NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The microstructure and tensile properties of extruded melt-spun ribbons of iron-rich B2 FeAlThe microstructure of extruded rods of iron-rich FeAl(B2-structure), as characterized by TEM, SEM, optical microscopy and x-ray diffractometry, consisted of elongated grains with a 111-line fibre texture containing a high dislocation density. Numerous oxide particles were found, mostly in lines which reflected the matrix flow during extrusion. In addition, some large inclusions were present. Tensile testing of annealed, relatively dislocation-free specimens as a function of increasing temperature found increasing ductility up to 900K, above which a ductility drop occurred accompanied by a change in fracture mode, from transgranular cleavage to intergranular fracture. The yield strength, which was independent of temperature up to 800K (at about 500MPa), also decreased rapidly as diffusion became more important. The predominant slip vector changed from 111-line to 100-line around 700K.
Document ID
19880044452
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Baker, I.
(Dartmouth College Hanover, NH, United States)
Gaydosh, D. J.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Subject Category
Metallic Materials
Meeting Information
Meeting: High-temperature ordered intermetallic alloys II
Location: Boston, MA
Country: United States
Start Date: December 2, 1986
End Date: December 4, 1986
Sponsors: MRS, DOE, NASA
Accession Number
88A31679
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available