Microstructures of worn surface and wear debris of as- cast Al-17Si-x La alloys under unlubricated conditions

来源期刊：中国有色金属学报(英文版)2003年第3期

论文作者：易宏坤 张荻 范同祥 吕维洁

文章页码：558 - 563

Key words：hypereutectic Al-SixLa alloy;dry sliding; worn surface; wear debris

Abstract: The tribological characlerislics of hypereuleclic Al-17Si-x La alloys against heal- trealed GCr15 hearing steel under unlubricared condilions were mvest.igalecl using a block-orrring type wear tesling apparatus in air al. room tempera-ture. Microstruciures and chemical composnions of worn surface and wear debris were characcerized by means of SEM with EDS and XRD patlerns. XRD resulls show thal wear behaviors of Al 17SrxLa alloys are similar and the Lypical worn surface is characterized by smoolh region and crater region. The mechanically mixed layer ( M ML) and the w ear debris are very similar in microstructures and chemical composilions, bolh conlaining the fine equiaxed aggregates and large plates and blocks from the both sliding counterparts (α(Al) and α-Fe) and some reaction products (lernary oxicles, i. e.Al-Fe-O and Fe-Si-O) .