in volume fraction. It is demonstrated that the disper- sion of nanocrystalline particles significantly enhances the yield stress of amorphous. As expected from Fig. 3 (a) and (b), the dependence of the stress-strain curve on the vol-
ume fraction is almost the same for the diferent particle
sizes. Figure 3 (d) and (e) presents the stress-strain curves
for F(L43R12f10) and G(L43R19f34), respectively. In the figures, average stresses in the amorphous and crys- tal phase are also respectively shown by chained and dot- ted lines. Since crystal growth was not confirmed dur- ing the elongation, the average stresses in amorphous and crystal phases are calculated using the atoms initially con- tained in each phase. When the crystal volume fraction is
low ( f 10%), the stress-strain curve of the crystal phase
bends sharply after yielding in the amorphous phase, and
then the stress slightly increases, as shown by the solid arrow (Fig. 3 (d)). However, the stress-strain curve of the composite is close to the curve of the amorphous phase because the volume fraction is low. On the contrary, when
the crystal volume fraction is high ( f 34%), the stress
of the crystal phase gradually increases until yy 0.2, as
shown by the solid arrow in Fig. 3 (e), although the amor-
phous phase yields at approximately yy = 0.05, and the