Localized Strength Restoration of Aluminum 5083 with Ceramic Particles via Friction Stir Processing

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Authors
  1. Nolting, A.E.
  2. Larose, S.
  3. Cao, X.
  4. Munro, C.
  5. Amos, R.
  6. Monsarrat, B.
  7. Wanjara, P.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN)
Abstract
It has been well established that friction stir processing (FSP) can successfully be used to reduce flaws and repair defects, such as cracks and pores in a variety of alloys. When integrated with 3D robotic control, the FSP technology is a potential option for in-theatre repair or refurbishment of vehicle components. However, work-hardened aluminium alloys (AA), such as AA5083 can experience a degradation in strength during FSP due to recrystallization of the cold rolled microstructure, which may adversely affect the mechanical properties. In an effort to combat the softening phenomenon for a repair solution, a procedure for incorporating ceramic particles into AA5083 using FSP technology was successfully developed in order to locally enhance the hardness and yield strength. A surface layer, drilled with a discontinuous pattern of holes, was first filled using alumina powder and then this area was friction stir processed with up to three repeated linear passes to manufacture a metal matrix composite (MMC) surface layer. Targeting a penetration depth of 5 mm and an average reinforcement fraction of 10 vol. % alumina particles, a homogeneous particle distribution was achieved without the formation of any visible internal or surface defects. The resulting MMC layer had average increases of 35% in microhardness and 25% in yield strength at a penalty of 50% in ductility, compared to the parent metal.
Keywords
metal matrix composites;materials;aluminum;mechanical characterisation
Report Number
DRDC-RDDC-2018-P032 — External Literature
Date of publication
01 Apr 2018
Number of Pages
18
Reprinted from
ISBN: ISBN 978-92-837-2173-4, DOI: 10.14339/STO-MP-AVT-267-14-PDF, Pages: 14-1 14-18
DSTKIM No
CA046182
CANDIS No
806786
Format(s):
Electronic Document(PDF)

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