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1、哈尔滨理工大学工程硕士学位论文TheeffectoftheContentofCuontheSolidificationCharacteristicsofAl-CuAlloysAbstractHigh-strengthcastaluminum-copperalloy(hereinafterreferredtoasAl-Cualloy)hasgoodintegratedmechanicalproperties,suchasductility,toughness,bearingcapacity,machinabilityandplating,
2、etc.Inrecentyears,Al-Cualloysaremainlyusedinconstruction,transportation,electricity,aerospaceandotherindustries,particularlyintheaerospaceandaircraftmanufacturingfieldtoachievethe"Castinginsteadofforging".Thehigh-strengthcharacteristicsofAl-Cualloyscanbefullybroughtout.H
3、owever,Al-Cualloyhaswidecrystallinetemperaturerangeandcastingispronetoappearhotcracking,shrinkageandothercastingdefects.ThesedefectsincreasedthecastingdifficultyofAl-Cualloys.ThecoppercontentinAl-Cualloyisanimportantfactorofinfluencingthesolidificationcharacteristics.The
4、reforestudythesolidificationcharacteristicsofdifferentCucontenthasimportanttheoreticalandpracticalsignificance.Inthispaper,singlespiralsampletestmethodandcastingalloysolidificationpropertiesanalyzerareusedtomeasurealloyhotcrackingtendency,thermalstressandlinearshrinkage,
5、studytheeffectofcoppercontentonthepropertiesofaluminum-copperalloysolidification.Theresearchresultsshowthatmobilitydecreasedfirstandthenincreasedwiththecontentofcopperincreased;whenthecoppercontentis10%,thealloyispreferablyflowability.Fluidityrisesupwardtrendwiththepouri
6、ngtemperature.DegassingtreatmentcanalsosignificantlyimprovetheliquidityofAl-Cualloy.Whenthecoppercontentof5.5%andthetemperaturedroppedto550℃,hottearingtendencylargest,mostpronetohotcracking.Whenthetemperatureis300℃,thethermalstressdecreasesandthenincreaseswithcopperconte
7、nt,thecoppercontentis5.0%whentheminimumvalueofthermalstress.Whenthecontentofcopperis10%,thetotalmaximumaftersuperpositionoftensilestressandcompressivestressesis19.5MPa.ThelinearshrinkageofAl-Cualloydecreasesfirstandthenincreaseswithcoppercontent-II-哈尔滨理工大学工程硕士学位论文increas
8、ing,reachedtheminimumat5%.Byselectingtherightingredients,improvingthecastingmouldprocessandpouringcondi
