Abrasive Wear Behavior of Al–4Cu–1.5Mg–WC Composites Synthesized through Powder Metallurgy

Different Al–4Cu–1.5Mg/WC composites were synthesized through powder metallurgy to establish the effect of WC particle addition on the abrasive wear behavior of an Al–4Cu–1.5Mg (wt. %) alloy. The wear tests were performed using a pin-on-disc tribometer at room temperature in dry conditions using SiC abrasive sandpaper as a counterbody and tribometer of linear configuration. The results showed that WC additions increase the hardness of the Al–4Cu–1.5Mg alloy due to the strengthening effect of particle dispersion in the aluminum matrix, which generates an improvement in the wear resistance of the composites by preventing direct contact of the sample with the counterbody, in turn delaying the plastic deformation phenomena responsible for the degradation sequence. In addition, the dominant wear mechanism was abrasive wear, and the increased friction coefficient did not bring a rapid wear rate, which was related to the enhanced deformation resistance due to the high hardness

Influence of Rare Earths Additions on the Microstructure and Hardness of Heat-treated Nanostructured Superalloy Inconel 718

The superalloy Inconel 718 is greatly employed in high-temperature applications due to its principal characteristics: high resistance to oxidation and excellent mechanical performance at elevated temperatures; hence, its main uses are in aeronautics and aerospace engines, nuclear power generation and petrochemical industries

Effect of Ni additions and hot deformation on precipitation behavior and hardness in AleSieMg aged alloys

Additions of 1e2 Ni (wt. %) and hot deformation on the microstructure and hardness of A356 aged alloy were studied. The results show that the addition of this element generates the formation of Ni31Si12 and NiFe phases with high thermal stability. In addition, the presence of Ni into the Al matrix and precipitates of the second phase affect the precipitation kinetics, transformation sequence, growth rate, and slow loss of hardness in the system after reaching the maximum values. For example, the Ni additions contribute to generating the coexistence of b" precipitate and GP-I zones. Of all the strengthening mechanisms present, hardening by precipitation is the most influential in the hardnes

Effect of Hot Isostatic Pressing and Rare-Earth Elements Addition on the Microstructure and Hardness on Inconel 718

Inconel 718 superalloy is highly employed in high-temperature applications; its principal properties are high resistance to oxidation and excellent mechanical performance. Such alloys are generally used in aeronautics and aerospace engines, power generation, and the chemical industry. Recent studies on the influence of rare-earth elements as rhenium, hafnium, tantalum, niobium, and ruthenium have enlarged to develop superalloys with higher microstructural properties and mechanical performance. Also, significant effects on microstructural and mechanical properties because of cerium and yttrium additions have been reported due to an increase in the lattice mismatch and the grain boundaries, furthermore, promotes modifications in carbides and eutectic phases