Analysis of diffusion bond interface of TiAl base alloy with Ti, TC4 alloy and 40Cr steel

TiAl is diffusion bonded with Ti, TC4 Alloy and 40Cr Steel by heating in vacuum, and analysis of interfaces shows stratified Ti 3Al forms in TiAl/Ti interface closest to TiAl base, and the α phase and the α+β phase arise closest to Ti base at lower temperature and higher temperature respectively; Structure of TiAl/TC4 interface is TiAl/γ+α 2/Ti 3Al/α-Ti/TC4 at lower temperature and TiAl/γ+β+α 2/TC4 at high temperature; in TiAl/40Cr steel interface, obvious decarbonised layer on steel side while TiC and reaction phase with Fe Al Ti system form on TiAl side.

以Ti/V/Cu、V/Cu为中间层的TiAl合金与40Cr钢的扩散连接

用真空扩散连接方法对TiAl/Ti/V/Cu/4 0Cr钢及TiAl/V/Cu/4 0Cr钢进行了研究。结果表明 ,以Ti/V/Cu作中间层的接头拉伸强度高于以V/Cu作中间层的接头强度。界面分析显示 ,Ti/V、V/Cu、Cu/4 0Cr钢的各个结合界面处未形成金属间化合物 ,而TiAl/Ti的结合界面上有Ti3Al产生 ;在TiAl/V的界面上有Ti3Al、Al3V两种金属间化合物产生 ;界面上脆性金属间化合物的产生是接头发生断裂的原因。