The Research On The Deformation Behavior Of Cu-based Amorophous Alloy In Supercooled Liquid Region

More than half a century, superplastic mechanism of science researchers in materials, metallurgy, mechanical properties and application technology and so on has carried out extensive research. Superplastic research by observing cert-ain metals and alloys of superplastic phenomenon, and further study of the m-echanical properties and deformation mechanism of until the application resear-ch, has come a long time. In the rapid development of modern science and te-chnology in the 21st century, superplastic researchers and other materials work-ers should pay close attention to that superplastic research whether there is any vitality, superplastic theory study how to in-depth, application prospects is go-od or not.In this paper, the preparation of the typical copper base amorphous, probe into its in supercooled liquid region whether has the superplastic deformation behavior, the affecting factors of superplasticity were also studied, for example, deformation temperatures and deformation rates. On this basis, the influence of the fourth component Y element on the mechanical properties of amorphous alloys, especially superplasticity was investigated as well. The results are as follows:Through the successful preparation of suction casting of copper Cu-Zr-Al amorphous, including Cu45Zr47Al8 which has better comprehensive mechanical properties, glass forming ability and impurity of the sample is less. Show that the alloy composition is suitable for supercooled liquid region as the research sample of the study of deformation behavior. XRD testing and metallographic analysis of Cu45Zr47Al8 and (Cu45Zr47Al8)98Y2 show the sample is completely amorphous, amorphous formation ability are good, and (Cu45Zr47Al8)98Y2 is more stable. DSC thermal analysis found that join the Y element can effective-ly increase the wide of supercooled liquid region, but high temperature crystal-lization time is short.Cu45Zr47Al8 alloys for high temperature compression experiment, the temp-erature between Tg and Tx deformation will starting stress overshoot, then stra-in will increase with stress slowly and is not Newtonian fluid deformation, Cu-45Zr47Al8 has good superplasticity. In high temperature especially at 480℃ and 490℃, material in the process of compression stress overshoot phenomenon is not obvious, the Newtonian fluid deformation is uniform, material has good su-perplasticity.