  As a promising remedy for overcoming the limited ductility and work softening
of bulk metallic glasses (BMGs), BMG composites incorporating a B2 crystalline
phase have attracted considerable attention. Here, we explore the formation of
Zr-Co-Al BMG composites by quenching alloys Zr$_{55}$Co$_{31}$Al$_{14}$,
Zr$_{54.5}$Co$_{33.5}$Al$_{12}$, Zr$_{53.5}$Co$_{36.5}$Al$_{10}$,
Zr$_{52.5}$Co$_{37.5}$Al$_{10}$, and Zr$_{43}$Co$_{43}$Al$_{14}$. We found the
first alloy fully amorphous whereas the fifth was fully crystallized upon
quenching. The other three were quenched to generate composite structures, with
a higher fraction of B2 ZrCo phase with increasing Co/Zr ratio and decreasing
Al content. For comparison, the formation of B2 ZrCo in annealed
Zr$_{55}$Co$_{31}$Al$_{14}$ was also studied. For both approaches the influence
of crystalline phases on hardness was examined.

Materials Science