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Microstructural Characterization of Aluminum-Lithium Alloys 1460 and 2195Transmission electron microscopy (TEM) and differential scanning calorimetry (DSC) techniques were employed to characterize the precipitate distributions in lithium-containing aluminum alloys 1460 and 2195 in the T8 condition. TEM examinations revealed delta prime and T1 as the primary strengthening precipitates in alloys 1460 and 2195 respectively. TEM results showed a close similarity of the Russian alloy 1460 to the U.S. alloy 2090, which has a similar composition and heat treatment schedule. DSC analyses also indicate a comparable delta prime volume fraction. TEM study of a fractured tensile sample of alloy 1460 showed that delta prime precipitates are sheared by dislocations during plastic deformation and that intense stress fields arise at grain boundaries due to planar slip. Differences in fracture toughness of alloys 1460 and 2195 are rationalized on the basis of a literature review and observations from the present study.
Document ID
19980017087
Acquisition Source
Langley Research Center
Document Type
Contractor Report (CR)
Authors
Wang, Z. M. (Analytical Services and Materials, Inc. Hampton, VA United States)
Shenoy, R. N. (Analytical Services and Materials, Inc. Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1998
Subject Category
Metallic Materials
Report/Patent Number
NASA/CR-1998-206914
NAS 1.26:206914
Funding Number(s)
PROJECT: RTOP 242-20-05-05
CONTRACT_GRANT: NAS1-96014
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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