Miller indices of Ni based alloys

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SUMMARY

The Miller indices for Inconel 600 and Inconel 690 alloys, both of which exhibit a face-centered cubic (FCC) structure, are essential for understanding their crystallographic properties. Inconel 600 contains approximately 70% nickel, while Inconel 690 consists of about 58% nickel, with significant chromium content in both alloys. These indices are crucial for analyzing the phases in these complex austenitic solid-solution alloys, particularly in the context of x-ray diffraction studies aimed at determining lattice parameters after exposure to supercritical water environments.

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  • Understanding of Miller indices and crystallography
  • Familiarity with face-centered cubic (FCC) structures
  • Knowledge of Inconel alloys, specifically Inconel 600 and 690
  • Experience with x-ray diffraction techniques
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  • Research the specific Miller indices for Inconel 600 and 690 alloys
  • Study the effects of supercritical water environments on austenitic alloys
  • Learn about lattice parameter calculations in FCC structures
  • Explore the role of chromium carbides in Inconel alloys
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Materials scientists, metallurgists, and engineers involved in the study and application of nickel-based alloys, particularly those working with Inconel 600 and 690 in high-temperature and corrosive environments.

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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?
 
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nukapprentice said:
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?
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/products/inconelalloy600.php
http://www.specialmetals.com/products/inconelalloy690.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.
 
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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.
 

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