以Ti/V/Cu、V/Cu为中间层的TiAl合金与40Cr钢的扩散连接

Diffusion Bonding of TiAl to 40Cr Steel with Interlayers Ti/V/Cu and V/Cu

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。

Diffusion bonding processes and its joint properties of TiAl to 40Cr are studied in this paper.Experiments indicate that tensile strength of the TiAl/Ti/V/Cu/40Cr joint is higher than that of TiAl/V/Cu/40Cr joint.Intermetallic compounds and other brittle phases are not found in the joint region of Ti/V, V/Cu,Cu/40Cr,while Ti 3Al is formed at interface of the TiAl/Ti,and Ti 3Al and Al 3V are formed at intrface of the TiAl/V.It is considered that fracture of the joints is caused by these brittle intermetallics at interface.