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High strength Aluminium matrix composites reinforced with nanoparticulate materials

Wednesday (08.11.2017)
16:40 - 17:00
Part of:

Aluminium alloys are reinforced with different nanoparticulate materials using a simple powder metallurgy approach. Both micro-scale matrix powder and nanopowders are mixed in a high energy ball mill and then hot pressed. For high reinforcement contents, the hardness of the composites increases up to 7-8 times while the ultimate tensile strength increases by a factor of 4. However, the ductility is inversely dramatically low, below 1%.

An optimization of the processing conditions allows reaching high strength and high elongation at rupture. For instance, a novel planetary ball cube-mill proved to be three times more efficient than conventional ball mills. The hot pressing cycle is also adapted including a degassing/annealing step. Thus the UTS and elongation at rupture of AlMg5 reinforced with nano-alumina particles could be tailored linearly between [560 MPa - 4%] to [400 MPa - 20 %] depending on the nanoparticles content. No further treatment is necessary for achieving these high strength-ductility values. Other processing routes like forging, HIP and Spark Plasma Sintering are shortly compared. Finally the weldability of these composites is demonstrated.

Dr. Marc Leparoux
Swiss Federal Laboratories for Materials Science and Technology (EMPA)
Additional Authors:
  • Kaspar Kallip
    Empa/Tallinn University
  • Dr. N. Kishore Babu