论文部分内容阅读
采用铜模喷铸成形法制备Cu50Zr50、Cu62-xZr38-xAl2 x(2x=2at%、4at%和6at%)和Cu46Zr47-xAl7Yx(x=4at%～7at%)大块非晶试样。通过X射线衍射分析、扫描电子显微镜和示差扫描量热计(DSC)分别研究添加元素Al与Y对Cu-Zr二元合金非晶形成能力、显微形貌和热稳定性的影响。结果表明:所制备的Cu50Zr50、Cu61Zr37Al2为非晶合金,基体中含极少量结晶相,非晶形成能力对Cu-Zr-Al成分较为敏感;Y含量对直径为4 mm的Zr47-xCu46Al7Yx非晶形成能力和显微组织有着显著影响,Y含量4at%时,基体中含极少量结晶相,Y含量5at%～7at%时,非晶合金呈现完全无特征组织。
Cu50Zr50, Cu62-xZr38-xAl2x (2x = 2at%, 4at% and 6at%) and Cu46Zr47-xAl7Yx (x = 4at% ~7at%) bulk amorphous samples were prepared by copper die casting. The effects of Al and Y additions on the amorphous formability, microstructure and thermal stability of Cu-Zr binary alloys were studied by X-ray diffraction, scanning electron microscopy and differential scanning calorimetry (DSC). The results show that the prepared Cu50Zr50 and Cu61Zr37Al2 are amorphous alloys containing a very small amount of crystalline phase and the amorphous formation ability is sensitive to the composition of Cu-Zr-Al. The Y content affects the formation of Zr47-xCu46Al7Yx with a diameter of 4 mm The ability and the microstructure have a significant impact. When the Y content is 4 at%, the matrix contains a very small amount of crystalline phase, and the Y content is 5 at% to 7 at%, the amorphous alloy shows completely non-characteristic structure.