Ti-Cu-Ni-Zr大块非晶合金玻璃形成能力与力学性能

发布时间：2019-04-10 06:31

【摘要】：采用"二元共晶混合"法设计富Ti基Ti-Cu-Ni-Zr合金成分,通过水冷铜模铸造法制备出不同直径Ti-Cu-Ni-Zr合金棒材。利用X射线衍射仪(XRD)、差示扫描量热仪(DSC)、万能试验机和扫描电镜(SEM)研究合金的玻璃形成能力和力学性能。结果表明,Ti-Cu-Ni-Zr合金具有较高玻璃形成能力,其中Ti_(38)Cu_(45.26)Ni_(9.14)Zr_(7.6)合金最大临界直径为3 mm;Ti-Cu-Ni-Zr合金玻璃形成能力与Trg值关系较大,而与ΔTx、γ值关系较小。通过对合金力学性能进行研究,结果表明,Ti_(38)Cu_(45.26)Ni_(9.14)Zr_(7.6)非晶合金具有屈服强度1 937 MPa,断裂强度2 071 MPa,且具有0.6%的塑性,而Ti_(39)Cu_(43.8)Ni_(9.6)Zr_(7.6)非晶合金断裂机制为完全脆性断裂;对于完全脆性断裂的Ti_(39)Cu_(43.8)Ni_(9.6)Zr_(7.6)非晶合金,主剪切面和次剪切带可能同时发生。
[Abstract]:The composition of Ti-rich Ti-Cu-Ni-Zr alloy was designed by binary eutectic mixing method. Ti-Cu-Ni-Zr alloy bars with different diameters were prepared by water-cooled copper mold casting. X-ray diffractometer (XRD), differential scanning calorimeter (DSC), universal testing machine and scanning electron microscope (SEM) were used to study the glass forming ability and mechanical properties of the alloy. The results show that Ti-Cu-Ni-Zr alloy has high glass forming ability, and the maximum critical diameter of Ti_ (38) Cu_ (45.26) Ni_ (9.14) Zr_ (7.6) alloy is 3 mm;. The glass forming ability of Ti-Cu-Ni-Zr alloy has great relation with Trg value, but has little relation with 螖 Tx, 纬 value. The results show that Ti_ (38) Cu_ (45.26) Ni_ (9.14) Zr_ (7.6) amorphous alloy has yield strength of 1 937 MPa, fracture strength of 2071 MPa,. The fracture mechanism of Ti_ (39) Cu_ (43.8) Ni_ (9.6) Zr_ (7.6) amorphous alloy is full brittle fracture. For Ti_ (39) Cu_ (43.8) Ni_ (43.8) Zr_ (7.6) amorphous alloy with complete brittle fracture, both the principal shear plane and the secondary shear band may occur at the same time.
【作者单位】：陕西理工大学材料科学与工程学院;
【基金】：陕西省教育厅专项基金资助项目(16JK1152) 陕西理工大学博士启动基金资助项目(SLGKYQD2-22)
【分类号】：TG139.8

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