采用射流铸造法在水冷铜模中制备出成分为Zr52 5Cu30-xNi5 5Al12Nbx(x=0,3)的块体非晶合金.x=0时,样品为完全非晶结构;x=3时,试样的组织为非晶基体上均匀分布着尺度为20 nm的富含Zr和Nb的成分偏聚区,同时富集区内镶嵌着尺寸为5 nm左右bcc结构的Zr-Nb固溶体纳米颗粒.Zr52 5Cu27Ni5.5Al12Nb3合金的强度较具有完全非晶结构的Zr52.5Cu3027Ni5.5Al12合金有明显的提高:断裂强度由1600MPa增加到1964 MPa.非晶基体上析出的纳米颗粒和成分偏聚增加了剪切变形的阻力.同时,基体变形由单滑移(x=0)转变为多滑移(x=3),并且滑移相互交错,避免了由于不均匀形变造成的提前脆断,提高了基体的强度.
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