The structure and properties of grain boundaries in B2 ordered alloys: Progress report

Technical Report · Fri Apr 21 04:00:00 EDT 1989

DOI:https://doi.org/10.2172/6227765· OSTI ID:6227765

Baker, I.

This report covers the period from April 1st 1988 to March 30th 1989. During this period a number of fine-grained alloys of FeAl and NiAl with different aluminum contents were produced by multiple hot extrusion. Thus far, researchers have characterized the extruded microstructures of the alloys; initiated mechanical testing which confirms that with increasing deviation from stoichiometry the yield strength of FeAl decreases while that for NiAl increases and which shows the grain boundary strengthening in NiAl decreases with increasing deviation from stoichiometry; performed grain growth studies of NiAl and FeAl. For FeAl alloys it was found that grain growth is more rapid in the iron-rich composition; continued an atom probe field ion microscope (APFIM) study of the grain boundary chemistry of NiAl with Dr. M.K. Miller at Oak Ridge National Laboratory; studied boundary chemistry in near-stoichiometric NiAl and FeAl using scanning Auger electron spectroscopy at Oak Ridge National laboratory, with the aid of Mr. R.A. Padgett, Jr. and initiated in-situ straining experiments in the transmission electron microscope (TEM) to examine dislocation/grain boundary interactions. 6 figs., 1 tab.

• Research Organization: Dartmouth Coll., Hanover, NH (USA). Thayer School of Engineering
• DOE Contract Number: FG02-87ER45311
• OSTI ID: 6227765
• Report Number(s): DOE/ER/45311-2; ON: DE89013266
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
DOCUMENT TYPES
ELECTRON MICROSCOPY
EXTRUSION
FABRICATION
GRAIN BOUNDARIES
GRAIN GROWTH
INTERMETALLIC COMPOUNDS
ION MICROSCOPY
IRON ALLOYS
IRON BASE ALLOYS
LINE DEFECTS
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
OXIDATION
PROGRESS REPORT
STOICHIOMETRY
TRANSMISSION ELECTRON MICROSCOPY
YIELD STRENGTH