Effect of In Situ Reaction Temperature on the Microstructure and Mechanical Properties of 3 wt.% ZrB2/A356

Li, Hui; Jiao, Lei; Huang, Xinpeng; Liu, Fan; Lu, Shengbo; Li, Yanli; Li, Chuying; Qiao, Yanjiang

doi:10.1007/s11665-021-05943-6

Cited by 8 publications

(1 citation statement)

References 22 publications

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“…It was found that the addition of nano-ZrB 2 improved the tensile strength of the composites [10,11]; I Dinaharana et al prepared in situ ZrB 2 /AA6061 composites with different particle volume fractions by the reaction of salt and molten aluminum. It was found that the hardness, tensile strength and wear resistance of the composites increased significantly with increasing mass fraction of reinforcing particles [12,13].…”

Section: Introductionmentioning

confidence: 99%

Preparation of in-situ ZrB2/A356 composites and high-temperature tribological studies

Yuanpeng

et al. 2022

Mater. Res. Express

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The ZrB2/A356 composite material was prepared by using chemical in-situ reaction technology. The high-temperature friction and wear test of ZrB2 /A356 aluminum matrix composites was carried out. The friction and wear test temperatures were normal temperature, 50°C, 100°C, 150°C, 200°C, 250°C, and 300°C. XRD, TEM, SEM and XPS were used to analyze the microstructure, phase and the formation of surface compounds of the composites under different wear temperatures. The results show that the composite phase is composed of ZrB2 and ɑ-Al, and there is a small amount of AlSi eutectic phase；ZrB2 particles are small, hexagonal nearly elliptical, flocculent and well bonded to the matrix; The wear properties of composites are susceptible to temperature changes, and the wear rate is small below 200 °C. The main wear mechanisms are oxidation wear and abrasive wear. When the temperature reaches above 250 °C, the wear rate begins to rise sharply, and a large number of plastic deformation traces and wear debris appear on the surface of the wear spot, and the surface of the wear debris adheres to the protrusions. The primary wear mechanism is adhesive wear. In the stages of oxidative wear, and abrasive wear, although the friction coefficient changes, it is stable. But in the adhesive wear stage, the friction coefficient becomes very unstable and a sharp peak appears. XPS analysis showed that the compounds formed in the wear scar were mainly Al2O3.

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