mtex examples with data

I have been doing a bit of play using mtex to look at some EBSD data which I previous exported to .ctf format. mtex is an open source (GPL) software, which written for the commercial matlab software. The mtex package comes along with several examples and tutorials which can be read within matlab or over the http-internet-web.

Example scripts for using mtex are also available to download from the recently published paper “On Three-Dimensional Misorientation Spaces” by Krakow etal. published in Proceedings of the Royal Society A, 473, 2017.

Scripts and EBSD data for the case studies in the paper are available here:

https://www.repository.cam.ac.uk/handle/1810/263510

Scripts for producing other figures in the paper (explaining orientation relations etc.) are available from the mtex website here (along with other examples):

https://mtex-toolbox.github.io/publications.html

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Top Ranking Journals in Metallurgy (google Journal Impact Factors)

https://bainite.wordpress.com/2015/07/21/metallurgy-journal-impact-factors/

https://scholar.google.co.uk/citations?view_op=top_venues&hl=en&vq=eng_metallurgy

Publication h5-index h5-median
1. Materials Science and Engineering: A 56
2. Metallurgical and Materials Transactions A 38
3. Intermetallics 36
4. Materials Characterization 30
5. Transactions of Nonferrous Metals Society of China 30
6. International Journal of Refractory Metals and Hard Materials 28
7. ISIJ International 28
8. Journal of Materials Engineering and Performance 27
9. Metallurgical and Materials Transactions B 27
10. Materials Science and Technology 24
11. Journal of Thermal Spray Technology 24
12. Science and Technology of Welding and Joining 23
13. Archives of Metallurgy and Materials 20
14. Journal of Iron and Steel Research, International 19
15. Steel Research International 19
16. Metals and Materials International 18
17. Metalurgija 17
18. Oxidation of Metals 16
19. International Journal of Minerals, Metallurgy, and Materials 16
20. Journal of Materials Research and Technology 15

Royal Societies Inspiring Scientists

The Royal Society put together some student resources on Inspiring British scientists with minority ethnic heritage. My Supervisor Harry Bhadeshia is twice as inspiring as the rest, as you can see from the Royal Societies Tweet:

Royal Soc Inspiring Scientists

Link to resources

Fabrication of Magnesium diboride superconductor

Bhadesha123 has posted a nice video on youtube discussing the fabrication of Magnesium diboride superconductors.

This seems an interesting metallurgical case study about developing a processing route. Advantages of swagging and drawing are discussed as well as the importance of preventing grain growth to allow processing and for control of material properties.

The video was provided by Professor Bartek Glowaki of the University of Cambridge, who filmed, directed and edited the videos.

Forming carbon from iron

During deformation of austempered ductile iron the carbon can be squeezed out of the material. This carbon is present as nodules of graphite, what is probably happening is that the carbon nodules migrate to the surface, allowing the volume to be reduced in response to the loading.

Another possibility is that carbon is dissolved into the iron and then nucleates and grows sheets on the surface. That seems less likely.

At high temperatures the mostly likely thing to happen would be that carbon on the surface would oxides and form CO gas and be liberated.

Dyanamic test austempered ductile iron

Drs Dawid Myszka, A. Wieczorek and Tadeusz Cybula from the Warsaw University of Technology, Poland investigated the influence of microstructure on the dynamic mechanical properties of austempered ductile iron using Taylor impact testing. Austempered dictile iron means it’s a cast iron, so has graphite particles in a matrix heat treated to become bainite!. Taylor impact testing means you fire cylinders of the material at an immovable object and see how the material gets squished.

Deforming Austempered Ductile Iron

Shattering Austempered Ductile Iron

The heavily deformed volume which faced the impact has resulted in hardening and in transformation to martensite — both hardness and magnetic measurements have been used. Hardening was due to mostly strain induced austenite-to-martensite transformation, and also due to cold-work.

References
D. Myszka, L. Cybula and A. Wievzorek
Influence of heat treatment conditions on microstructure and mechanical properties of austempered ductile iron after dynamic deformation test
Archives of Metallurgy and Materials
V59, Issue 3, 2014

DOI:10.2478/amm-2014-0204

Which is better, iron or gold?

To Croesus, King of Lydia, on being shown his golden treasures, Solon said: “If another comes who hath better iron than you, he will take away your gold.”

Croesus on the pyre*

*image shown depicts King Croesus, unlikely to show Solon.

King Croesus introduces gold coinage (adopted by the Persians after they defeated him) although his coins used a gold-silver alloy (electrum) based on the composition of the alluvial deposits. When he asked the Delphic oracle of Amphiarus if he should wage a campaign against Cyrus the Great of Persia or seek an alliance, the Delphic advice was that if Croesus attacked the Persians, he would destroy a great empire.

Sources

Herodotus, The History of Herodotus, Translated by George Rawlinson

http://classics.mit.edu/Herodotus/history.mb.txt

http://www.thelatinlibrary.com/historians/herod/herodotus2.html

http://www.bartleby.com/344/370.html