简介:MicrostructureandmechanicalpropertiesofAl-Cu-Mgalloymatrixhybridcompositesfabricatedbysqueezecasting;MicrostructureandTensilePropertiesofAIHybridCompositesReinforcedwithSiCWhiskersandSiCNanoparticles;NUMERICALMODELLINGOFSQUEEZECASTMAGNESIUMALLOYAM50WITHNATURALCONVECTIONINTHEMELT;NUMERICALSIMULATIONOFNATURALCONVECTIONINMAGNESIUMALLOYSQUEEZECASTING;Ontheimportanceofmatrixcreepinhightemperaturedeformationofshortfibrereinforcedmetalmatrixcomposites
简介:Effectsofparticle-dispersiononthestrengthofanaluminafiber-reinforcedaluminumalloymatrixcomposite;EffectsofshortmullitefibresonagingresponseofAl-4-5Cubasedmetalmatrixcomposite;Flowanalysisapplicationtorheo-casting;HighTemperatureMechanicalBehaviorandMicrostructureofα-Si{sub}3N{sub}4w/4032AlCompositeFabricatedbySqueezeCasting;HotExtrusionandItsEffectonMicrostructureandPropertiesofSqueezeCastingSiC{sub}P/AlCompositeswithLowerVolumeFractionofReinforcement。
简介:AComparativeStudyBetweenSqueezeCastingandSemi-SolidMetalCastingProcesses,Advancedsqueezecastingprocessfornear=net-shapeADIlightcomponents,AgingcharacteristicsofshortmullitefiberreinforcedA1-4.0Cu-1.85Mgmetalmatrixcomposite,ApplicationofNumericalSimulationtoOptimizeDieDesignsandProcessesinHigh-Pressure/Squeeze/Semi-SolidCasting,Conditionsforthepouringofaluminumfoamcoresintolightmetalcastings.
简介:摘要:采取XRD、金相分析、拉伸测试、SEM分析等办法检测与研究了挤压加工AZ81铸件在铸态(F)、固溶态(T4)和固溶-时效态(T6)状态下的显微结构与力学性能。结果显示:通过固溶处置后,AZ81铸件晶界与枝晶界的网型β-Mg17Al12相基本都溶进基体;铸件断口从大量深浅不同的韧窝构成,塑性开裂区明显加大,塑性大大改善;合金防拉强度与伸展率都有明显提升,分别是253.81MPa与10.24%,硬度(HRE)与屈服强度则明显降低;T6态处置后,铸件ɑ-Mg基体上产生β-Mg17Al12相弥散析出,铸件防拉强度不断提升到262.49MPa,HRE与屈服强度也有所提升,但延展率有所下降,铸件断口韧窝削减且产生大解理平面,断口外形存在脆性开裂特点。
简介:研究了K4169高温合金在各种工艺条件下及向熔体中加入复合细化剂时的晶粒组织.结果表明.降低浇注温度和加入复合细化剂可以明显细化冷凝后基体的晶粒和提高铸件断面等轴晶的比例。在通常的浇注温度1400℃下加入复合细化济.对合金熔体进行或不进行过热处理时.可使圆柱锭的品粒分别细化至ASTM11.7级和ASTM3.2级:断面等轴晶的比例分别达96%和99%以上.当浇注温度为1420℃,加入复合细化利并对合金熔体进行过热处理时,可使圆住锭晶粒细化至ASTMM10.5级,断面等轴晶的比例达90%以上,提出了晶粒细化的机理并对晶粒细化后断面等轴晶比例增大的现象进行了分析。