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The Effect of Ageing Time on Some Mechanical Properties of aluminum/0.5% Glass Reinforced Particulate Composite

Journal of Minerals and Materials Characterization and Engineering 2012年第9期11卷 919-923页

作者： Aondona .P. Ihom Nyior .G. Bem Emmanuel E. Anbua Joy N. Ogbodo Department of Mechanical Engineering Federal Polytechnic Bauchi-Nigeria Department of Metallurgical and Materials Engineering Ahmadu Bello University Zaria-Nigeria Department of Metallurgy National Metallurgical Development Center Jos PMB 2116 Jos Plateau State- Nigeria Department of Welding and Fabrication Scientific Equipment Development Institute (SEDI) Enugu-Nigeria

A particulate-hardened composite usually known as cermets with aluminum matrix and reinforced with ceramic particles from broken bottles was used to investigate the effect of ageing time on hardness and tensile strength. The samples used for the work were produced using stir-cast method and the samples were cast in metal moulds to improve on the surface finish and to obtain good cooling rate. The composite composition used was al/0.5% glass particles. The samples were treated at 500?C and quenched in water at 65?C. They were then aged at various temperatures ranging from 150?C - 210?C. The result of the hardness test showed that within the range of the ageing time selected the hardness increased with the ageing for all the ageing temperatures used. Variations were observed but this is normal in ageing, particularly when coherent and incoherent precipitates are formed at a point in time, or when over-ageing occurs. The plot of the tensile strength tests and the hardness tests, with ageing time showed the trend as observed. The highest hardness value of 37.3 HRB occurred after 5 hours of ageing likewise the highest tensile strength value of 398.36 N/mm2 occurred after 5 hours of ageing at the same ageing temperature of 190?C. The aged composite showed improved hardness and tensile strength when compared to as-cast value of 23.7 HRB for hardness and 253.12 N/mm2 for tensile strength respectively.

关键词： al/0.5% Glass Ageing Time Particulate Composite Mechanical Properties

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