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Title: | An investigation into the manufacture and mechanical properties of an al-steel hybrid MMC |
Other Titles: | Al-steel hybrid MMC |
Authors: | Davenport, Rebecca A. |
Advisors: | Nadendla, H Eskin, D |
Keywords: | Impact test;Steel-fibre reinforcement;Induction Furnace |
Issue Date: | 2018 |
Publisher: | Brunel University London |
Abstract: | One of the most significant challenges in the composite development field is to find a low-cost manufacturing route capable of producing large volumes of material. This thesis develops and characterises a potential avenue for addressing this, an induction furnace-based process. This process produced a composite of A357 matrix and 10% wt Dramix 3D 80/30 SL steel fibres. Themethodwasevaluatedbymicrostructuralanalysisandoptimumcastingparameterswere approximated. The fibres were introduced to liquid A357 at 700◦C and the composite was brought to a measured temperature of 650◦C over not more than 120 seconds before being removed from the furnace and cooled. 10% wt was the ideal reinforcement ratio for this process. Characterising the tensile and compressive strength of the composite material, it reached a peak stress 130% higher than A357 produced under the same conditions, though the peak stresses were still20%oftheliteraturevaluesforT6temperedA357. Thissuggeststheneedfordevelopmentof a temper which does not degrade the properties of the composite. 3-point bending tests and some tensile specimens also showed post-failure strength. Under dynamic loading, the composite showed a peak stress in excess of 100 MPa without reaching maximum compression under SHPB loading, and comparable performance to SiC-reinforced MMCs under ballistic testing. The linear decrease in work-hardening with increasing distance from the impact site shows shock and pressure-pulse dissipation properties, attributed to the difference in acoustic impedance between the matrix and the reinforcement. |
Description: | This thesis was submitted for the award of Doctor of Philosophy and was awarded by Brunel University London |
URI: | http://bura.brunel.ac.uk/handle/2438/17033 |
Appears in Collections: | Brunel Centre for Advanced Solidification Technology (BCAST) Dept of Mechanical and Aerospace Engineering Theses |
Files in This Item:
File | Description | Size | Format | |
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FulltextThesis.pdf | 193.63 MB | Adobe PDF | View/Open |
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