LIGO- G020000-00-P BARBARA SIMONI UNDERGRADUATE STUDENT UNIVERSITY OF PISA ITALY LIGO-G020439-00-R Phase transition heat in MoRuB.

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Presentation transcript:

LIGO- G P BARBARA SIMONI UNDERGRADUATE STUDENT UNIVERSITY OF PISA ITALY LIGO-G R Phase transition heat in MoRuB

LIGO- G P Introduction Production of glassy metal »Fusion of alloy »Rapid quenching Phase transition heat as a function of percentage of Boron in MoRuB »Transition Temperature »Differential Thermal Analyzer (DTA)

LIGO- G P PRODUCTION (Mo 0.6 Ru 0.4 ) 1-x B x Glassicity range from x=14 to x=24 AmorphousCrystalline Temperature ΔT Exothermic

LIGO- G P FUSING THE ALLOY Copper mould Mini-Arc Melter

LIGO- G P 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- G P Ultra- rapid Quenching coil pistons Laser beam

LIGO- G P sample coil

LIGO- G P

pistons

LIGO- G P

When a liquid is cooled one of two events may occur: a. Crystallization at the melting point (Tm) OR b. Increasingly viscous ‘Supercooled’ liquid at temperature below Tm turns to glass The Glass Transition Temperature

LIGO- G P Volume Temperature

LIGO- G P Differential Thermal Analyzer (DTA)

LIGO- G P DTA SAMPLE AREA

LIGO- G P Differential Thermal Analyzer

LIGO- G P CALIBRATION Three types of calibration:. Temperature. Heat Flow. Furnace

LIGO- G P ALLUMINUM CALIBRATION Standard: Tm = CHeat of fusion = J/g

LIGO- G P GOLD CALIBRATION Standard: Tm = 1063 CHeat of fusion = 63.7 J/g

LIGO- G P BASELINE Furnace temperature Sample temperature Program temperature

LIGO- G P MEASUREMENT

LIGO- G P Conclusions Confirmed the amorphous state »By X-ray Diffraction (Brian) Confirmed composition »Through thermal analysis on DTA Measured strength values (within 10%) »Vicker Hardness test (Maddalena) Continuation of Work »Will characterize full amorphous range for MoRuB »Will study the changing trends of phase transitions with changing Boron percentage

LIGO- G P 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 Student: Maddalena Mantovani,mike Hall Brian Emmerson,Stefano Tirelli