High-temperature deformation of B2 NiAl-base alloys
- Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering
- Marko Materials, Inc., North Billerica, MA (United States)
The high-temperature deformation behavior of three rapidly solidified and processed NiAl-base alloys--NiAl, NiAl containing 2 pct TiB[sub 2], and NiAl containing 4 pct HfC--have been studied and their microstructural and textural changes during deformation characterized. Compressions tests were conducted at 1,300 and 1,447 K at strain rates ranging from 10[sup [minus]6] to 10[sup [minus]2] s[sup [minus]1]. HfC-containing material showed dispersion strengthening as well as some degree of grain refinement over NiAl, while TiB[sub 2] dispersoid-containing material showed grain refinement as well as secondary recrystallization and did not improve high-temperature strength. Hot-pack rolling was also performed to develop thin sheet materials (1.27-mm thick) and from these alloys. Without dispersoids, NiAl rolled easily at 1,223 K and showed low flow stress and good ductility during the hot-rolling operation. Rolling of dispersoid-containing alloys was difficult due to strain localization and edge-cracking effects, resulting partly from the high flow stress at the higher strain rate during the rolling operation. Sheet rolling initially produced a [l brace]111[r brace]<112> texture, which eventually broke into multiple-texture components with severe deformation.
- OSTI ID:
- 6935391
- Journal Information:
- Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 25:9; ISSN 0360-2133; ISSN MTTABN
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
BORIDES
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CRYSTAL STRUCTURE
DATA
DEFORMATION
EXPERIMENTAL DATA
HAFNIUM CARBIDES
HAFNIUM COMPOUNDS
INFORMATION
INTERMETALLIC COMPOUNDS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
METALLURGICAL EFFECTS
MICROSTRUCTURE
NICKEL ALLOYS
NUMERICAL DATA
REFRACTORY METAL COMPOUNDS
TESTING
TEXTURE
TITANIUM BORIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS