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C17110 and C17410 coppers

C17110 and C17410 coppers.  Chemical composition (wt%) : copper = alloy balance Be Ni Co Fe Zr Sn Al Si Zn Cr Pb

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C17110 and C17410 coppers

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  1. C17110 and C17410 coppers  Chemical composition (wt%) : copper = alloy balance Be Ni Co Fe Zr Sn Al Si Zn Cr Pb C171100.34 1.3 - - 0.1 0.03 - - - - - C174100.31 0.02 0.5 0.03 - 0.005 0.04 0.02 < 0.01 < 0.005 0.003  Thermo-mechanical treatment : C17110 TH01 = solution annealed + cold worked to 1/4 hard + precipitation hardened C17410 TH02 = solution annealed + cold worked to 1/2 hard + precipitation hardened 300 - 400oC Be-enriched g phase 750 - 800oC LHC Vacuum Design Meeting Karine COUTURIER/EST-SM

  2. Tensile properties at RT L = longitudinal direction - T = transversal direction Rp 0.2 / MPa Rm / MPa A / % C17110 / TH01 506 628 24.1 C17410 / TH02 626 736 18.7 LHC Vacuum Design Meeting Karine COUTURIER/EST-SM

  3. Tensile properties at 4.2 K L = longitudinal direction - T = transversal direction Rp 0.2 / MPa Rm / MPa A / % C17110 / TH01 580 850 40.6 C17410 / TH02 740 937 37.5 LHC Vacuum Design Meeting Karine COUTURIER/EST-SM

  4. Comparison : Tensile properties  lower yield and tensile strengths  higher elongation at breakdown LHC Vacuum Design Meeting Karine COUTURIER/EST-SM

  5. Comparison with C17200 copper More traditional grade with higher Be content (2 wt%) Used in LEP ring at present TH02 thermo-mechanical treatment  Tensile properties at room and low temperatures :  improved formability  Improved electrical conductivity : C17200/TH02C17110/TH01 C17410/TH02 Total alloying (wt%) 3.2 1.77  0.943 % IACS 22-25 49.3 53.3 LHC Vacuum Design Meeting Karine COUTURIER/EST-SM

  6. Conclusion  Advantages of C17110 and C17410 coppers in TH02 state : - higher ductility, improved formability  easier product forming  simple manufacturing process - higher electrical conductivity  improved electrical output compared to more traditional C17200 beryllium copper  Are those new coppers interesting for LHC applications ? Is Rp 0.2 value sufficient ? Is material choice still open ?  STAINLESS firm propose to visit CERN during the first week of May. LHC Vacuum Design Meeting Karine COUTURIER/EST-SM

  7. Two new low beryllium coppers Description of C17110 and C17410 coppers : alloying, thermo-mechanical state.  Tensile properties at room temperature and 4.2 K.  Comparison with more traditional C17200 copper : tensile properties, electrical conductivity.  Conclusion : formability, electrical output. possible applications at CERN. LHC Vacuum Design Meeting Karine COUTURIER/EST-SM

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