简介:ThecorrosionbehaviorofZL104alloyatdifferentstates(as-castandheattreatment)insaltspraycorrosion(SSC)wasstudied.Theresultsshowthatthesampletreatedafterrefinementandmodifciationhastheleastcorrosiveresistancecomparedwiththesamplebearingas-caststucureatthebeginningofthecorrosion.Asthecorrosionprocesscontinued.however,thetrendreverseditself.After44hcontinuouscorrosion,thecorrosiveratesofallsamplestendtobestable.Afterexperiments,thesamplebearingas-caststructurehadthemostcorrosiveproductsonthesurfacewhereasthesamplebeingrefinedandmodifiedhadtheleastproducts.TheFouriertransformationinfraredspectroscopy(FTIR)analysesofthecorrosionproductsshowthattheseproductsarecomposedofhydroxyl-containingsubstances.
简介:摘要:使用碱溶法溶解铸造铝合金ZL101A并采用电感耦合等离子体发射光谱法对其中的硅含量进行测定。通过选择元素的分析线来优化测试条件,利用基体匹配法消除基体干扰,对检测结果进行了相对标准偏差和回收率的计算。
简介:ThecreepbehaviorofAI2O3.SiO2fiberreinforcedZL109compositeshasbeeninvestigatedatfourtemperaturesrangingfrom553to623K.Theresultsshowhighstressexponentandhighapparentcreepactivationenergy.Agoodcorrelationbetweenthenormalizedcreeprateandnormalizedeffectivestressmeansthatthetruestressexponentofminimumcreepstrainrateofthecompositeisverycloseto5,andtheminimumcreepstrainrateismatrixlatticediffusioncontrolled.Thethresholdstressdecreaseswithincreasingtemperaturelinearlyanddisappearsatatemperaturecloseto623K.Itisassumedthatthelongrangeinternalbackstressesgeneratedincreepreducetheloadtransfertofibersandtheinteractionbetweendislocationsandstrengtheningprecipitatesdecreasesathightemperature.Atahightemperaturewherethelongrangeinternalbackstressesisveryclosetotheappliedstress,thethresholdstressdisappears.