50Al50 (at%)合金的真空釬焊連接，并研究了釬焊溫度對(duì)釬焊接頭的顯微組織、剪切強(qiáng)度的影響規(guī)律。結(jié)果表明，在任何釬焊溫度下獲得的Ti50Al50釬焊接頭均有3個(gè)界面反應(yīng)層且每個(gè)反應(yīng)層都含有α2-Ti3Al和Ti2Cu(Ni) 2個(gè)物相。隨著釬焊溫度的增加，α2-Ti3Al和Ti2Cu(Ni)在釬焊接頭中的尺寸與分布發(fā)生了明顯的變化，尤其是等溫凝固層Ⅱ中的Ti2Cu(Ni)相。1200 ℃下穩(wěn)定存在的連續(xù)α2-Ti3Al層Ⅰ對(duì)母材和釬料原子的相互擴(kuò)散具有阻隔壁壘作用，溫度一旦超過(guò)1200 ℃，α2-Ti3Al相變得不穩(wěn)定使得連續(xù)α2-Ti3Al層被打破從而失去阻隔壁壘效應(yīng)。在釬縫中析出且彌散分布的α2-Ti3Al對(duì)焊縫中物相的形成可以起到抑制形核和細(xì)化晶粒的作用。隨著釬焊溫度升高，Ti50Al50釬焊接頭平均抗剪切強(qiáng)度先增加后減小，在釬焊溫度1180 ℃、釬焊時(shí)間30 min時(shí)釬焊接頭的抗剪切強(qiáng)度最大，達(dá)184 MPa。剪切斷口表面呈典型解理斷裂特征且α2-Ti3Al占絕大多數(shù)。;Amorphous Ti-9.5Cu-8Ni-8Nb-7Al-2.5Zr-1.8Hf (wt%) filler alloy was employed to vacuum braze Ti50Al50 (at%) alloy at the brazing temperatures ranging from 1140 to 1220 °C for 30 min. The effect of brazing temperature on the microstructure and shear strength of the brazed joints was investigated. Results show that all the brazed joints are mainly divided into three reaction layers regardless of the brazing temperature, and both of α2-Ti3Al and Ti2Cu(Ni) phases exist in each reaction layer, but their size and distribution change significantly with brazing temperature, especially the Ti2Cu(Ni) phase in isothermal solidification layer Ⅱ. The continuous α2-Ti3Al layer Ⅰ is stable below 1200 °C but breaks and loses its barrier effect above 1200 °C. It is notable that the α2-Ti3Al precipitated in the brazed seam can act as a nucleation inhibitor and refine the crystal grain. Shear test results show that the average shear strength of Ti50Al50 brazed joints first increases and then decreases with brazing temperature and the maximum shear strength of 184 MPa is obtained at 1180 °C. α2-Ti3Al mainly occupies the fracture surface with cleavage characteristics."/>
50Al50 (at%)合金;Ti-Cu-Ni-Nb-Al-Zr-Hf非晶釬料;真空釬焊;顯微組織;剪切強(qiáng)度;Ti50Al50 (at%) alloy;Ti-Cu-Ni-Nb-Al-Zr-Hf amorphous filler;vacuum brazing;microstructure;shear strength"/>