1 results listed
Particle-reinforced metal matrix composites (MMCs) which provide advanced mechanical and physical
properties combine the advantages of both the matrix and the reinforcing materials. Although, several metals have been
used as matrix materials to develop new composites, aluminum alloys are the most common used materials for aircraft,
automotive and military industries. High strength to weight ratio, high ductility, high stiffness and good wear resistance
of Al alloy are superior properties which increases their usability in the fabrication of metal matrix composites [1].
Aluminum alloys are considered as important structural materials in various applications, especially in automotive and
aerospace industries, with the high strength alloy AA2024 being the most recognized, feasible aerospace alloy [2].
MMCs has been widely used in engineering application because of their favoruable properties such as high
strength to weight ratio, lighter weight, lower cost, and good wear behaviour. In this study, the wear performance of
Al2024 based composites reinforcement with hexagonal boron nitride (hBN) have been investigated. The composites
were fabricated by powder metallurgy method which is broadly preferred because of its low cost, high volume production,
ease of operation, and attractive manufacturing process. To product the AA2024-hBN composites, AA2024 alloy powders
(d50: 56 µm) with 0, 0.25, 0.5 and 1 wt.% of hBN particles (d50: 50 µm) were milled with tungsten carbide balls (5mm)
in tungsten carbide vial using a planetary ball mill (Retsch PM PM 100) for 1 hour. The milled composite powder mixtures
were put into a steel die and cold pressed at 300 MPa and then hot-pressed at 560 °C and a pressure of 600 MPa for 3
hours. Hardness values of the samples was determined by the way of Brinell method using a 31.25 kg load and 15 s
indentation time on the Brinell hardness machine and the hardened steel ball used in this process have diameter of 2.54
mm. Wear behavior of the composites was examined by using a ball-on-disk wear tester. A H11 hot-work tool steel ball
with diameter of 10 mm and mirror-like surface was contacted on the surface of disk at either 10 or 20 mm from the disk
center under the loads of 5, 10, 20 and 40N.
International Symposium on Light Alloys and Composite Materials
UHAKS
Aykut Çanakçı
Kürşat Alp Arpacı
Müslim Çelebi
Serdar Özkaya
A.Hasan Karabacak