B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
13/22
B32B 7/04 (2006.01) B23K 20/22 (2006.01) B23K 20/233 (2006.01)
Patent
CA 2015014
DIFFUSION BONDING OF TITANIUM ALLOYS WITH HYDROGEN-ASSISTED PHASE TRANSFORMATION ABSTRACT OF THE DISCLOSURE A piece of a titanium-based alloy having an elevated temperature phase transformation is diffusion bonded to a second piece at an accelerated rate or reduced temperature, as compared with conventional diffusion bonding, by manipulating the phase transformation with an alloying element that can be readily introduced into, and removed from, the titanium piece. The introduction of hydrogen into the titanium alloy reduces the temperature of the phase transformation. The titanium alloy can be repeat- edly cycled through the phase transformation before or during bonding, by the introduction and removal of hydrogen, to reduce the flow stress through transformation plasticity. Alternatively, the titanium alloy may be loaded with hydro- gen to reduce the phase transformation temperature, increas- ing the fraction of the more deformable phase and thence reducing the flow stress of the alloy at the diffusion bonding temperature.
Keiser Robert J.
Ruckle Duane L.
Strangman Thomas E.
Alliedsignal Inc.
Gowling Lafleur Henderson Llp
Keiser Robert J.
Ruckle Duane L.
Strangman Thomas E.
LandOfFree
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