SINGLE-CRYSTAL ELASTIC-CONSTANTS OF GAMMA-TIAL

The elastic constants of single-crystal gamma-TiAl (Ti-56O at.% Al) ha ve been measured from 4 to 298 K. The values at 298 K agree with those recently reported by He, Schwarz, Migliori and Whang. c(12) and c(13) are virtually temperature independent while the other elastic constan ts normally decrease with increasing temperature. The values extrapola ted to OK are c(11) = 187GPa, c(33) = 182GPa, c(12) = 74.8 GPa, c(13) = 74.8 GPa, c(44) = 109 GPa and c(66) = 81.2 GPa. The elastic anisotro py factors A(1) = 2c(66)/(c(11)-c(12)), A(2) = 4c(44)/(c(11) + c(33)-2 c(13)) and c(44)/c(66) at OK are virtually equal to those at room temp erature.