The elastic energy dissipation and dynamic modulus of several intermetallic
compounds with the NiAl (B2) and Ni3Al (L1(2)) composition and different g
rain sizes were measured. The grain dimensions were deduced by XRD data ana
lysis. These alloys exhibit a temperature increasing background damping whi
ch raises faster as the grain size enter the nanometric regime. The elastic
modulus of out of stoichiometry single crystals increases up to 20 % with
temperature in a reproducible manner. (C) 1999 Acta Metallurgica Inc.