NDLI: Observations of static strain-aging in polycrystalline nial

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Observations of static strain-aging in polycrystalline nial

Content Provider	NASA Technical Reports Server (NTRS)
Author	Noebe, R. D. Lewandowski, J. J. Oliver, B. F. Weaver, M. L. Kaufman, M. J.
Copyright Year	1996
Description	Static strain-aging has been investigated in eight polycrystalline NiAl alloys. After annealing at 1100 K for 7200 s followed by furnace cooling, high-purity, nitrogen-doped, and titanium-doped alloys exhibited continuous yielding, while conventional-purity and carbon-doped alloys exhibited distinct upper yield points and Luders strains. Either water quenching from 1100 K or prestraining via hydrostatic pressurization suppressed the yield points in the latter alloys, but they could be reintroduced by further annealing treatments. Yield points could be reintroduced more rapidly if the specimens were prestrained uniaxially rather than hydrostatically, owing to the arrangement of dislocations into cell structures during uniaxial deformation. Chemical analysis suggests that the species responsible for strain-aging is interstitial carbon.
File Size	1185676
Page Count	10
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19970020093
Archival Resource Key	ark:/13960/t6d26vn00
Language	English
Publisher Date	1996-02-02
Access Restriction	Open
Subject Keyword	Metallic Materials Titanium Alloys Annealing Yield Point Aluminum Alloys Interstitials Polycrystals Nickel Carbon Prestressing 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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