Microstructures and Properties of In Situ (TiB_2p+TiB_w)/Cu Composites with Different Ce Content

Abstract

TiB 2p þ TiB w )/Cu composites are prepared by in situ reaction casting. The effect of Ce content on the microstructures, electrical conductivity, and tensile strength of (TiB 2p þ TiB w )/Cu composites are studied. The results show that the right amount of Ce can significantly refine the reinforcements and the copper matrix grains, and improve the morphology and distribution of the reinforcements. Correspondingly, the electrical conductivity and tensile strength of the composites also vary with the Ce contents, but the excess Ce can result in a deterioration of microstructures and properties, and the reasons are also discussed. Finally, a better comprehensive property (78.4 %IACS and 671 MPa) is obtained when the Ce content is 0.04 wt%, which is consistent with the microstructures.

Research Progress in Interfacial Characteristics and Strengthening Mechanisms of Rare Earth Metal Oxide-Reinforced Copper Matrix Composites

“…Cao et al studied the effect of Ce content on the microstructure conductivity and tensile strength of (TiB 2p + TiB w )/Cu composites. The results verify that an appropriate amount of Ce can significantly refine the grain size of the reinforcement and the copper matrix to improve the morphology and distribution of the reinforcement, as shown in Figure 11 [ 35 ]. The tensile strength and electrical conductivity of the composites also change with the content of Ce, but excessive Ce leads to deterioration of the microstructure and the properties of the composites [ 35 ].…”

“…The results verify that an appropriate amount of Ce can significantly refine the grain size of the reinforcement and the copper matrix to improve the morphology and distribution of the reinforcement, as shown in Figure 11 [ 35 ]. The tensile strength and electrical conductivity of the composites also change with the content of Ce, but excessive Ce leads to deterioration of the microstructure and the properties of the composites [ 35 ]. When Ce content is 0.04 wt.%, the composite has better comprehensive properties, IACS is 78.4% and strength is 671 MPa, which is consistent with the microstructure [ 35 ].…”

“…The tensile strength and electrical conductivity of the composites also change with the content of Ce, but excessive Ce leads to deterioration of the microstructure and the properties of the composites [ 35 ]. When Ce content is 0.04 wt.%, the composite has better comprehensive properties, IACS is 78.4% and strength is 671 MPa, which is consistent with the microstructure [ 35 ]. Cao et al reported the effect of rare earth elements on (TiB 2p + TiB w )/Cu composites.…”

“… EBSD IPF maps and copper grain size distribution of as-cast (TiB 2p + TiB w )/Cu composites: ( a , b ) without rare-earth Ce; ( c , d ) with 0.04 wt.% Ce [ 35 ]. Reprinted/adapted with permission from Ref.…”