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Interface characteristic and mechanical performance of TiAl/Ti2AlNb diffusion bonding joint with pure Ti interlayer.
- Source :
- Rare Metals; Dec2020, Vol. 39 Issue 12, p1402-1412, 11p
- Publication Year :
- 2020
-
Abstract
- Solid-state diffusion bonding (DB) of TiAl alloy and Ti<subscript>2</subscript>AlNb alloy was carried out using pure Ti as an interlayer at 1000 °C under 20 MPa for 60–120 min. The effects of bonding times on the interfacial microstructure and mechanical performance of the TiAl/Ti/Ti<subscript>2</subscript>AlNb bonded joints at room temperature (RT) were investigated detailly. The results demonstrated that the diffusion layers (DLs) mainly consisted of four characteristic layers, (I) single coarse α<subscript>2</subscript> phase adjacent TiAl alloy, (II) single refined α<subscript>2</subscript> phase at the bonding interface, (III) equiaxed/acicular α<subscript>2</subscript> phase embedded in β phase adjacent Ti<subscript>2</subscript>AlNb alloy and (IV) both equiaxed α<subscript>2</subscript> phase and acicular O phase embedded in β phase adjacent Ti<subscript>2</subscript>AlNb alloy, respectively. The thickness of the four layers increased with the increasing of the bonding time. The growth of DLs is controlled by diffusion and the reaction rate constant k for region I, II, III and IV are 1.22 × 10<superscript>−6</superscript>, 1.27 × 10<superscript>−6</superscript>, 2.6 × 10<superscript>−7</superscript> and 7.7 × 10<superscript>−7</superscript> m·s<superscript>−1/2</superscript>, respectively. Meanwhile, the interface α<subscript>2</subscript> grain grows up without texture. The maximum tensile strength of 281 MPa was maintained at 1000 °C for 90 min under the pressure of 20 MPa. Consequently, the phase transformation and dynamic recrystallization behavior of the DLs were discussed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10010521
- Volume :
- 39
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- Rare Metals
- Publication Type :
- Academic Journal
- Accession number :
- 145997394
- Full Text :
- https://doi.org/10.1007/s12598-020-01548-5