Microstructure and mechanical behavior of AA2024 aluminum matrix composites reinforced with in situ synthesized ZrB2 particles

作者：Muralidharan N^*; Chockalingam K; Dinaharan I; Kalaiselvan K

来源：Journal of Alloys and Compounds, 2018, 735: 2167-2174.

DOI：10.1016/j.jallcom.2017.11.371

• Metal matrix composites
• Casting
• Microstructure
• Tensile strength

Preparing aluminum matrix composites (AMCs) using in situ method results in many desirable benefits. This paper is focused on preparing AA2024/(0, 2.5, 5, 7.5 and 10 wt%) ZrB2 AMCs by Al-K2ZrF6-KBF4 reaction system. The inorganic salts were added to molten aluminum alloy at an elevated temperature of 850 degrees C. The prepared AMCs were studied by applying conventional microcopy and advanced characterization techniques. XRD peaks confirmed the successful synthesize of ZrB2 particles. No other phases such as Al3Zr and AlB2 were detected in appreciable quantity. There was a refinement of grains in the composite due to ZrB2 particles. Two kind of distribution was observed in the micrographs. Particle clusters trapped within the grain boundaries were observed with increased weight fraction of particles. ZrB2 particles were observed to be subemicron and nano level in size and characterized by proper interfacial bonding with the aluminum matrix. The thermal misfit generated lot of strain fields in the aluminum matrix. The mechanical properties were improved remarkably by the incorporation of ZrB2 particles and the possible strengthening mechanisms were discussed.

• 出版日期2018-2-25