Bi熔体粘滞性的非连续变化现象

Bi熔体粘滞性的非连续变化现象 熔粘性的非连连连化连象体滞Bi 第卷第期l91 年月2OO53 连南大学自然科学(版)JOURNALOFJ1NANUNIVERSITY(sci.&Teeh.)VD1.19No.1 Mar.2005 文章连号:1671—3559(2005)01—0092—01 研究连连 熔粘性的非连连连化连象体滞Bi 耿浩然郭忠全连利广连春静耿连霞,,,, 连南大材料科院学学与学山连连南山连大材料科工程院学学与学(1,,250022;2., 山连连南250061) 摘要金熔的粘性是液连金原子移能力的一连属体滞属迁: 表连反映了原子连连合力的大小是重要的熔敏感物理体,, 性连之一从构中能得到连多连于液连连的信息同连也是,,重要的连造工连参数熔的粘度一度曲连连系表明体温.Bi,粘度着度的降低而增加随温但不连连并连算可知高温区,,,域的粘流活化能连最小低域的最大温区中域的连温区E,,于者之连两随温度升高流连尺寸在小减连合.,u.DSC曲连分析连连粘度常连化域是异区熔由不均向均体匀,Bi 匀构原子连非连连连化所引起的与体熔中原子健的连连密, 切相连. 连连连熔体粘度连分析活化能:Bi;;DSC; 中连分连号文连连连献:TG146.2:A , 乏 # 温度/? 连熔体的粘度度的连系曲连与温1Bi 连连的连点连连金熔的粘度度连系属体温, 曲连连呈连连的指连系数但熔的粘度一体温.Bi 度连系曲连表明粘度着度的降低而增加随温但并,, 不连连存在着段不同的连化连连分连连高称温,3, 区中和低温区温区其常连化的度连大连异温区,. 分连连,和,400oC430?610oC640oC. 收稿日期:2O04—10—19 基金连目国学家自然科基金连助连目:(50371047) 作者连介耿浩然一男山连平原人连南大材料科学:(1954),,, 学与学教工程院授博士... DiscontinousViscosity Variation0fBiMdt 连GJGHao-ran',GI302~ng-qaan'. 目连CHENGlnSONc|n,GJG14v~xia2 (1,School0fMaterialScienceandEngineering- JinanUniversity.Jinan25OO22.China;2.School0fMaterialandScien~0fShandongUmversi~,Jinan250061,China) Ab:Theviscosityofmetalmeltisoneofthemostimpor-rantsensitivephysicalfeaturewhichrepresentstheabilityoftheatommovingofmetalnzlt.andreflectsthebiIldiIlgenergyl~'woPal 】atoms.Fromit,wecangetlotsofmessagesofnzltnlia?stncte,? atthes[netime.itisalsoaimportantparameteroffoundry-hies.nvisc~ty—temperaturecurveofBinzltshowedthatthevisex~ityvaluesdroppedwitlltheincreaseoftemperature.however,thediscontinuousc}lal[1girlgtookplaceintheviscosityCUI~C,Viscos-ity0fBimeltcarIbedividedintothreepartsacil1gtoitscIlaIlgeratewitlltemperature,Ahi#temperaturezone.moderatetempera-tureZOII~andlowtemperaturezonecanbeusedtodescribethevis- 叩cositybehavior,ClbiIltheDSCanalysis,theabnormalphe- 【nomenonwas.ploIfixanthemicm6copicstructureviewpoint,It 面佩wasassumedthatthec}Iarlgefromahomogeneousatomcogu toaninhomogen~moneledtothetemperature-dependentdiscon-tinuousvailation.innontothebondtransformationwiththein-creaseoftemperatureintheBimelt. Keywords:meltBi;viscosity;DSCanalysis;activationenergy