105
The amount of W in both gamma and gamma prime phases
is approximately the same, that is, "homogeneously"
distributed, and consequently about 2.0 atomic % in the
gamma and 2.0% in the gamma prime phase.
Kriege and Baris (1969) measured the partitioning of
Ta and W between the gamma and gamma prime phases of a
number of Ni base alloys, all of which contained
considerable Cr. The Ta ratio between gamma prime and
gamma in numerous Ta containing alloys is approximately
1:4,*05. The ratio between gamma prime and gamma in a
number of W containing alloys (Mar-M200, TRW/900,
Microtung, etc.) is approximately one to one. This is in
close agreement with the present study. The ternary
Ni-Mo-Al compositions of the quaternary alloy gamma and
gamma prime phases are given in Table 5.3.