Influence of Precipitation Behavior of Different Crystalline Phases for Embrittlement Behavior of Several Zr-Based Metallic Glasses

抄録

We have examined difference in embrittlement behavior of characteristic Zr-based metallic glasses of Zr₅₅Cu₃₀Al₁₀Ni₅, Zr₅₉Cu₃₁Al₁₀ and Zr₆₅Cu_17.5Ni₁₀Al_7.5. All of the metallic glasses are embrittled with the precipitation of crystalline phases, and the crystalline phases for the Zr₅₅Cu₃₀Al₁₀Ni₅ metallic glass change in annealing temperatures of T_g-15 K and T_x-50 K. The embrittlement behavior is relating well with the behavior of the precipitated crystalline phases and is caused with step-wise process when the several kinds of crystalline phases are precipitated continuously and complexly. The precipitation of crystalline seems to relate to formation of shear band with the embrittlement behavior. Especially, CuZr₂ phase causes much shear band near fracture point with bending test.