MADDALENA MANTOVANI UNDERGRADUATE STUDENT UNIVERSITY OF PISA ITALY LIGO-G020440-00-R Hardness and Elasticity Measurements.

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Presentation transcript:

MADDALENA MANTOVANI UNDERGRADUATE STUDENT UNIVERSITY OF PISA ITALY LIGO-G R Hardness and Elasticity Measurements

LIGO Laboratory at Caltech 2 Introduction Production of glassy metal »Fusion of alloy »Rapid quenching Vicker Hardness Test »Tensile strength »Critical crack length

LIGO Laboratory at Caltech 3 PRODUCTION (Mo 0.6 Ru 0.4 ) 1-x B x Glassicity range from x=14 to x=24 AmorphousCrystalline Temperature ΔT Exothermic

LIGO Laboratory at Caltech 4 FUSING THE ALLOY Copper mould Mini-Arc Melter

LIGO Laboratory at Caltech 5 RAPID COOLING AMORPHOUS STAGE Rapid quenching of MoRuB »Employed cooling rates up to 10/6 K/sec Crystallization time - Hours for Fused Silica - Seconds for Glassy Metals

LIGO Laboratory at Caltech 6 Ultra- rapid Quenching coil pistons Laser beam

LIGO Laboratory at Caltech 7 sample coil

LIGO Laboratory at Caltech 8

9 pistons

LIGO Laboratory at Caltech 10

LIGO Laboratory at Caltech 11 Apparatus For Hardness Test Example values MoRuB 17 » d=24.5 μm d Mass over the diamond diamond microscope Diamond tip sample VERNIER SCALE CROSSHAIR

LIGO Laboratory at Caltech 12 VICKER HARDNESS TEST V.H = (1854)(m) / d 2 = [Gpa] »V.H.= G Pa Tensile Yield strength: σ Y = V.H / 300 » σ Y =5.2 G Pa 5.2 Gpa is in agreement with literature

LIGO Laboratory at Caltech 13 Calculations Stress Intensity Factor/ Fracture toughness: K IC =45 M Pa /m 1/2 Critical Crack Length: L c = (K IC /σ Y ) 2 »Lc=75 μm ΔL LcLc σ σ

LIGO Laboratory at Caltech 14 Conclusions Confirmed the amorphous state »X-ray Diffraction (Brian) Confirmed composition »Through thermal analysis (Barbara) Measured strength values (within 10%) »Vicker Hardness test Continuation of Work »Will characterize full amorphous range for MoRuB »Will study the changing trends of Yield strength and elasticity due to the varying Boron atomic percent in MoRuB

LIGO Laboratory at Caltech 15 THANKS TO My Mentor: Riccardo De Salvo Francesco Fidecaro Prof. W. L Johnson (Material Science) Jan Schorer (Post Doctoral Scholar) Hareem Tariq (Graduate Student) SURF students: Barbara Simoni, Mike Hall, Brian Emmerson, Stefano Tirelli