1. Microstructure & Performance of Joints in High Temperature Alloys

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

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

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

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

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

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

9. Bonding completed in 1 hour

10. Kurz Single-Crystal Repair Melt shallow layer of SX substrate using laser. Feed melt pool with alloy powder. Epitaxial columnar growth. Repeat to build thicker layers.

12. Kurz Single-Crystal Repair

13. Kurz

14. Lowering Cr improves properties. Polycrystalline coatings such as NiCrAlY. Ni is anisotropic. Single-Crystal Surface Engineering

15. E 100 = 125 GPa E 111 = 310 GPa Sieborger et al.

16. Kurz Dendrites grow along. Variant selected is closest to heat flux.

17. high aluminium MCrAlY primary  low aluminium MCrAlY primary 

18. MCrAlY CMSX-4

19. Transient liquid-phase bonding

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

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

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

25. Rolls-Royce Nottingham

26. Mechanically Alloyed Oxide Dispersion Strengthened Metals

27. Fine dispersion of yttria particles

29. screw shoulder termination

30. 2D Mixing Animation Colegrove & Shercliff, 2002

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