Accession Number N20120012545
Title Improvement of GRCop-84 Through the Addition of Zirconium.
Publication Date Jun 2012
Media Count 42p
Personal Author B. A. Lerch D. L. Ellis
Abstract GRCop-84 (Cu-8 at.% Cr-4 at.% Nb) has excellent strength, creep resistance, low cycle fatigue (LCF) life and stability at elevated temperatures. It suffers in comparison to many commercially available precipitation-strengthened alloys below 500 C (932 F). It was observed that the addition of Zr consistently improved the mechanical properties of Cu-based alloys especially below 500 C. In an effort to improve the low temperature properties of GRCop-84, 0.35 wt.% Zr was added to the alloy. Limited tensile, creep, and LCF testing was conducted to determine if improvements occur. The results showed some dramatic increases in the tensile and creep properties at the conditions tested with the probability of additional improvements being possible through cold working. LCF testing at room temperature did not show an improvement, but improvements might occur at elevated temperatures.
Keywords Aging(Metallurgy)
Analysis of variance
Chemical composition
Copper alloys
Creep tests
Fatigue tests
Heat treatment
Intermetallics
Mechanical properties
Photomicrography
Room temperature
Stress-strain relationships
Tensile tests
Zirconium


 
Source Agency National Aeronautics and Space Administration
NTIS Subject Category 71N - Nonferrous Metals & Alloys
Corporate Author National Aeronautics and Space Administration, Cleveland, OH. NASA John H. Glenn Research Center at Lewis Field.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1303
Contract Number N/A

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