miller indices of Ni based alloys

nukapprentice

I was wondering if anyone could give me some info on what the miller indices of Inconel 600 and 690 alloys are. I know they are FCC structure, but does that automatically give them the conventional numbers, or is it something else since it is a complex alloy?

Astronuc

The Miller indices would apply to each phase in a rather complex system, but in these austenitic solid-solution alloys, it would be dominated by Ni. Cr generally forms Cr carbides.

http://www.specialmetals.com/product...elalloy600.php
http://www.specialmetals.com/product...elalloy690.php

Inconel 600 is nominally 70% Ni (with 14.0-17.0% Cr and 6.0-10.0% Fe), while Inconel 690 is nominally 58% Ni (with 27.0-31.0% Cr and 7.0-11.0% Fe). There are small amounts of C, Si and traces of Mn and Cu. They do not have Mo, Nb, Al or Ti, which are found in other Inconels.

nukapprentice

Thanks Astronuc! That's really great stuff. I guess the reason why I'm asking is because my friend is conducting x-ray diffraction studies on IN 600/690 for samples before and after being exposed to a supercritical water environment. I was hoping to get the miller indices in order to solve for the lattice parameter a.