The ductility of stoichiometric and Ni-rich polycrystals of Ni{sub 3}Al: The effect of strain rate

Book · Wed Dec 31 00:00:00 EST 1997

OSTI ID:571811

Schulson, E M; Xu, Y ^[1]

---

1. Dartmouth Coll., Hanover, NH (United States). Thayer School of Engineering

Polycrystals of stoichiometric Ni{sub 3}Al are brittle in air at room temperature, at least at strain rates from 10{sup {minus}4} s{sup {minus}1} to 7 s{sup {minus}1}. This is indicative of intrinsic brittle behavior. Nickel-rich (Ni24Al) polycrystals, on the other hand, undergo a brittle-to-ductile transition upon raising the strain rate to above about 10{sup {minus}2}s{sup {minus}1}. It is argued that the transition reflects the suppression of environmental embrittlement, not of the intermetallic per se but of a Ni-rich solution that decorates the grain boundaries of the off-stoichiometric alloy.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-86ER45260
• OSTI ID: 571811
• Report Number(s): CONF-961202-; TRN: IM9806%%100
• Resource Relation: Conference: 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996; Other Information: PBD: 1997; Related Information: Is Part Of High-temperature ordered intermetallic alloys VII; Koch, C.C. [ed.] [North Carolina State Univ., Raleigh, NC (United States)]; Liu, C.T. [ed.] [Oak Ridge National Lab., TN (United States)]; Stoloff, N.S. [ed.] [Rensselaer Polytechnic Inst., Troy, NY (United States)]; Wanner, A. [ed.] [Univ. Stuttgart (Germany)]; PB: 799 p.; Materials Research Society symposium proceedings, Volume 460
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL BASE ALLOYS
ALUMINIUM ALLOYS
DUCTILITY
INTERMETALLIC COMPOUNDS
EXPERIMENTAL DATA
BRITTLE-DUCTILE TRANSITIONS