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ARPGE: a computer program to automatically reconstruct the parent grains from electron backscatter diffraction data.

Cayron C - J Appl Crystallogr (2007)

Bottom Line: A computer program called ARPGE written in Python uses the theoretical results generated by the computer program GenOVa to automatically reconstruct the parent grains from electron backscatter diffraction data obtained on phase transition materials with or without residual parent phase.The misorientations between daughter grains are identified with operators, the daughter grains are identified with indexed variants, the orientations of the parent grains are determined, and some statistics on the variants and operators are established.Variant selection phenomena were revealed.

View Article: PubMed Central - HTML - PubMed

Affiliation: CEA-Grenoble, DRT/LITEN, 17 rue des Martyrs, 38054 Grenoble, France.

ABSTRACT
A computer program called ARPGE written in Python uses the theoretical results generated by the computer program GenOVa to automatically reconstruct the parent grains from electron backscatter diffraction data obtained on phase transition materials with or without residual parent phase. The misorientations between daughter grains are identified with operators, the daughter grains are identified with indexed variants, the orientations of the parent grains are determined, and some statistics on the variants and operators are established. Some examples with martensitic transformations in iron and titanium alloys were treated. Variant selection phenomena were revealed.

No MeSH data available.


Related in: MedlinePlus

Powder metallurgy Ti-6Al-4V titanium alloy. (a) EBSD orientation map of the α grains. (b) Reconstructed parent β grains. (c) Pole figures of grain 4 with the projection of the 〈101〉α and 〈001〉α directions. (d) Statistical bar charts on the variant and operator indices.
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fig6: Powder metallurgy Ti-6Al-4V titanium alloy. (a) EBSD orientation map of the α grains. (b) Reconstructed parent β grains. (c) Pole figures of grain 4 with the projection of the 〈101〉α and 〈001〉α directions. (d) Statistical bar charts on the variant and operator indices.

Mentions: The last example is a Ti-6Al-4V titanium alloy elaborated by powder metallurgy and studied for the future engine Vinci of the Ariane 5 rocket. The EBSD orientation map of the α grains is given in Fig. 6 ▶(a), and the reconstructed parent β grains are presented in Fig. 6 ▶(b). Despite the presence of small highly deformed and dis­oriented α grains, the reconstruction seems to be correct. For example, one may check on the pole figure (Fig. 6 ▶ c) of the largest reconstructed grain that, here again, the calculated 〈110〉β directions coincide with the experimental 〈001〉α directions, in agreement with the Burgers orientation relationship. The reconstruction lasted 30 min. One may also notice in the statistics presented in Fig. 6 ▶(d) that the operator O1 is the most frequent and that operator O2 is nearly absent. This result is quite surprising. One would have expected to find a high proportion of operator O2 because this operator corresponds to a rotation of 10.5° around the hexagonal c axis, i.e. the misorientation between the two variants that share a common (110)β plane (see Table 4 of Cayron, 2006 ▶). A global understanding including the shape of the variants and the elastic field in the set of variants could probably explain such a feature.


ARPGE: a computer program to automatically reconstruct the parent grains from electron backscatter diffraction data.

Cayron C - J Appl Crystallogr (2007)

Powder metallurgy Ti-6Al-4V titanium alloy. (a) EBSD orientation map of the α grains. (b) Reconstructed parent β grains. (c) Pole figures of grain 4 with the projection of the 〈101〉α and 〈001〉α directions. (d) Statistical bar charts on the variant and operator indices.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2483492&req=5

fig6: Powder metallurgy Ti-6Al-4V titanium alloy. (a) EBSD orientation map of the α grains. (b) Reconstructed parent β grains. (c) Pole figures of grain 4 with the projection of the 〈101〉α and 〈001〉α directions. (d) Statistical bar charts on the variant and operator indices.
Mentions: The last example is a Ti-6Al-4V titanium alloy elaborated by powder metallurgy and studied for the future engine Vinci of the Ariane 5 rocket. The EBSD orientation map of the α grains is given in Fig. 6 ▶(a), and the reconstructed parent β grains are presented in Fig. 6 ▶(b). Despite the presence of small highly deformed and dis­oriented α grains, the reconstruction seems to be correct. For example, one may check on the pole figure (Fig. 6 ▶ c) of the largest reconstructed grain that, here again, the calculated 〈110〉β directions coincide with the experimental 〈001〉α directions, in agreement with the Burgers orientation relationship. The reconstruction lasted 30 min. One may also notice in the statistics presented in Fig. 6 ▶(d) that the operator O1 is the most frequent and that operator O2 is nearly absent. This result is quite surprising. One would have expected to find a high proportion of operator O2 because this operator corresponds to a rotation of 10.5° around the hexagonal c axis, i.e. the misorientation between the two variants that share a common (110)β plane (see Table 4 of Cayron, 2006 ▶). A global understanding including the shape of the variants and the elastic field in the set of variants could probably explain such a feature.

Bottom Line: A computer program called ARPGE written in Python uses the theoretical results generated by the computer program GenOVa to automatically reconstruct the parent grains from electron backscatter diffraction data obtained on phase transition materials with or without residual parent phase.The misorientations between daughter grains are identified with operators, the daughter grains are identified with indexed variants, the orientations of the parent grains are determined, and some statistics on the variants and operators are established.Variant selection phenomena were revealed.

View Article: PubMed Central - HTML - PubMed

Affiliation: CEA-Grenoble, DRT/LITEN, 17 rue des Martyrs, 38054 Grenoble, France.

ABSTRACT
A computer program called ARPGE written in Python uses the theoretical results generated by the computer program GenOVa to automatically reconstruct the parent grains from electron backscatter diffraction data obtained on phase transition materials with or without residual parent phase. The misorientations between daughter grains are identified with operators, the daughter grains are identified with indexed variants, the orientations of the parent grains are determined, and some statistics on the variants and operators are established. Some examples with martensitic transformations in iron and titanium alloys were treated. Variant selection phenomena were revealed.

No MeSH data available.


Related in: MedlinePlus