NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Microtexture and Nanoindentation Study of Delamination Cracking in Al-Cu-Li-X AlloysCommercial Al-Li alloys have strength and weight advantages over non-Li aluminum alloys. The fracture behavior of these alloys is unusual and has limited their use. The fracture mode, described as delamination, is intergranular, along the broad grain boundaries parallel to the rolling plane of the plate. Microtexture analyses have shown that delaminations occur along boundaries with greater than 30 misorientation. However, it was observed that relatively few of the high angle boundaries exhibited this behavior. Some grains of the retained deformation texture show high internal misorientation, which is a measure of stored strain energy. Delamination tends to occur between these grains and adjacent, recrystallized grains. Nanoindentation studies indicate a higher hardness for the high internal misorientation grains. These results suggest that the delamination could be reduced by processing the alloys to minimize grain-to-grain property disparities.
Document ID
20050240845
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Crooks, R. (National Inst. of Aerospace Hampton, VA, United States)
Domack, M. S. (NASA Langley Research Center Hampton, VA, United States)
Wagner, J. A. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2005
Subject Category
Metals And Metallic Materials
Meeting Information
Meeting: Materials Charaterization 2005
Location: Portland ME
Country: United States
Start Date: November 2, 2005
End Date: November 4, 2005
Funding Number(s)
OTHER: 23-794-40-4L
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available