Effect of T6 heat treatment on friction and wear properties of SiCp/Al composites

doi:10.13251/j.issn.0254-6051.2020.03.022

Abstract

Abstract:

SiCp/Al composites with different SiC particle volume fractions (30%, 35% and 40%) were prepared by means of powder metallurgy. The changes of average friction coefficient and wear rate of SiCp/Al composites under different volume fraction and T6 heat treatment were studied by using MMU-5GA microprocessor controlled high temperature friction and wear tester. The wear morphology of SiCp/Al composites was analyzed by means of scanning electron microscopy, and the friction and wear mechanism was discussed. The results show that when the volume fraction of SiC particles varies from 30% to 40%, the wear resistance decreases with the increase of the volume fraction. In a certain range of 30%-35%SiC particle volume fraction, SiC particles bond well with the matrix, as a hard point, SiC particles play a dual role in resisting wear and restricting the plastic deformation and wear of the matrix alloy. However, when the SiC content is too high, the bonding between the particles and the matrix is not close, the particles are easy to fall off during wear, and the wear resistance of the composites decreases. The average friction coefficient and wear rate of the composite decrease after heat treatment, because the strength and hardness of the sample after heat treatment are improved, so does the wear resistance of the sample. At room temperature, the wear mechanism of composites is mainly abrasive wear at the early stage of wear and abrasive wear and peeling wear coexist at the wear stage.

Key words: SiCp/Al composites, friction and wear, SiC particles, heat treatment, wear mechanism

CLC Number:

Zhu Shuang, Liu Yun, Xie Liming, Hao Shiming. Effect of T6 heat treatment on friction and wear properties of SiCp/Al composites[J]. HTM, 2020, 45(3): 114-118.

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