Differentiate between mechanical/deformation and annealed twins from EBSD data?

[MTEXNewbie]

I was wondering how can we differentiate between deformation and annealed twins by using MTEX?

Thank you.

[Rüdiger Kilian]

Hi,
if you have some criterion that determines the difference between them, you can probably do it.
Cheers,
Rüdiger
________________________________________
From: mtex...@googlegroups.com <mtex...@googlegroups.com> on behalf of MTEXNewbie <rashed...@gmail.com>
Sent: Sunday, July 7, 2019 2:39:38 PM
To: MTEX
Subject: {MTEX} Differentiate between mechanical/deformation and annealed twins from EBSD data?

I was wondering how can we differentiate between deformation and annealed twins by using MTEX?

Thank you.

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[MTEXNewbie]

Hi Rüdiger,

Generally, the main difference is that the deformation twins are lens-shaped due to the constraints but annealing twins are straight [1]. DTs are thinner and does not go all the way across the grain, so either sides of DT will have the same crystal orientation. On the other hand, annealing twins will have different orientation on either side. Is there a way to detect the orientation variation around a grain (+/- 2° misorientation)?

[1] https://www.researchgate.net/post/What_is_the_difference_between_deformation_twins_and_annealing_twins

[ruediger Kilian]

Hi,
so obviously you could try to compute the curvature (or segment length between triple points vs distance between the corresponding triple points) of suspect twin boundaries, check whether a twin will be surrounded by a grains with one grain id etc.
Not sure what you mean with "detect the orientation variation around a grain (+/- 2° misorientation)".

Hope that helps.

Cheers,
Rüdiger

[MTEXNewbie]

> Not sure what you mean with "detect the orientation variation around a grain (+/- 2° misorientation)". 

Since the DTs would exist inside a grain, maybe if a grain is surrounded by nearly same misorientation  (+/- 2°) around it we can tell it is inside the grain.

However, your suggestion of checking whether a twin will be surrounded by a grains with one grain id seems more practical. Is there a code snippet/example that demonstrate it?

[Sarvesh Swamy]

Apart from shape of the twin. You can differentiate using angle axis pair.

For example an annealing twin like sigma 3 twin it has disorientation of 60 degree about <111> direction

If its deformation twin can also be differentiated by angle axis pair, for example in Zn a disorientation of 82 degree about <11-20> direction corresponds to contraction twin.

If other system like Ti other types of twin also get activated which you can refer in literate for angle axis pair.

regards

sarvesh

On Sun, 7 Jul 2019 at 18:09, MTEXNewbie <rashed...@gmail.com> wrote:

I was wondering how can we differentiate between deformation and annealed twins by using MTEX?

Thank you.

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