The effect of fiber volume fraction on the properties of Al-α-Al2O3 metal matrix composites View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1991-09

AUTHORS

S. Choudhury, E. I. Meletis

ABSTRACT

The effect of α-Al2O3 fiber volume fraction on the microstructure, mechanical properties, corrosion behavior, and hydrogen embrittlement of Al-3Li-α-Al2O3 composites was investigated. Tests were conducted on unidirectional specimens with 35%, 39%, and 47.5% fiber volume fractions. The results showed that 3 wt% Li additions to the Al matrix were effective in producing excellent adhesion between the matrix and the fibers through the development of a compatible reaction zone. The thickness of this zone was found to be fairly uniform (0.6-1 μm) for all three fiber volume fractions. The experimentally determined values of elastic modulus were in agreement with those predicted by the rule of mixtures. Also, the tensile strengths obtained were consistent and within the expected range. Fracture analysis indicated mostly planar fracture surfaces with very limited fiber pullout. The fibers failed in a brittle intergranular fashion whereas the matrix exhibited a dimpled rupture. Alternate immersion and anodic polarization testing in 3.5% NaCl aqueous solution showed that Li additions and presence of fibers and reaction zone do not produce any corrosion susceptibility. On the contrary, all three composites exhibited high corrosion resistance. Finally, dynamic cathodic charging experiments showed that the composites were highly resistant to hydrogen embrittlement. More... »

PAGES

183-197

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02834177

DOI

http://dx.doi.org/10.1007/bf02834177

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1008008933


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