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.