AZ31–WC纳米复合材料的纳米压痕和抗划伤性能

IF 2.4 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Molecular and Engineering Materials Pub Date : 2019-09-01 DOI:10.1142/s2251237319500072
Sudip Banerjee, S. Poria, G. Sutradhar, P. Sahoo
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引用次数: 10

摘要

本工作考察了WC纳米颗粒对镁基金属基纳米复合材料的纳米硬度、弹性模量和划痕磨损行为的影响。采用配备超声波振动器的搅拌铸造炉来制备Mg–WC纳米复合材料。采用扫描电子显微镜(SEM)、能量色散X射线分析(EDAX)和X射线衍射(XRD)对基础合金和Mg–WC纳米复合材料进行了表征。维氏显微硬度计用于获得所制备材料的显微硬度值。进行纳米压痕测试以发现WC的wt.%对机械性能的影响,即纳米硬度和弹性模量。与只有2[公式:见正文]wt.%的基础合金相比,纳米硬度和弹性模量分别增加了近122%和169.37%WC作为钢筋存在。进行了划痕试验,以发现WC的wt.%和施加的载荷对基础合金和Mg–WC纳米复合材料的划痕诱导磨损和摩擦系数(CoF)的影响。磨损量也随着镁合金中WC重量百分比的增加而不断减小。纳米复合材料的COFs几乎是恒定的,但它们倾向于随着WC重量%的增加而增加。最后,对划痕槽的SEM显微照片进行了分析,以找出磨损机理。研究发现,磨料磨损机制是Mg–WC纳米复合材料划痕的主要机制。
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Nanoindentation and Scratch Resistance Characteristics of AZ31–WC Nanocomposites
This work examines the effects of WC nanoparticles on nanohardness, elastic modulus and scratch-induced wear behavior of Mg-based metal matrix nanocomposites. Ultrasonic vibrator-equipped stir casting furnace is used to fabricate Mg–WC nanocomposites. Scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDAX) and X-ray diffraction (XRD) are employed to conduct the characterizations of base alloy and Mg–WC nanocomposites. Vickers microhardness tester is used to obtain the microhardness values of the fabricated materials. Nanoindentation tests are performed to find the effect of wt.% of WC on the mechanical properties, i.e., nanohardness and elastic modulus. Nanohardness and elastic modulus present nearly 122% and 169.37% increments, respectively, compared to the base alloy when only 2[Formula: see text]wt.% of WC is present as reinforcement. Scratch tests are performed to find the effects of wt.% of WC and applied load on the scratch-induced wear and coefficient of friction (CoF) of the base alloy and Mg–WC nanocomposites. Wear volume also decreases continuously with increase in the weight percentage of WC in magnesium alloy. The COFs of nanocomposites are almost constant but they are inclined to increase with the increase in wt.% of WC. Finally, SEM micrographs of scratch grooves are analyzed to find the wear mechanisms. Abrasive wear mechanism is found to be the dominant one regarding the scratch of Mg–WC nanocomposites.
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来源期刊
Journal of Molecular and Engineering Materials
Journal of Molecular and Engineering Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
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