At temperatures between 300 and 650 °C (570
and 1200 °F), an ordered phase of the type
A2B, or, in this case, Ni2(Cr,Mo), occurs by
long-range ordering. The precipitation reaction
is described as being homogeneous, with
no preferential precipitation at the grain
boundaries or twin boundaries. The reaction is
slow at lower temperatures within this range;
it has been established, for example, that it
takes in excess of 38,000 h for A2B to form in
C-276 alloy (N10276) at 425 °C (800 °F).