钎焊
微观结构
材料科学
复合材料
冶金
抗剪强度(土壤)
直剪试验
接头(建筑物)
极限抗拉强度
剪切(地质)
填充金属
合金
地质学
土壤科学
土壤水分
作者
Li Li,Xiaoqiang Li,Ke Hu,Shengguan Qu,Chao Yang,Zhifeng Li
标识
DOI:10.1016/j.msea.2015.03.039
摘要
Abstract Ti–47Al–2Nb–2Cr–0.15B (at%) alloy was brazed with an amorphous Ti–25.65Zr–13.3Cu–12.35Ni–3Co–2Mo (wt%) alloy foil in vacuum furnace. The effects of brazing temperature and testing temperature on the interfacial microstructure and mechanical property of the TiAl joints were investigated in detail. Sound TiAl brazed joints are obtained at brazing temperature of 925–1050 °C for 5 min. The joint is mainly composed of two zones, and the intermetallic phases in the joint are (Ti, Zr) 2 , (Cu, Ni) and Ti 3 Al. The brazing temperature has a significant effect on the interfacial microstructure of the TiAl joint. The room temperature shear strength of the joint first increases and then decreases with the brazing temperature. The highest room temperature shear strength of the joint is 211 MPa when the TiAl alloys were brazed at 1000 °C for 5 min. The shear strength decreases with the testing temperature and maintains above 155 MPa at a temperature below 700 °C. However, solid-state diffusion and serious oxidation in the central brazed layer II lead to the sharp reduction of the joint shear strength when the testing temperature exceeds 700 °C. All the failures of the joints occur in the central brazed layer II and the (Ti, Zr) 2 (Cu, Ni) intermetallic compounds occupy most of the fracture surfaces.
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