Transactions of Nanjing University of Aeronautics & Astronautics
Microstructure and Property of Al-FeCoNiCrAl High Entropy Alloy Composite Coating on Ti-6Al-4V During Annealing Using MA Method
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Abstract:
Al-FeCoNiCrAl high entropy alloy (HEA) composite coatings were prepared on Ti-6Al-4V via high-energy mechanical alloying (MA). The microstructures and phase composition of the coatings were studied. A continuous and dense coating could be fabricated at a ratio of 35% (weight fraction) Al-FeCoNiCrAl after 4 h milling. The results showed that the thickness of the composite coatings increased first and then decreased with the increase of milling time. And the hardness of coating increased with the increase of milling time. The phase changed during the annealing process. Part of the initial body-centered cubic (BCC) phase of the composite coatings changed into the L12 phase, (Ni, Co)3Al4 and σ phase after annealing above 550 ℃. Ordered BCC was found in the coatings after annealing above 750 ℃. Only BCC and ordered BCC appeared in coatings after annealing above 1 050 ℃. The hardness of the coatings after annealing at 550 ℃ and 750 ℃ was higher than before because of spinodal decomposition and high hardness σ phase. The hardness of the coatings after annealing at 1 050 ℃ decreased because residual stress released.
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TF125
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