Effect of Annealing Temperature on Microstructure and Properties of a High-entropy Alloy Fe35Ni30Cr20Al10Nb5
The effect of annealing-temperature on the microstructure and properties of the low-melt-ing point high-entropy alloy Fe35Ni30Cr20Al10Nb5(molar ratio)were systematically investigated.The results show that with the increasing annealing-temperature,the volume fraction of Fe-Cr-rich fcc phase gradual-ly decreases,while the volume fraction of Laves phase and B2-NiAl phase gradually increases for the as-cast alloy.The quasi-static compression test results show that the as-cast alloy has good compressive plastic deformation ability,and the yield strength of the alloy increases and then decreases as the anneal-ing-temperature increases.The decrease in compression yield strength with the rising annealing-tempera-ture is mainly attributed to the decomposition of the fcc phase at higher temperatures.The electrochemi-cal test results show that the corrosion resistance of the alloy increases monotonically with the annealing-temperature,and the free-corrosion potential of the alloy annealed at 900℃ is-72.02 mV.
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