Slip, twinning, and transformation in Laves phases. Final technical report, 1 August 1990--January 31, 1997

Technical Report · Mon Jun 01 04:00:00 EDT 1998

DOI:https://doi.org/10.2172/663579· OSTI ID:663579

Allen, S M

Currently, intermetallic compounds are being studied as potential high-temperature structural materials. Most of these studies are on phases such as Ni{sub 3}Al, TiAl, NiAl, and Ti{sub 3}Al, which have structures that are crystallographic derivatives of fcc, bcc, or hcp structures. However, most intermetallics have more complex crystal structures, and little is known about their deformation mechanisms and mechanical properties. By far the largest class of such compounds is that of the Laves phases, AB{sub 2} compounds having three different crystal structures: C15 (cubic), C14 (hexagonal), and C36 (dihexagonal). This research program explored room-temperature compressive deformation of two-phase alloys containing substantial amounts of Laves phase, and, by transmission electron microscopy, characterized the deformation-induced defects in these alloys. The results include: transmission electron microscopy analysis of defect structures to determine deformation mechanisms, use of indentation experiments to gain deeper understanding of deformation mechanisms, systematic study of effects of ternary alloying additions on mechanical properties, and assessment of effects of departure from stoichiometry on phase stability and mechanical properties of Laves phases.

• Research Organization: Massachusetts Inst. of Tech., Cambridge, MA (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: FG02-90ER45426
• OSTI ID: 663579
• Report Number(s): DOE/ER/45426--T1; ON: DE98006509
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPRESSION STRENGTH
CRYSTAL-PHASE TRANSFORMATIONS
HARDNESS
INTERMETALLIC COMPOUNDS
LAVES PHASES
MICROSTRUCTURE
PROGRESS REPORT
SLIP
STACKING FAULTS
TWINNING