Strengthening mechanisms in ultrasonically processed aluminium matrix composite with in-situ Al3Ti by salt addition

Effect of Ca addition on solidification microstructure of hypoeutectic Al-Si casting alloys

“…Nayak et al [26] believed stable reinforcement phases like Al 3 Ti, Al 3 Ni, Al 3 Fe and Al 3 Zr had good interfacial bonding with Al matrix. Gupta et al [27] found the Al 3 Ti particles generated in the melt promoted heterogeneous nucleation and had significant grain refinement effect. In addition, because of a higher melting point (~1,623 K), Al 3 Ti was stable at lower temperatures.…”

Effects of Co content in TiO2–Co composite prepared by alloying–recomposition–oxidation–sintering process on its mechanical properties and microstructure

“…26 In order to investigate the effects of the Co content on the microstructures and the mechanical properties of the TiO 2 -Co composites prepared by the AROS process, the Ti 84 Co 16 , Ti 75 Co 25 , Ti 67 Co 33 , and Ti 60 Co 40 alloy powders were prepared; XRD patterns of these alloy powders are shown in Figure 2. The Ti 84 Co 16 and Ti 75 Co 25 alloy powders consisted of Ti and CoTi 2 phases, the Ti 67 Co 33 alloy powder consisted of a single CoTi 2 phase, and the Ti 60 Co 40 alloy powder consisted of CoTi 2 and another intermetallic phase of CoTi. The nitrification of these alloy powders with different Co contents was performed by milling in a nitrogen atmosphere for 25 h using a planetary ball mill.…”

“…The produced ingots of Ti 67 Co 33 and Ti 60 Co 40 were crushed and sieved to particle sizes smaller than 120 mm. The Ti 84 Co 16 and Ti 75 Co 25 alloys were prepared by adding a pure Ti powder (purity: 99.9%, 100 mesh, Sejong Materials Ltd) into the crushed Ti 67 Co 33 alloy powder. The prepared alloy powders were nitrified to TiN-Co composites by planetary high-energy ball milling under a nitrogen gas atmosphere for 25 h. Approximately 20 g of the alloy powders was placed into a stainless-steel vial with stainless balls (diameter: 10 mm).…”

“…For an Al 2 O 3 -Ni composite, the flexural strength and the fracture toughness increase with the Ni content up to 10 vol%, followed by decrease despite the formation of a spinel phase. 14,15 In order to overcome these problems from the poor adhesion of the metallic binder, new processes for manufacture of ceramic-metal composites have been studied such as controlled oxidation of metallic alloys, 16 liquid stirring process coupled with ultrasonication, 17 and cation exchange using zeolites. [18][19][20] However, these methods also have drawbacks such as the use of expensive reactants and their intrinsic processing difficulties.…”

Correlations to Predict Microstructure and Mechanical Properties of Ultrasonically Cast Metal Matrix Nanocomposites as a Function of Treatment Time

“…In addition, acoustic cavitation generates localized high‐temperature spots that can remove species adsorbed on the surface of the nanoparticles, thus improving wettability and integration with the matrix. The fine‐grained microstructure, distribution of high strength nanoparticle reinforcement, and their bonding with the metal matrix are expected to result in improved mechanical properties of the composites. Thus, UST, owing to these attributes, harbors the significant potential to be developed into an advanced processing route for manufacturing high‐performance MMCs.…”