Mechanical properties of Al-60 Pct SiCp composites alloyed with Mg


Ahlatci H., Candan E., Cimenoglu H.

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, ss.2127-2141, 2004 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: Konu: 7
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1007/s11661-004-0161-1
  • Dergi Adı: METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
  • Sayfa Sayıları: ss.2127-2141

Özet

In the present work, the effect of an Mg addition on the mechanical properties of the Al-60 vol pet SiCp composites were investigated by uniaxial compression, three-point bending, impact and wear tests (composite-metal and composite-abrasive types). The composites were produced by the pressure-infiltration technique. The composition of the Al matrix was varied between 0 and 8 pet Mg. The mean diameter of the SiC particles was 23 mum. Upon addition of Mg, Mg2Si precipitated in the matrix and the amount of the porosity dramatically decreased. Mg-alloyed-matrix composites exhibited higher strength, lower toughness, and higher wear resistance than pure-Al-matrix composites. During composite-metal wear testina, wear progressed in two sequential periods (running-in and steady state). Weight loss during wear testing, decreased with increasing Mg content of the matrix. The degree of improvement of abrasive resistance depended on the abrasive-grain size. Above 200 degreesC, the composite-abrasive wear resistance decreased with increasing test temperature for all materials.