Abstract
We have clarified relation between embrittlement behavior and crystallization or structural relaxation behavior of Zr55Cu30Al10Ni5 and Ti47.4Cu42Zr5.3TM5.3(TM = Ni, Co, Fe) metallic glasses. The embrittled samples were prepared by isothermal annealing at various temperatures and times. The embrittlement behavior of the metallic glasses was compared with the crystallization and structural relaxation behavior estimated by kinetic calculation. In the present study, we have clarified as follows, (1) The Zr55Cu30Al10Ni5 metallic glass becomes brittle with precipitation of crystal, and the behavior agrees with the kinetic calculation of crystallization. (2) The Ti47.4Cu42Zr5.3Ni5.3 metallic glass is embrittled with structural relaxation, and the behavior agrees with the kinetic calculation using DSC-heat flow of glass transition. (3) The Ti47.4Cu42Zr5.3TM5.3(TM = Co, Fe) metallic glasses are also embrittled with structural relaxation, although embrittlement behavior of these glasses is influenced more sensitively by the structural relaxation compared with the Ti47.4Cu42Zr5.3Ni5.3metallic glass.
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