COMPOSITE_MATERIALS_module_5_MMC_BC

COMPOSITE_MATERIALS_module_5_MMC_BC - 1 ME 624: MECHANICS...

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Unformatted text preview: 1 ME 624: MECHANICS OF COMPOSITE MATERIALS Module 5: Metal Matrix Composites (MMC) (Material Based on: Composite Materials by Matthews & Rawlings and other References) 2 . INTRO TO MC’s 3 etal Matrix Composites (MMC) :History 1960’s witnessed the introduction of the first MMCs namely Al or Cu matrix reinforced with 30-70% of continuous B or W fibers. Not unlike PMCs, the applied load was carried by the fiber in such MMCs and the matrix’s microstructure and strength were relatively unimportant. iscontinuously reinforced MMCs were developed in the 1980’s with attention focused on Al-based matrices reinforced with 5-50% volume fraction of SiC particles, Al2O3 particles, or Al2O3 short fibers . A combination of good properties, low cost, and high workability had made them attractive for many applications. 4 etal Matrix Composites (MMC) : History In MMCs, reinforcement is utilized to improve the ductile metal matrix’s - stiffness, - strength, - abrasion resistance, - creep resistance, - thermal conductivity, and - dimensional stability. Among the important MMCs: Boron Carbon Al 2 O 3 SiC Aluminum Aluminum Aluminum or Mg Al Fiber Matrix 5 etal Matrix Composites (MMC) : 6 I. LASSIFICATION F MMC’s 7 etal Matrix Composites (MMC) : CLASSIFICATION MCs may be subdivided according to whether the reinforcement is in the form of: (a) Continuously- reinforced MMCs- Long aligned monofilament fibers- Long aligned multifilament fibers (b) Discontinuously- reinforced MMCs- Short fibers & whiskers (with or without a degree of alignment)- Particles (which are approximately equiaxed) (c) Layered MMC Systems 8 etal Matrix Composites (MMC) : CLASSIFICATION In terms of commercial importance , this classification is upside-down: 5.ii.a. Layered MMCs 5.ii.b. Discontinuously reinforced MMCs 5.ii.c. Short fibers & whiskers reinforced MMCs 5.ii.d. Long aligned monofilament fibers reinforced MMCs 5.ii.e. Long aligned multifilament fibers reinforced MMCs 9 etal Matrix Composites (MMC) : CLASSIFICATION .ii.a. Layered MMCs class of MMCs which attracted attention recently is that in which two constituents are in the form of alternate layers (tape), i.e., metal/ceramic. Insert plot 10 etal Matrix Composites (MMC) : CLASSIFICATION .ii.b.Discontinuously reinforced MMCs hile much of the interest focuses around Al alloy matrices , there is also strong interest in Ti-, steel-, and magnesium-based composites. The particulate material employed is mainly SiC or Al 2 O 3 particles but also TiB 2 , SiO 2 , TiC, WC, ZrO 2 , .. The attributes exhibited by particulates for MMC reinforcement are: high stiffness low density high hardness adequate toughness good availability / low cost for powder (~1-20 μ m diameter) 11 etal Matrix Composites (MMC) : CLASSIFICATION .ii.b.Discontinuously reinforced MMCs his E vs. density plot shows that for a given ratio a reinforcement lying far towards the upper left from the line on which the matrix lies will be efficient, where as one lying close to that line will provide little benefit....
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This note was uploaded on 02/07/2011 for the course MECH 624 taught by Professor Drramseyhamade during the Fall '10 term at American University of Beirut.

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COMPOSITE_MATERIALS_module_5_MMC_BC - 1 ME 624: MECHANICS...

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