According to the patent "Nickel-base alloy for gas turbine applications" (https://patents.google.com/patent/US9322089B2/en), the density of GTD 111 is 8.3 g/cm3. Hope it helps.
In the data table https://cannonmuskegon.com/products/vacuum-alloys/
GTD-111 is 8.17 g/cm3 (8170 kg/m3).
Composition of the vacuum Equiax alloy is 0.1 C, 14 Cr, 9.5 Co, 1.6 Mo, 3.8 W, 2.8 Ta, 4.9 Ti, 3 Al, 0.012 B, 0.02 Zr, the balance is Ni (60.3). (percentages)