#Nickel density pdf

Then, to the sluggishness of formation of a true equilibrium, add the ordering that takes place because of the Curie temperature. The lack of any data below 500 C suggests that answers below this temperature can't be found within the period of a budgetary calendar year or residence time of a grad student thesis, whichever is greater. That phase diagram also suggests that there is a gamma prime at the nickel rich side, looks like maybe a peritectic (forgive inaccuracies in terminology, it's been a LONG time) at 500 C and 77 w/o Ni. Perhaps using 'Fe-Ni binary' would be better. (!)Īlso, Richard's statement of 'austenitic steels' naturally limits the data to less than 50% Ni, beyond which value the material is not technically a steel any more. There is a lot of research on Fe-Ni due to its being present in meteoric rocks and I recall statements being made about how the Fe-Ni system is particularly sluggish in diffusion, such that true equilibrium in some parts is unlikely to be reached within the current age of the universe. At equilibrium below 50 w/o Ni there should be some alpha present if I use the lever rule. The way I interpret it (not a guarantee of accuracy!) is that the field is ferritic-austenitic-mixed and not going to be fully austentic at equilibrium at room temperature, probably, though the curves start being dashed below 500 degrees C and about 8% Ni, the limit shown for the fully alpha field. I found an old reference, footnoted, showing the Fe-Ni binary system. You point out some aspects of the original question, related to Austenitic steel. He obviously came to the right place! Some comments: That is interesting data I didn't even think that Richard would get an answer. I am hoping to find something a little more definitive than this, but I have had no luck finding any such paper. I suspect some of the cards were not measured at STP, confused mass% with mole%, or contained other unspecified elements in more than trace amounts.

#Nickel density pdf

I made a plot (below) of data taken from x-ray diffraction PDF cards from the 04-XXX-XXXX subfile, about 28 cards total of Fe-Ni alloys of point group 225 at STP, and the scatter is huge regardless of a linear or nonlinear best-fit curve. Further complicating the question is that austenite with very low is unstable below the transition temperature curve, while the data I need must be at atmospheric temperature and pressure.

The increasing mass is probably linear with nickel content, while the increasing volume is probably not linear w/. As nickel replaces iron in austenite, the FCC unit cell gets heavier but also gets more spacious. Nickel atoms are slightly heavier and larger than iron.

The question seems at a glance like it should be trivial, but it is not that simple. I am working on a paper where I need to know the density of austenitic steel at standard temperature and pressure (STP) as a function of nickel content. Does anyone know of a paper that demonstrates a plot or mathematical model of the density of austenitic steel as a function of nickel content at STP?