简介：本文采用真空钎焊工艺对1Cr18Ni9Ti不锈钢进行了焊接,焊后通过扫描电镜、电子探针扫描、XRD等分析测试手段对试样进行分析研究。研究结果表明:试样表面生成了碳化物,为TiC和Ti8C5;表面碳化物的生成过程是在真空高温环境下,Ti元素与环管中向外扩散的C发生固相扩散反应生成TiC,过量的Ti再与TiC反应生成Ti8C5。

简介：TheeffectsoftheintroductionofCetoLa_(1-x)Ce_xFe_(11.5)Si_(1.5)alloyson1:13phaseformationmechanism,thefirst-ordermagneticphasetransitionstrengtheningcharacteristics,andmagnetocaloricpropertywerestudied,respectively.Theresultsshowthattheformationmechanismsof1:13andLaFeSiphasesinLa_(1-x)Ce_xFe_(11.5)Si_(1.5)alloysarethesameasthoseofCe_2Fe_(17)andCeFe_2phasesinCe–Febinarysystem,respectively.ThesubstitutionofCein1:13phasewhichislimitedcanmakethefirst-ordermagneticphasetransitioncharacteristicsstrengthen,whichcanmakethermalandmagnetichysteresisincrease,thetemperatureintervaloftemperatureinducedphasetransitiondecrease,andthecriticalmagneticfieldoffield-inducedmagneticphasetransition(HC)increase,respectively.Owingtothelatticeshrinkof1:13phasewiththeincreaseinCecontent,theCurietemperatures(TC)showalineardecrease.Themaximumchangeinmagneticentropygraduallyincreasesduetothedecreaseintemperatureintervaloftemperature-inducedphasetransition,buttherelativecoolingcapacitiesareallabout80Jákg-1atmagneticfieldof2T.

简介：Themicrostructuresofas-castandas-solutionMg–12Gd–2Er–1Zn–0.6Zralloyswereinvestigatedbyopticalmicroscopy（OM）,scanningelectronmicroscopy（SEM）,transmissionelectronmicroscopy（TEM）,highresolutiontransmissionelectronmicroscopy（HRTEM）X-raydiffraction（XRD）andselected-areaelectrondiffraction（SAED）inthepresentinvestigation.TheresultsshowthattheprimaryeutecticphaseMg5（Gd,Er,Zn）andsomeflocculentfeaturesarefoundintheas-castalloy;theSAEDpatternindicatesthattheseflocculentfeaturesarethedenseareasofstackingfaults.The14H-LPSOstructureprecipitatesinthetemperaturerangeof673–793K,andthevolumefractionof14H-LPSOstructureincreaseswiththeextensionofheatingtime;however,thereisnoprecipitationof14H-LPSOstructurewhenthetemperaturereachesupto803K.Inaddition,theMg5（Gd,Er,Zn）phasedissolvesgraduallyalongwiththeprecipitationof14H-LPSOstructure.