Microstructure, Mechanical, and Tribological Relationship in Cu-12Al-Ni Alloy with Respect to the Variation of Ni Content.

Autor: Dalai, Renu Prava, Mohapatra, Sushree P., Nayak, Debasis, Mishra, Dinesh K., Behera, Ajit
Předmět:
Zdroj: Journal of Materials Engineering & Performance; Aug2024, Vol. 33 Issue 16, p8554-8566, 13p
Abstrakt: Powder metallurgy is an effective method to produce Cu-Al-based alloys for automotive and aerospace engineering components. The finer grain size, low cost, and low-temperature synthesis make this process more suitable than the other conventional production method such as melting and casting. The addition of Ni (austenite stabilizer) into the Cu increases the stability of Cu and refines the grain size. Again, the addition of Ni into the Cu-Al alloy increases the strength and hardness. In the present work, Cu-12Al alloys are developed by varying the wt.% of Ni content from 0 to 8 using powder metallurgy process through mechanical alloying method. Mechanical alloyed powder mixture is compacted by applying a load of 5 tons and sintered at 850 °C for 1 h under nitrogen atmosphere. It is found that α-Cu, γ2-Cu9Al4, and NiAl phases are presented in the Cu-12Al-Ni alloy which influences the properties of the alloy. The theoretical, sintered, and relative density values are decreased with increasing the wt.% of Ni content. However, the Vickers hardness of the alloy is improved by increasing the wt.% of Ni content up to 4 wt.% and then reduced for 8 wt.% of Ni content due to the coarsening and network-type structure of the NiAl phase. A higher amount of wear loss or wear rate is observed for the Cu-12Al and Cu-12Al-2Ni alloy than the Cu-12Al-4Ni and Cu-12Al-8Ni alloy. The presence of oxygen peaks in the EDS analysis revealed that an oxidative type of wear is occurred for the Cu-12Al alloy samples with varying the wt.% of Ni content. The electrochemical corrosion analysis revealed that the rate of corrosion is higher for Cu-12Al alloy without Ni. However, the rate of corrosion is reduced by increasing the wt.% of Ni content from 2 to 8. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index