激光熔覆非晶復合涂層及非晶晶化研究.pdf

1、遼寧工程技術(shù)大學碩士學位論文激光熔覆非晶復合涂層及非晶晶化研究姓名：王彥芳申請學位級別：碩士專業(yè)：材料加工工程指導教師：劉憶2002.3.1LaserCladdingofZrbasedAmorphousCompositeCoatingsandLaserinducedcrystallizationofZrbasedbulkmetallicglassesAbstractInthispaperZrBasedamorphouscomposite

2、coa6ngswereproducedbylasercladdingonTisubstrateMicrostructure，hardnessandtribologycharacteristicsofZrbasedamorphouscompositecoatingsweresystematicallystudiedbyusingOM，SEM，TEM，EDX，XRD，MicrohardnessandDFPM—typeWearTestingM

3、achinesThecompositecoatingsconstituteofamorphous，interrnetallicphasesandnanocrystallineThebondingzonebetweensubstrateandcoatingiscomposedofcolumnarcrystallineofTiandⅡ一typesolidsolution(Ti／Zr)，whichguaranteesgoodmetallurg

4、ybindingDuetothepresenceofhardintermetallicphases，thecoatingslayerhashi曲microhardnessandlowfrictioncoefficientThepredominationwearmechanismswereabrasive，adhesionanddesquamateUnclergivenassumptions，amathematicalmodelofthe

5、transienttemperaturefieldduringlasercrystallizationissetupandisanalyzedusingthefinitedifferencemethodMicrostructureaftercrystallizationisalsostudi酣SandwichlikemacrostructureWasfoundafterlasercrystallizationprocessing，nam

6、ely，amorphouslayerslieattwosidesofthesample，respectively，howeverthecrystallinelayersinthemiddleThetypicalmorphologyofthelatterisdendritescrystallineKeywords：LaserCladding，Zr—BasedAmorphousAlloy，Laserinducedcrystallizatio