z

Content Provider	NASA Technical Reports Server (NTRS)
Author	Walter, R. J. Chiang, K. T.
Copyright Year	1998
Description	Stress rupture creep tests were performed on uncoated and Cu-30vol%Cr coated NARloy-Z copper alloy specimens exposed to air at 482 C to 704 C. The results showed that creep failure in air of unprotected NARloy-Z was precipitated by brittle intergranular surface cracking produced by strain assisted grain boundary oxidation (SAGBO) which in turn caused early onset of tertiary creep. For the protected specimens, the Cu-Cr coating remained adherent throughout the tests and was effective in slowing down the rate of oxygen absorption, particularly at the higher temperatures, by formation of a continuous chromium oxide scale. As the result of reducing oxygen ingress, the coating prevented SAGBO initiated early creep failure, extended creep deformation and increased the creep rupture life of NARloy-Z over the entire 482 C to 704 C test temperature range.
File Size	942355
Page Count	16
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19980201213
Archival Resource Key	ark:/13960/t59d1w50g
Language	English
Publisher Date	1998-01-01
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Test Ranges Grain Boundaries Creep Properties Oxygen Deformation Structural Failure Brittleness Creep Tests Chromium Oxides Copper Alloys Oxidation Protective Coatings Surface Cracks Stress Measurement Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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