Microstructure and mechanical properties of(TiB+TiC)/Ti composites prepared by microwave pressureless sintering
The(TiB+TiC)/Ti composites were prepared using microwave pressureless sintering technology.Graphite powder and TiB2 were selected as the C and B sources of the reinforcement phase.They were attached to the surface of the Ti matrix through ball milling,and reacted with the Ti matrix during sintering to generate TiC and TiB reinforcement phases in situ.In order to avoid the disadvantage of low accuracy in infrared temperature measurement,microwave power and sintering time were used as variables to explore the optimal conditions for preparing(TiB+TiC)/Ti composites,and the effect of microwave sintering process on microstructure and mechanical properties of the composites was studied.The results show that the composites prepared by sintering at 1 kW for 27.5 min has the best mechanical properties,with the ultimate compressive strength of 1633 MPa,the strain of 34.88%,and the microhardness of 367 HV0.2.With the increase of microwave power,the reinforcing phase coarsens and the mechanical properties of the composites decrease.The fracture surface of the composites exhibits mixed fracture characteristics of dimples and cleavage planes.
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