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采用“二元共晶混合”法设计出富Ti的Ti_(41.5)Cu_(40.1)Ni_(10.8)Zr_(7.6)、Ti_(40.7)Cu_(40.8)Ni_(10.5)Zr_8和Ti_(39.2)Cu_(42)Ni_(10.1)Zr_(8.7)合金成分,用水冷铜模铸造法制备出直径为2 mm合金棒。采用X射线衍射仪表征合金微结构,采用示差扫描量热仪(DSC)和差热分析仪(DTA)测试热力学数据。结果表明,富Ti的Ti_(39.2)Cu_(42)Ni_(10.1)Zr_(8.7)合金具有较高的玻璃形成能力,其临界直径可达2 mm,其过冷液态区ΔTx,参数γ值分别为39 K和0.385,高于其它两种合金;而临界尺寸小于2 mm的Ti_(40.7)Cu_(40.8)Ni_(10.5)Zr_8合金的约化玻璃转变温度Trg值却最大。通过吉布斯自由能(ΔG)计算,发现Ti_(39.2)Cu_(42)Ni_(10.1)Zr_(8.7)合金ΔG值小于其它两种合金。玻璃形成能力较好的Ti_(39.2)Cu_(42)Ni_(10.1)Zr_(8.7)合金具有0.4%塑性形变,屈服强度高达1901 MPa,抗压强度高达2025 MPa。
Ti (41.5) Cu_ (40.1) Ni_ (10.8) Zr_ (7.6), Ti_ (40.7) Cu_ (40.8) Ni_ (10.5) Zr_8 and Ti_ (39.2) were designed by the method of “binary eutectic mixing” ) Cu_ (42) Ni_ (10.1) Zr_ (8.7) alloy, a 2 mm diameter alloy rod was prepared by water-cooled copper mold casting. The microstructure of the alloy was characterized by X-ray diffractometer. The thermodynamic data were measured by differential scanning calorimeter (DSC) and differential thermal analyzer (DTA). The results show that the Ti-rich (39.2) Cu 42 Ni 10.1 Zr 8.7 alloy has higher glass forming ability and its critical diameter is up to 2 mm. The ΔTx and the parameter γ of the supercooled liquid zone are respectively 39 K and 0.385, higher than those of the other two alloys. However, the reduced glass transition temperature (Trg) of Ti 40.7 Cu 40.8 Ni 10.5 Zr 8 alloy with the critical size less than 2 mm was the highest. The Gibbs free energy (ΔG) calculation shows that ΔG of Ti_ (39.2) Cu_ (42) Ni_ (10.1) Zr_ (8.7) alloy is smaller than that of the other two alloys. Ti_ (39.2) Cu_ (42) Ni_ (10.1) Zr_ (8.7) alloys with better glass forming ability have 0.4% plastic deformation, yield strength up to 1901 MPa and compressive strength up to 2025 MPa.