| Microstructures of worn surface and wear debris of as-cast Al-17Si-xLa alloys under unlubricated conditions |
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| 作者姓名： | 易宏坤 张荻 范同祥 吕维洁 |
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| 作者单位： | State Key Laboratory of Metal Matrix Composites，State Key Laboratory of Metal Matrix Composites，State Key Laboratory of Metal Matrix Composites，State Key Laboratory of Metal Matrix Composites Shanghai Jiaotong University，Shanghai 200030，China，Shanghai Jiaotong University，Shanghai 200030，China，Shanghai Jiaotong University，Shanghai 200030，China，Shanghai Jiaotong University，Shanghai 200030，China |
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| 基金项目： | Project(G19990 64 90 7)supportedbytheNationalKeyFundamentalResearchandDevelopmentProgramofChina |
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| 摘 要： | 1 INTRODUCTIONAl Sialloyshavebeenwidelyusedasthetribo logicalcomponentsininternalcombustionenginesfortheirhighresistancetowearandseizure ,andhighspecificstrength .Therefore ,thewearbehaviorsofAl Sialloysagainstvariouscounterfaces (typicallyacastironcounterface)havebeeninvestigatedexten sively16 ] .Themutualtransferofmaterialbetweentwoslidingcounterfacesisinvariablyinvolvedinawearprocess ,especiallyunderdryorunlubricatedconditions ,leadingtotheformationofamechanicallymixedlayerattheworn…
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Microstructures of worn surface and wear debris of as-cast Al-17Si-xLa alloys under unlubricated conditions |
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| Abstract: | The tribological characteristics of hypereutectic Al-17Si-xLa alloys against heat-treated GCr15 bearing steel under unlubricated conditions were investigated using a block-on-ring type wear testing apparatus in air at room temperature. Microstructures and chemical compositions of worn surface and wear debris were characterized by means of SEM with EDS and XRD patterns. XRD results show that wear behaviors of Al-17Si-xLa alloys are similar and the typical worn surface is characterized by smooth region and crater region. The mechanically mixed layer (MML) and the wear debris are very similar in microstructures and chemical compositions, both containing the fine equiaxed aggregates and large plates and blocks from the both sliding counterparts (α(Al) and α-Fe) and some reaction products (ternary oxides, I.e. Al-Fe-O and Fe-Si-O). |
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| Keywords: | hypereutectic Al Si x La alloy dry sliding worn surface wear debris |
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