|Mar3-12, 09:15 AM||#1|
High Temperature Super Alloys
Is anyone interested in starting a discussion on this topic? I use them in designs, but don't understand the metallurgy very well.
In particular, how does adding Al to Ni increase the melting point of Ni? It also improves a number of other desirable characteristics. The peak of the melting temperature curve on the phase diagram is at a 50-50 mixture. (Counting moles, not weight.) The resulting mixture is half aluminum, which we who work with refractory metals call "butter" due to its incredibly low melting point; yet the melting point of this mixture is much higher than pure Ni.
|Mar3-12, 09:39 AM||#2|
TMS Superalloys Archive - http://knowledge.tms.org/superalloys.aspx
See also - http://www.tms.org/meetings/specialt...yshistory.html
The high melting point can be attributed to NiAl, an intermetallic compound.
See the Ni-Al phase diagram here - http://www.ias.ac.in/sadhana/Pdf2003Apr/Pe1064.pdf
The challenge is that there are several different phases that can form during the freezing of a melt, so one possibility is to produce a rapid solidified powder, which then must be hot pressed.
|Mar4-12, 08:05 AM||#3|
Thanks, Joe. Now I have to go do some studying before I can ask further questions.
|gas turbine, refractory metals, super alloy|
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