Twin boundary

[@421-18c]

Nice video Sir keep it up

[@alcryton6515]

Sir I am from Nasik passed out from diploma and now I am taking . Admissions are process is going on. But still their is lots of time remaining. Sir I am telling this because we are completely dependent on self study and their is no perfect guide that we are getting. But your video is really helping me a lot to understand concepts.

[@abdulkadeer6689]

sir,good explanation

[@subaannanthak5005]

Super sir. Pls upload more video like this.👌👌👌👌

[@aswathikoorikkat6361]

Can you classify the defects based on whether they are formed during nucleation or during growth?

[@introductiontomaterialsscience]

This is a difficult question. I am not aware of any such classification.

[@aswathikoorikkat6361]

@@introductiontomaterialsscience Let me rephrase the question. Are these defects already present within the early formed nucleii? I noticed that you answered one of the questions by suggesting that the pair of twins might have formed already during their nucleation.

[@Emad8452]

Very nice explanation, thanks

[@hoor7861]

why are twin boundaries produced from mechanical shear force in BCC and HCP, but in FCC they're produced from annealing heat treatment??

[@rajeshprasad101]

Thanks for asking. This is a difficult question. I have no answer.

[@harikrishnan3112]

Hi sir. Twin boundry is the result of tilt angle of 180°, then why can't we include in Grain boundry. Does large angle boundary in tilt angle has any limitations??

[@introductiontomaterialsscience]

Hi Hari. Twin boundary is indeed a grain boundary. It is a grain boundary with special orientation relationship of grains across the boundary. The two grains across a twin boundary are mirror images of each other. But the same two grains can also be related to each other by a rotation.

[@harikrishnan3112]

@@introductiontomaterialsscience Thank you sir. Now I could visualise it.

[@ravithakur0041]

Sir, why twins and twin boundaries appear in some specific materials ? Why not these appear in all materials ? For instance- I have observed twins in Cu-9Al and Cu-4Al alloys but not in pure Cu. Why ? Even I observed twins in Ti-6Al-4V. Something which I found that Al is playing a role in forming the twins. Isn't it ?

[@rajeshprasadlectures]

Not an easy question to answer. It is not clear why you do not see twins in your Cu. This is well reported I have myself seen annealing twins in Cu samples. So the conclusion that Al has something to do with twinning is not justified.

[@ravithakur0041]

@@rajeshprasadlectures Thanks for your reply sir. I have sent you detailed question in the mail. Please check.

[@avusulagnaneshwar948]

why twin boundary occur as pair???

[@yongchaojia4610]

very clear! Thanks!!!

[@surajshinde587]

Nice

[@syedumairalishah1948]

Sir live long ❤️

[@sanahurain605]

Nice lectures Sir

[@ijasbabu9568]

Sir is this twinning

[@introductiontomaterialsscience]

Twinning is the process of the creation of new twins in a matrix. Once created, the boundary between the twin and the matrix is called the twin boundary.

[@ijasbabu9568]

@@introductiontomaterialsscience Thank you

[@metallurgist8326]

Sir, how twin grains are forming and what advantages or disadvantage we will have. Please, tell where and how we can see twin boundry/grain?

[@sexychantu5066]

TWIN BOUNDARY PR PHD HI KARWADIA AAPNE TO LOVE FROM IIT ROORKEE THANKS AND REGARDS SEXY CHANTU

[@Sumit2797kala]

Why twinning happens

[@introductiontomaterialsscience]

A difficult question. One can think of twinning as a plastic deformation mechanism competing with slip mechnaism. In cases where twinning requires lower stress than slip, twinning takes place. But I am aware that this is not a very satisfactory answer.

[@Sumit2797kala]

@@introductiontomaterialsscience twinning happens in pairs usually, I heard. logic behind that might help understand twinning occurrence better..

[@shivshankargor]

Pls remove text of speech in video, your language is quite understandable, these texts hide the content what you have written fairly.

[@introductiontomaterialsscience]

Please use the cc button in bottom bar of the video.

[@sonam8347]

Sir plz start with twinning topic n types... Bcz we hv not got any lecture on crystallography in our college. Plz help sir

[@introductiontomaterialsscience]

What are you studying? At what level do you want twinning to be discussed?

[@XJoyBoyX]

KING

[@seshadriharish6687]

Why IN MIRROR IMAGE A IS EXTRA

[@rajeshprasad101]

In twinning the mirror plane can be either a plane with atoms or without. In the example discussed the atomic plane A is acting like a mirror plane.