DAMPING CAPACITY OF Bi2O3–COATED Al18B4O33 WHISKER REINFORCED Al MATRIX COMPOSITES

doi:10.3724/SP.J.1037.2010.00067

Acta Metall Sin

2010, Vol. 46

Issue (8): 979-983 DOI: 10.3724/SP.J.1037.2010.00067

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DAMPING CAPACITY OF Bi₂O₃–COATED Al₁₈B₄O₃₃WHISKER REINFORCED Al MATRIX COMPOSITES

LIU Gang ¹, SUN Yali ², HU Jin ¹, ZHOU Ke ¹

1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001
2. Department of Mechanical Technology, Yantai Engineering & Technology College, Yantai 264006

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LIU Gang SUN Yali HU Jin ZHOU Ke. DAMPING CAPACITY OF Bi₂O₃–COATED Al₁₈B₄O₃₃WHISKER REINFORCED Al MATRIX COMPOSITES. Acta Metall Sin, 2010, 46(8): 979-983.

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Abstract

In metal matrix composites (MMCs), the reinforcement/matrix interface has a profound effect on its overall properties. The proper selection or design of the interfacial phase plays a vital role in optimizing the final properties of MMCs, in which high damping capacity is one of the most important properties of materials used in engineering structure. Although the damping mechanism of discontinuously reinforced aluminum composites has been extensively studied, only a few of researches have been reported on the effect of whisker coatings on the damping capacity of MMCs. In this paper, the pure aluminum matrix composites reinforced by alumina borate (Al₁₈B₄O₃₃) whisker with and without Bi₂O₃ coatings were separately fabricated by squeeze and the volume fraction of Al₁₈B₄O₃₃ whisker in these composites is about 20%. The mass ratios between Al₁₈B₄O₃₃ whisker and Bi₂O₃ were set as 6∶1, 10∶1 and 20∶1, respectively. The effects of coating contents and strain amplitudes on the damping properties of the coated composites at various temperatures and frequencies were examined. Two damping peaks (P1 and P2) in the coated composites at around 80 and 285 ℃ were observed. The results of damping characterization indicate that the damping capacity of the coated composites strongly depends on the content of coatings and strain amplitudes. Moreover, P2 increases more rapidly with increasing the coating content and strain amplitude. P1 is related to dislocation motion and interfacial slip between the whisker and Bi phase. The damping mechanism of P2 changes with the increase of stain amplitude.

Key words: Al matrix composite material Al₁₈B₄O₃₃ whisker Bi₂O₃ coating interface damping capacity

Received: 02 February 2010

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00067 OR https://www.ams.org.cn/EN/Y2010/V46/I8/979

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