Effects of CeO2 additive on the microstructure and mechanical properties of in situ TiB2/Al composite

Synthesis and characterization of in situ formed titanium diboride particulate reinforced AA7075 aluminum alloy cast composites

“…The in situ formed TiB 2 particles exhibit various shapes such as spherical, hexagonal and cubic. Some investigators observed the shape of TiB 2 particles to be hexagonal [25][26][27]32] while some other reported spherical and cubic structure [21,29,30]. It is evident from Fig.…”

“…Some studies on aluminum alloy reinforced in situ formed TiB 2 particles were reported in the literatures [21][22][23][24][25][26][27][28][29][30]. Han et al [21] prepared Al/TiB 2 AMC by the in situ reaction of K 2 TiF 6 and KBF 4 to molten aluminum and found uniform distribution of TiB 2 particles in the eutectic structure.…”

“…Mallikarjuna et al [28] employed exothermic reaction process using K 2 TiF 6 and KBF 4 salts to produce AA2014/TiB 2 AMC and investigated the effect of reaction time on the grain size and wear rate of the AMCs. Xue et al [29] reported that the addition of CeO 2 to the in situ reaction of K 2 TiF 6 and KBF 4 lead to improved distribution of TiB 2 particles and property enhancement of Al/TiB 2 AMC. Li et al [30] developed Al/TiB 2 AMC by the in situ reaction of Ti sponge and Al-3B mater alloy and analyzed the orientation relationships between Al and TiB 2 using an edge-to-edge matching model .…”

Effect of La on microstructures and mechanical properties of Cu/Ti3SiC2/C nanocomposites sintered by vacuum hot-pressing and hot isostatic pressing

“…Moreover, the rare earth elements have high chemical activity, unique physical properties and stable chemical properties, which can significantly refine the grain structure of the alloy matrix, remove impurities as well as significantly improve the tensile strength of the material [9,10]. Xue et al [11] showed that rare earth metal was a surface active element, which could reduce the surface tension of the metal matrix and improved the fluidity of the metal matrix. The weakness of surface tension resulted in a corresponding increase in the wettability of the reinforcing phase particles in the metal matrix, thus surface diffusion coefficient of the reinforcing phase particles was increased.…”

Effects of rare earth oxide La2O3 on microstructure and properties of Al2O3/Al composites

“…[5][6][7] Research shows that rare earth oxides are a kind of surface active element with special behaviours in aluminium alloys that can increase the density of sintered alloys, refine the microstructures and improve mechanical properties. [8][9][10][11][12] Therefore, in this paper, Al 2 O 3 /Al composites with different contents of rare earth La 2 O 3 oxides were prepared by means of powder metallurgy. The influences of the La 2 O 3 contents on the microstructure and properties of the Al 2 O 3 /Al composite were studied.…”