Microstructure & Performance of Joints in High Temperature Alloys

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Microstructure & Performance of Joints in High Temperature Alloys

Microstructure & Performance of Joints in Superalloys www.msm.cam.ac.uk/phase-trans

Shirzadi, Saindrenan & Wallach, 2003 Diffusion Bonding Pure aluminium Minimal gallium Shirzadi, Saindrenan & Wallach, 2003

Diffusion Bonding of Gallium -Treated Superalloy Surfaces 3-10 MPa pressure 900-1250 oC 1 h 10-7 bar 1 mg cm-2 gallium

100 µm Co-23Cr-10 Ni-7W 0.2Ti-0.6C-0.5Zr wt% Shirzadi & Wallach

50 µm Ni-15Cr-10Co-9.5Mo 4.2Al-3.6Ti-0.006B wt% Shirzadi & Wallach

Directionally solidified nickel superalloy Single-crystal nickel superalloy Shirzadi & Wallach

Bonding completed in 1 hour Shirzadi & Wallach

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high aluminium MCrAlY primary b low aluminium MCrAlY primary g

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Transient liquid-phase bonding

Al-Li TLP TG-TLP Shirzadi & Wallach, 1999

TG-TLP Alloy 6082 Large gradient Small gradient Shirzadi & Wallach, 1999

Inertia Welding Process No liquid phase Can join dissimilar metals Powder metallurgical alloy RR1000 Residual stress Baxter, Preuss, Withers

Rolls-Royce Nottingham

Oxide Dispersion Strengthened Metals Mechanically Alloyed Oxide Dispersion Strengthened Metals

Fine dispersion of yttria particles

screw shoulder termination

2D Mixing Animation Colegrove & Shercliff, 2002

Microstructure & Performance of Joints in Superalloys www.msm.cam.ac.uk/phase-trans