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MADDALENA MANTOVANI UNDERGRADUATE STUDENT UNIVERSITY OF PISA ITALY LIGO-G020440-00-R

Hardness and Elasticity Measurements. MADDALENA MANTOVANI UNDERGRADUATE STUDENT UNIVERSITY OF PISA ITALY LIGO-G020440-00-R. Introduction. Production of glassy metal Fusion of alloy Rapid quenching Vicker Hardness Test Tensile strength Critical crack length. PRODUCTION.

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MADDALENA MANTOVANI UNDERGRADUATE STUDENT UNIVERSITY OF PISA ITALY LIGO-G020440-00-R

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

  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 • (Mo0.6 Ru0.4)1-x Bx • Glassicity range from x=14 to x=24 ΔT Exothermic Amorphous Crystalline Temperature LIGO Laboratory at Caltech

  4. FUSING THE ALLOY Mini-Arc Melter Copper mould 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 Laser beam pistons LIGO Laboratory at Caltech

  7. sample coil LIGO Laboratory at Caltech

  8. LIGO Laboratory at Caltech

  9. pistons LIGO Laboratory at Caltech

  10. LIGO Laboratory at Caltech

  11. Apparatus For Hardness Test • Example values MoRuB17 • d=24.5 μm Diamond tip sample Mass over the diamond d microscope diamond VERNIER SCALE CROSSHAIR LIGO Laboratory at Caltech

  12. VICKER HARDNESS TEST • V.H = (1854)(m) / d2 = [Gpa] • V.H.=1556.4 G Pa • Tensile Yield strength: σY= V.H / 300 • σY=5.2 G Pa • 5.2 Gpa is in agreement with literature LIGO Laboratory at Caltech

  13. ΔL Lc Calculations • Stress Intensity Factor/ Fracture toughness: KIC=45 M Pa /m1/2 • Critical Crack Length: Lc= (KIC/σY)2 • Lc=75 μm 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 LIGO Laboratory at Caltech

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