Abstract
Abstract Zr-based bulk metallic glasses (BMGs) are widely used as mechanical components due to their excellent properties and high glass-forming ability. However, there is a lack of research concerning the tribological behavior of BMG versus BMG. The sliding characteristics of Vitreloy-105 (Zr52.2Cu17.9Ni14.6Al10Ti5 at.%) were studied in air using a pin-on-disk apparatus equipped for continuous measurement of friction force and without lubrication. The counterface material was the same BMG. The structure, thermal stability, and wear morphology were examined by X-ray diffraction, differential scanning calorimetry, non-contact profilometer, and scanning electron microscopy. For a normal load applied (10.0, 20.4 and 38.2 N) at constant 233 rpm the coefficient of friction ranged from 0.30 to 0.36 at steady state. Average wear rate was more pronounced on the pins under higher load and the predominant wear mechanism observed was adhesive, with presence of peeling-off and micro-cracks accompanied by some grooves and abrasive wear at lower loads.
Highlights
bulk metallic glasses (BMGs) are metastable materials produced at cooling rates above the critical cooling rate necessary to avoid the nucleation of crystals
X-ray diffraction (XRD) patterns obtained after wear tests on Vit-105 plates are without any visible Bragg peaks, suggesting the structure of the alloy is amorphous after casting, and there was no crystallization induced by neither plastic deformation and/or heating, which is consistent with the results reported elsewhere[17]
This paper has investigated the friction and wear behavior of BMG Vitreloy-105 sliding against itself
Summary
BMGs are metastable materials produced at cooling rates above the critical cooling rate necessary to avoid the nucleation of crystals. The lack of long-range atomic order can provide properties to amorphous alloys better than in conventional crystalline ones[1]. These materials have been emerging due to their excellent combination of mechanical properties. The absence of grain boundaries provides high corrosion resistance[5,6], and wear resistance[7,8] Due to these properties, many researchers have been studying BMGs for improvements or new applications in several areas, such as structural materials[9], sports applications[10], biomaterials[11], robotics, and aerospace industry[12,13]
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