Friction And Wear Properties Of Zr-based Bulk Amorphous Alloy

To study the friction and wear characteristics of the Zr41Ti14Cu12.5Ni10Be22.5bulkamorphous alloy (Zr-BMG),the friction-wear behaviors of Zr-BMG against GCr15steel,20Cr alloy steel and the bulk amorphous alloy itself are investigated respectively bymeans of pin-disk friction-wear test.The Zr-BMG cast rods (pin samples) and disks (disk samples) are prepared using acombined non-consumable electrode arc meltingand and copper mold casting technique,and the disk samples are manufactured of commercial GCr15steel and20Cr alloy steel.The friction-wear behaviors of the three friction pairs (Zr-BMG/GCr15,Zr-BMG/20Cr and Zr-BMG/Zr-BMG) were performed with varied loads (100N,125Nand150N), rotation speeds (50rpm,75rpm and100rpm) and friction-wear times (30min,45min and60min). The results show that the friction coefficient varies from0.05to0.45at125N,75rpm and30min for Zr-BMG/GCr15friction pair and0.15to0.4forZr-BMG/20Cr, while0.02to0.4for Zr-BMG/Zr-BMG. It is also discovered with theanalysis of pin wear loss of Zr-MBG that the wear loss is the least in the case of Zr-BMGbeing the mating plate. The XRD data of Zr-BMG after friction and wear show that nocrystallization occurred in Zr-BMG. during the friction-wear test. By using the scanningelectron microscope (SEM), the morphology characteristics of Zr-BMG pin after frictionand wear was observed, and then the friction-wear behaviors of Zr-BMG, GCr15steel and20Cr alloy under different conditions were analyzed and discussed. It shows that thefriction-wear behavior of Zr-BMG is mainly subject to abrasive wear, companied with fewfatigued wear, being quite different from that of GCr15steel and20Cr alloy, which aremainly subject to fatigued wear.