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WEI Hongmei, LI Wanqing, HE Peng, GAO Lijiao, LIN Tiesong. Technology and properties of Ti3Al/Ti/Ti2AlNb diffusion welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(4): 5-8,70.
Citation: WEI Hongmei, LI Wanqing, HE Peng, GAO Lijiao, LIN Tiesong. Technology and properties of Ti3Al/Ti/Ti2AlNb diffusion welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(4): 5-8,70.

Technology and properties of Ti3Al/Ti/Ti2AlNb diffusion welding

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  • Received Date: November 04, 2013
  • Ti3Al and Ti2AlNb alloy were connected by diffusion bonding with Ti foil as interlayer. Through a number of analysis methods such as SEM, EDS and XRD, it was discovered that the typical interface structure of Ti3Al/Ti/Ti2AlNb joint was Ti3Al/α-phase +β-phase/B2-rich phase/Ti2AlNb. The effect of process parameters, including thickness of interface layer, bonding temperature and holding time, on the interface morphology and property of the joint was investigated. The results show that when the thickness of Ti foil was 10μm, bonding temperature was 900℃ and holding time was 120 min, the resultant Ti3Al/Ti/Ti2AlNb joint had the optimized microstructure and properties. Increasing the foil thickness caused uneven diffusion of Ti, Al and Nb. The direct bonding temperature of Ti3Al/Ti2AlNb was 1000℃, the addition of Ti foil interlayer could reduce the bonding temperature to 900℃. So the damage of high temperature thermal cycling to Ti3Al alloy was decreased. The tensile strength of the joint increased from 795 MPa to 906 MPa. The holding time from 90 min to 120 min could ensure sufficient diffusion and reliable connection.
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