Irradiation-induced amorphization and elastic shear instability in intermetallic compounds

Conference · Sun Jan 01 04:00:00 EST 1989

DOI:https://doi.org/10.1557/PROC-157-777· OSTI ID:5214569

Koike, J ^[1]; Okamoto, P R; Rehn, L E; Bhadra, R; Grimsditch, M H ^[2]; Meshii, M ^[3]

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1. Argonne National Lab., IL (USA) Northwestern Univ., Evanston, IL (USA). Dept. of Materials Science and Engineering
2. Argonne National Lab., IL (USA)
3. Northwestern Univ., Evanston, IL (USA). Dept. of Materials Science and Engineering

Previously we reported a substantial ({approximately}50%) decrease in shear modulus prior to amorphization in Kr irradiated Zr{sub 3}Al, and proposed that amorphization is triggered when the crystalline lattice becomes unstable against shear stress. In the present work, the relation between amorphization and shear elastic instability has been investigated in two additional compounds (FeTi and NiAl) during room temperature irradiation with 1.7-MeV Kr{sup +}. A shear modulus was measured using Brillouin scattering; structural information was obtained in situ in a high voltage electron microscope interfaced to a tandem accelerator. During irradiation of FeTi, chemical disordering and a large ({approximately}40%) decrease of shear modulus were observed, and an amorphous phase developed subsequently. In contrast, NiAl remained crystalline and chemically ordered during irradiation, and exhibited only a {approximately}10% decrease in shear modulus. Hence, these two results provide further support that a shear instability triggers irradiation-induced amorphization. The shear instability mechanism may also apply to other solid-state amorphization techniques, e.g., hydrogen charging and mechanical deformation. 22 refs., 3 figs.

• Research Organization: Los Alamos National Lab., NM (USA)
• Sponsoring Organization: DOE/DP; NSF
• DOE Contract Number: W-7405-ENG-36; W-31109-ENG-38
• OSTI ID: 5214569
• Report Number(s): LA-UR-89-4160; CONF-891119--47; ON: DE90004845; CNN: DMR-8411178
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360106* -- Metals & Alloys-- Radiation Effects
ALLOYS
ALUMINIUM ALLOYS
AMORPHOUS STATE
INTERMETALLIC COMPOUNDS
IRON ALLOYS
IRRADIATION
NICKEL ALLOYS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
SHEAR
TITANIUM ALLOYS
ZIRCONIUM ALLOYS
ZIRCONIUM BASE ALLOYS