Interface Bonding Performance of Ti/Al/Ti Composite Plate by Powder-in-tube Method
Ti/Al/Ti composite plate was prepared by powder-in-tube method through"hot rolling+intermediate annealing+further cold rolling"process.SEM,EPMA,EDS,XRD and universal testing machine were used to study the interface morphology,element distribution,phase type and interface bonding strength of Ti/Al/Ti composite strip under different preparation parameters.The results show that the formation of a single brittle intermetallic compound TiAl3 hinders the diffusion of Ti/Al elements and the thickness of the diffusion layer decreases.After annealing at 500℃,the diffusion layer is mainly a metallurgical bonding layer formed by diffusion,and a small amount of intermetallic compound TiAl3 is generated in the local area.The interfacial bonding strength is affected by the dynamic changes of metallurgical bonding strength and mechanical bonding strength.With the increase of reduction rate,the bonding strength first decreases,then increases and then decreases.After annealing at 550℃,the interfacial reaction is enhanced,TiAl3 phase gradually increases,the strength of diffusion layer increases,and the metallurgical bonding strength increases from 14.3 N/mm(500℃)to 35.1 N/mm(550℃).With the increase of reduction rate,the fragmentation degree of the compound layer increases,and the interfacial bonding strength gradually decreases.
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