ternary peritectic alloy, metastable immiscibility, rapid solidification, reduced gravity, liquid phase separation Since the 1990s, an outstanding giant magnetoresistance effect has been discovered in some peritectic alloys, such as Cu-Co, Cu-Co-Ni, Cu-Fe-Co, and so on. However, these alloys show a metastable miscibility gap in the undercooled state. During solidification, the uniform alloy melt tends to separate into two liquids with different compositions if undercooling exceeds the corresponding critical value. The metastable miscibility and rapid solidification of such alloys have attracted extensive interest in the field of both condensed matter physics and materials science [1][2][3][4] . In 1958, Nakagawa [5] observed the metastable liquid phase separation in Cu-Co and Cu-Fe alloys when measuring their magnetic susceptibility during successive cooling. He found that the uniform alloy melts separated into a Co-rich (or Fe-rich) and a Cu-rich liquid phase under the large undercooling
Stress-induced viscous flow is the characteristic of atomic movements during plastic deformation of metallic glasses in the absence of substantial temperature increase, which suggests that stress state plays an important role in mechanically induced crystallization in a metallic glass. However, it is poorly understood. Here, we report on the stress-induced localized crystallization in individual shear bands of Zr60Al15Ni25 metallic glass subjected to cold rolling. We find that crystallization in individual shear bands preferentially occurs in the regions neighboring the amorphous matrix, where the materials are subjected to compressive stresses demonstrated by our finite element simulations. Our results provide direct evidence that the mechanically induced crystallization kinetics is closely related with the stress state. The crystallization kinetics under compressive and tensile stresses are interpreted within the frameworks of potential energy landscape and classical nucleation theory, which reduces the role of stress state in mechanically induced crystallization in a metallic glass.
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