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采用真空熔炼制备不同成分(Zr_(50)Ti_(50))_(100-x)Si_x(x=0,0.5,1.0,1.5,2.0 at.%)铸态合金。选用光学显微(OM),X射线衍射仪(XRD),扫描电镜(SEM)对铸态合金的显微结构进行表征。结果表明:Si元素的加入,合金的晶粒尺寸减小,当Si含量为1.5%和2.0%时,合金晶粒明显细化,且均匀;当Si含量大于1.0%时,合金中出现Zr2Si相衍射峰,随着Si量增多,Zr2Si峰强度明显增加。对合金进行压缩性能检测表明:(Zr_(5)0Ti_(50))_(98.5)Si_(1.5)与(Zr_(50)Ti_(50))_(98)Si_2合金抗压强度均大于1400 MPa,且具有较高的塑性,展示了良好的综合力学性能,而(Zr_(50)Ti_(50))_(99)Si_1合金的强度与塑性最差,这是由于Si含量为1.0%时,合金的晶粒较大、且形状不规则所致。此外,合金的硬度与屈服强度的变化是相一致的,Si含量为1.5%时,虽其硬度值略低于未加Si的合金,但也达到较高的值,约400 HV0.2。
(Zr_ (50) Ti_ (50)) _ (100-x) Si_x (x = 0,0.5,1.0,1.5,2.0 at.%) As-cast alloys were prepared by vacuum melting. The microstructure of as-cast alloy was characterized by OM, XRD and SEM. The results show that the grain size of the alloy decreases with the addition of Si, and the grain size of the alloy is obviously refined and uniform when the Si content is 1.5% and 2.0%. When the content of Si is more than 1.0%, the Zr2Si phase Diffraction peak, with the increase of Si content, Zr2Si peak intensity increased significantly. The compressive properties of the alloy show that the compressive strength of (Zr_ (5) 0Ti_ (50)) _ (98.5) Si_ (1.5) and (Zr_ (50) Ti_ (50)) _ (50) Ti_ (50)) _ (99) Si_1 alloy has the poorest strength and ductility. This is because when the content of Si is 1.0% Alloy grains larger, and irregular shape. In addition, the hardness of the alloy is consistent with the change of the yield strength. When the Si content is 1.5%, the hardness value is slightly lower than that of the alloy without Si, but reaches a higher value of about 400 HV0.2.