1. The HiLumi LHC Design Study is included in the High Luminosity LHC project and is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404. Materials Analyses for CRAB Cavities Pilar Fernandez Pison (EN/MME/MM) 1 February 2016

2. 2 Ongoing materials analyses Examination of the tri-metal block (Ti/Ni/SS) bonded by the explosion technique: Tri-metal block Ultrasonic measurement Specimen extraction Metallurgy Pilar Fernandez Pison - 1 February 2016

3. Tri-metal block: As-received 3 Pilar Fernandez Pison - 1 February 2016 One 100 mm x 100 mm x 72 mm block of Ti/Ni/SS, bonded by explosion welding, was received for mechanical and optical qualification of the two bonded interfaces.

4. Tri-metal block: As-received 4 Pilar Fernandez Pison - 1 February 2016

5. Ultrasonic Measurement 5 Pilar Fernandez Pison - 1 February 2016 SS – Ni interface Ti – Ni interface An initial qualification of both interfaces was performed via ultrasonic testing by immersion (5MHz/minimum size detection=1mm) No indications over 1 mm found. Ti Ni SS Ni Ti

6. Ultrasonic Measurement 6 Pilar Fernandez Pison - 1 February 2016 SS – Ni interface Ti – Ni interface Ti Ni SS Ni Ti An initial qualification of both interfaces was performed via ultrasonic testing by immersion (5MHz/minimum size detection=1mm) No indications over 1 mm found.

7. Specimen extraction 7 Pilar Fernandez Pison - 1 February 2016 -2 metallographic samples, in T- and L-direction respect to explosion bonding. -9 tensile samples (RT & 4K). Extra EB welded Ti gr-2 in head section to accommodate both interfaces in gauge length. -2 shear samples each one in a different interface, in L direction. -1 leak-tightness sample (thickness = 2mm).

8. Specimen extraction 8 Pilar Fernandez Pison - 1 February 2016 -2 metallographic samples, in T- and L-direction respect to explosion bonding. -9 tensile samples (RT & 4K). Extra EB welded Ti gr-2 in head section to accommodate both interfaces in gauge length. -2 shear samples each one in a different interface, in L direction. -1 leak-tightness sample (thickness = 2mm).

9. Specimen extraction 9 Pilar Fernandez Pison - 1 February 2016 -2 metallographic samples, in T- and L-direction respect to explosion bonding. -9 tensile samples (RT & 4K). Extra EB welded Ti gr-2 in head section to accommodate both interfaces in gauge length. -2 shear samples each one in a different interface, in L direction. -1 leak-tightness sample (thickness = 2mm).

10. Specimen extraction 10 Pilar Fernandez Pison - 1 February 2016

11. Specimen extraction 11 Pilar Fernandez Pison - 1 February 2016 -2 metallographic samples, in T- and L-direction respect to explosion bonding. -9 tensile samples (RT & 4K). Extra EB welded Ti gr-2 in head section to accommodate both interfaces in gauge length. -2 shear samples each one in a different interface, in L direction. -1 leak-tightness sample (thickness = 2mm).

12. Specimen extraction 12 Pilar Fernandez Pison - 1 February 2016 According to ASTM A265

13. Specimen extraction 13 Pilar Fernandez Pison - 1 February 2016 According to ASTM A265

14. Specimen extraction 14 Pilar Fernandez Pison - 1 February 2016 According to ASTM A265

15. Specimen extraction 15 Pilar Fernandez Pison - 1 February 2016 According to ASTM A265

16. Specimen extraction 16 Pilar Fernandez Pison - 1 February 2016 Ni - SS Ti - Ni According to ASTM A265

17. Specimen extraction 17 Pilar Fernandez Pison - 1 February 2016 -2 metallographic samples, in T- and L-direction respect to explosion bonding. -9 tensile samples (RT & 4K). Extra EB welded Ti gr-2 in head section to accommodate both interfaces in gauge length. -2 shear samples each one in a different interface, in L direction. -1 leak-tightness sample (thickness = 2mm).

18. Specimen extraction 18 Pilar Fernandez Pison - 1 February 2016

19. Specimen extraction 19 Pilar Fernandez Pison - 1 February 2016

20. Specimen extraction 20 Pilar Fernandez Pison - 1 February 2016

21. Specimen extraction 21 Pilar Fernandez Pison - 1 February 2016 -2 metallographic samples, in T- and L-direction respect to explosion bonding. -9 tensile samples (RT & 4K). Extra EB welded Ti gr-2 in head section to accommodate both interfaces in gauge length. -2 shear samples each one in a different interface, in L direction. -1 leak-tightness sample (thickness = 2mm).

22. Metallurgy: Ni – SS interface 22 Pilar Fernandez Pison - 1 February 2016 Longitudinal direction Transversal direction Ni SS Ni SS

23. Metallurgy: Ti – Ni interface 23 Pilar Fernandez Pison - 1 February 2016 Longitudinal direction Transversal direction Ti Ni Ti Ni

24. Metallurgy: Ti – Ni interface 24 Pilar Fernandez Pison - 1 February 2016 Longitudinal direction Transversal direction Ti Ni Ti Ni

25. Metallurgy: Ti – Ni interface 25 Pilar Fernandez Pison - 1 February 2016 L-directionT -direction Ti Ni Ti Ni

26. Metallurgy: Ti – Ni interface 26 Pilar Fernandez Pison - 1 February 2016 SEM observation + EDX analysis

27. Metallurgy: Ti – Ni interface 27 Pilar Fernandez Pison - 1 February 2016 SEM observation + EDX analysis Spectrumat % Tiat % Ni 1100-Ti 222.977.1TiNi3 324.175.9TiNi3 4-100Ni 5-100Ni 649.550.5TiNi 771.628.4Ti2Ni

28. Metallurgy: Ti – Ni interface 28 Pilar Fernandez Pison - 1 February 2016 SZWED BARTŁOMIEJ, KONIECZNY MAREK, MOLA RENATA. “Characterization of transient liquid-phase bonding between titanium and stainless steel using nickel interlayer”. METAL 2015 (June 2015) Scanning electron microscopic images of the diffusion brazed joints at 840 and 925 °C for 60 minutes

29. Metallurgy: Ti – Ni interface 29 Pilar Fernandez Pison - 1 February 2016 Longitudinal direction Transversal direction Ti Ni Ti Ni

30. 30 Outlook Metallography analysis -> done Ni – SS interface -> good quality Ti – Ni interface -> presence of TiNi3 (brittle) Samples will be gotten by the end of February Tensile test (RT & 4K)/ Shear test/ Leak test Pilar Fernandez Pison - 1 February 2016

31. The HiLumi LHC Design Study is included in the High Luminosity LHC project and is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404.