  The {\mu}-phase is a common precipitation phase in superalloys and it exists
in a wide composition and temperature range. As such, we study the influences
of composition and temperature on its plasticity by micropillar compression
tests and transmission electron microscopy. The micropillars of the
{\mu}-Co7Nb6 phase deform plastically by basal slip at either room temperature
or 600 oC. At room temperature, the Co-49Nb and Co-52Nb micropillars show high
yield stresses and an abrupt large strain burst at the onset of yielding
regardless of orientation, whereas the Co-54Nb micropillars oriented for basal
slip yield at much lower stresses and show intermittent small strain bursts
during plastic deformation. While the Co-49Nb micropillars deform by full
dislocation slip on the basal plane at room temperature, the Co-54Nb
micropillars deform by partial dislocation slip on the basal plane. At 600 oC,
the Co-49Nb micropillars oriented for basal slip show stable and continuous
plasticity and their critical resolved shear stress decreases dramatically. The
plastic deformation of the Co-49Nb micropillars occurs via partial dislocation
slip on the basal plane at 600 oC. Based on the geometric {\gamma}-surfaces for
all potential basal slip planes, we explore where and why the glide of full and
partial dislocations on the basal plane occurs in the {\mu}-Co7Nb6 phase.
