Write down the Slip Plane and Slip Direction (one plane and one direction only) of Nickel (only Miller indices). How many slip systems are there in Nickel ?

A Slip Plane and Slip Direction that lies on it together constitute a slip system. For example, the combination (111) and [110] forms a slip system, but not (111) and [110], as the [110] direction does not lie on the (111) plane.

Counting the slip systems for the most densely packed slip planes only, there are 12 slip systems in FCC and BCC crystals for Nickel.