I prepared FeCoNiAlMn and FeCoNiAlMn1-xCrx (x=0.2,0.4,0.6, 0.8,1) using Ball mill with 45hrs milling but for increasing the crystallinity of my powder alloy samples I need to heat them in vacuum condition. What should be the heating temperature and for how much time?
800°C for one hour is more than enough for all your amorphous phases to become crystalline. At 1000°C, within a few minutes, active interdiffusion of all phases and alignment of the composition will take place. In an hour at 1000 degrees, the size of the crystals will grow to several tens of micrometers.
I have some apprehension that Aluminum might be evaporated in Vaccum under this high temperature(850 C for 2 hrs)
In opinion of another expert after ball milling this might not happened
Pls guide me.
Dear Danial,
you don't have to worry about the evaporation of aluminum. NiCoCrAlY alloys (up to 15% aluminum) are held in vacuum at 1100 degrees and aluminum of them not evaporate. FeCrAl alloys (Kanthal APM, about 6% Al) work for a long time in vacuum at 1200°C and higher (in air up to 1350-1400 degrees), and aluminum also does not evaporate from them. And in general, why on earth should aluminum evaporate at 850 degrees, when its boiling point is 2470°C?
Chaudhary, Varun, Richa Chaudhary, Rajarshi Banerjee, and R. V. Ramanujan. "Accelerated and conventional development of magnetic high entropy alloys." Materials Today (2021).
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