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采用铜模铸造法制备了Ti35Zr30Be27.5-xCu7.5Cox(x=0,3.5,7.5,11.5)系列块体非晶合金。采用X射线衍射仪(XRD)、万能试验机和扫描电镜(SEM)研究了Co元素添加对Ti-Zr基非晶合金力学性能的影响。结果表明,Co元素适量替代Be元素有利于提高该非晶合金的塑性。当Co含量(摩尔分数)为3.5%时,Ti35Zr30Be24Cu7.5Co3.5块体非晶合金具有最高的断裂强度及塑性应变,分别为2 196MPa和4%;Co含量为7.5%时,非晶合金断裂强度、塑性应变均迅速降低,分别为2 062 MPa和1.5%;进一步增加Co含量至11.5%时,合金的断裂强度又提高到2 106 MPa,而塑性应变仅为0.2%。
Ti35Zr30Be27.5-xCu7.5Cox (x = 0,3.5,7.5,11.5) bulk amorphous alloy was prepared by copper mold casting. The effects of Co addition on the mechanical properties of Ti-Zr-based amorphous alloys were investigated by X-ray diffraction (XRD), universal testing machine and scanning electron microscope (SEM). The results show that the appropriate amount of Co element instead of Be element is conducive to improving the plasticity of the amorphous alloy. When the Co content (mole fraction) is 3.5%, the bulk fracture toughness and plastic strain of Ti35Zr30Be24Cu7.5Co3.5 bulk amorphous alloy are respectively 2 196MPa and 4%; when the content of Co is 7.5%, the amorphous alloy fracture The strength and plastic strain decreased rapidly to 2 062 MPa and 1.5%, respectively. When the content of Co was increased to 11.5%, the fracture strength increased to 2 106 MPa and the plastic strain was only 0.2%.