连续ecae动态时效成形al-zr-b-y耐热铝合金导体的组织与性能

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1、沈阳大学硕士学位论文过程中，只有少量Y元素过饱和固溶在Al-0.3Zr-0.06B合金中，大部分Y偏聚在Al-0.3Zr-0.06B合金的晶界处。对Al-0.3Zr-0.06B合金进行Y元素合金化后，提高了导体的导电率、抗拉强度和耐热性。并且Al-0.3Zr-0.06B合金的导电率在Y含量为0.2%时达到最高，为59.5%IACS。(4)采用过时效工艺，可制备高性能的Al-Zr-B-Y合金的导体。Al-0.3Zr-0.06B-0.2Y合金在过失效处理时的时效温度、时效时间、抗拉强度、伸长率、等效导电率为：①160℃、12h、267.76MPa、7.0%、59.32%IACS，

2、②180℃、12h、265.32MPa、6.7%、59.54%IACS，③200℃、12h、263.21MPa、6.4%、59.73%IACS，④220℃、12h、261.87MPa、6.2%、59.94%IACS。(5)添加适量的稀土Y元素的可有效提高Al-0.3Zr-0.06B合金导体的导电性能，在时效温度和时间分别为220℃和16h时导线的导电性达到最高值，Al-0.3Zr-0.06B-0.2Y为59.4%IACS。关键词：Al-Zr-B-Y合金，连续ECAE，拉伸强度，导电率，时效处理II万方数据TheMicrostructuresandPropertiesofAl-

3、Zr-B-YHeat-resistantAluminumAlloyWiresPreparedbyContinuousECAEAgingFormingAbstractAluminumhassmalldensity,highspecificstrength,betterelectricalconductivityandheat-conductingproperty.Hightemperatureheatresistantaluminumalloywireisanewkindofspecialwires.Comparedwithtraditionalwire,ithashighte

4、mperaturestrength,hasagoodabilitytoresistfreezedisaster.Accordingtotheproduction–researchstatusofAl-Zr-B-Yresistantheatelectricconductors,Al-Zr-B-Yalloyelectricconductivewirewasstudiedobjectinthispaper,throughtheDEFORM-3Dsimulation,optimizationtoimprovemoldstructure,makeitmorereasonable;usi

5、ngcontinuousECAEdynamicagingmoldingprocesstoimprovethecomprehensivemechanicalpropertiesandelectricalconductivityofaluminumalloyconductor.ThroughdynamiccontinuousextrusionECAEprocess,todeterminetheoptimumextrusiontimes;throughtheagingtreatment,furtherimprovethecomprehensiveperformanceofcondu

6、ctor.Bymeansofmetallographicmicroscope,agingtreatmentfurnace,scanningelectronmicroscope(SEM),thetensiletestingmachineandequipment,includingarmsdcbridgeinstrumentstudycontinuousdynamicagingECAEprocessingofAl-0.3Zr-0.06B-0.2Yalloymicrostructure,mechanicalpropertiesandelectricconductivity.Them

7、ainresultsareasfollows:(1)ByusingDeform-3Dsoftwaresimulation，OptimizationofECAEmouldandsimulationofdrawingprocess.thetemperatureofaluminumwiresincreaseswiththeincreaseofdrawingpasses,drawingspeedandfrictioncoefficient.Thetemperatureofthefinisheddrawingwi