Dear Researchers,
I have prepared some alloy samples (NiCuMnSn) by ball milling. The obtained powder was converted into 10mm pellets and then heat treated at 950 degree celcius (under very high vacuum ) for 36 hrs followed by ice-water quenching. The obtained phase is mixture of austenite and martensite phase. It could not convert into single phase (martensite phase).
Why it is so?
I have performed DSC measurement (during heating) of these samples from 30 degree celcius to 550 degree celcius. I found 2 peaks near 350 degree and 380 degree. My questions are-
What does these two peaks indicate?
Is it martensitic transforamtion?
Should I do DSC from 5K to 400k temperature also?
Is it high temperature shape memory alloy?
Dear Dinesh Saini.
If you see bright peaks it has a latent heat of transition. At the first-order phase transition is released latent heat of transition. Most likely the sample is not a single phase. You can see additional peaks at lower temperatures.
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