Fabrication of bulk metallic glasses with improved mechanical properties in corrosive aqueous solutions and in cryogenic temperatures

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In general, metallic materials suffer brittle fracture when they are under the combined reactions of tensile stress and specific environments. This phenomenon is called stress corrosion cracking (SCC)and very important from the standpoint of safe designing. Accordingly, we investigated SCC properties of bulk metallic glasses (BMGs)in NaCl solutions. It was found for the first time that Zr_<70> Cu_6Al_8Ni_<16> BMG showed no susceptibility to SCC. The mechanical properties for CuZr-and Ni-based BMGs were also examined at cryogenic temperature (77K). We obtained the new results in which the BMGs possess both high strength and improved plastic train at cryogenic temperatures.