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Development of M▫$g_2$▫Si-Mg-TiC and M▫$g_2$▫Si-TiC/Ti▫$B_2$▫ composites for lightweight applications
Kevorkijan, Varužan
In this work, the preparation of various lightweight Mg-Mg2Si-TiC metal matrix composites and Mg2Si-TiC/TiB2 ceramic composites has been described and the influence of their structure on mechanical ...response was discussed. Mg-Mg2Si-TiC composites with continuous magnesium matrix densified to > 95% T.D. were fabricated by pressureless reactive infiltration of performs made from Mg2Si and TiC powders. Infiltration was performed in an argon atmosphere at temperatures 700, 800 and 900°C for 1 h. Trials made with Mg2Si preforms reinforced with TiB2 were unsuccessful. Mg2Si-TiC/TiB2 ceramic composites densified to > 97% T.D. were prepared by pressureless reactive sintering of tables made from Mg- 2Si and TiC or TiB2 powders. The reactive sintering was performed in the temperature range 1055 to 1065°C for 0.5 to 1h under a protective argon atmosphere. The phases present in the obtained composite samples have been identified by scanning electron microscopy/energy dispersiveXray spectroscopy. In addition, room temperature tensile tests (Rm, Rp 0.2, A) and hardness measurements (HV) were also undertaken. The results have shown that Mg- Mg2Si-TiC composites are with mechanical properties (Young modulus: 88-97 GPa, tensile strength: 186-197 MPa, hardness: 4.9-5.1 GPa and fracture toughness: 6.4-6.5 MPa m1/2) superior to that of conventional magnesium alloys while Mg2Si-TiC/TiB2 samples combined enhanced hardness (9-10GPa) and fracture toughness (1.4-2.3 MPa m1/2) achieved in low density (2.2.-2.5 g/cm3) composite structure.
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