f and volume fraction f . The flow stresses were obtained from the average stress in the range of yy > 0.1. In the fig-
ure, the average flow stresses in the crystal and amorphous
phases are also shown. The flow stress in the amorphous phase is almost independent of the crystal volume fraction. It is considered that the slight increase in the flow stress of the amorphous phase is attributed to the strain rate increase as a result of the volume fraction decrease of the amorphous phase. On the contrary, the flow stress in the crystal phase significantly increases as the crystal vol- ume fraction increases. The enforcement of the flow stress of the composite with the volume fraction increase results from the stress increases in the crystal phase and the in- crease of its fraction. The flow stress of the composite