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 Materials Analyses for CRAB Cavities Pilar Fernandez Pison (EN/MME/MM) 1 February 2016

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

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.

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

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

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.

Specimen extraction 7 Pilar Fernandez Pison - 1 February 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).

Specimen extraction 8 Pilar Fernandez Pison - 1 February 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).

Specimen extraction 9 Pilar Fernandez Pison - 1 February 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).

Specimen extraction 10 Pilar Fernandez Pison - 1 February 2016

Specimen extraction 11 Pilar Fernandez Pison - 1 February 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).

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

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

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

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

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

Specimen extraction 17 Pilar Fernandez Pison - 1 February 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).

Specimen extraction 18 Pilar Fernandez Pison - 1 February 2016

Specimen extraction 19 Pilar Fernandez Pison - 1 February 2016

Specimen extraction 20 Pilar Fernandez Pison - 1 February 2016

Specimen extraction 21 Pilar Fernandez Pison - 1 February 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).

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

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

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

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

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

Metallurgy: Ti – Ni interface 27 Pilar Fernandez Pison - 1 February 2016 SEM observation + EDX analysis Spectrumat % Tiat % Ni 1100-Ti TiNi TiNi Ni 5-100Ni TiNi Ti2Ni

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

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

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

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