Stacking Faults

Stacking faults

[@epiczaino7416]

i m a mechanical engineer,i found this channel very useful,more everything is well explained and clear

[@sangamsangu7470]

We on our end for o

[@liisemuduru]

if you activate editing the translation, I will translate it to Turkish and I want to help all the material engineer students in Turkey . Thank you.

[@suwarnaca9595]

kindly like this so he takes notice

[@tahsin28]

Learn English :)

[@liisemuduru]

@@tahsin28 thank you

[@pragalbhvashishtha7711]

Now it is not possible to get community translations. Google has gotten rid of the feature

[@phoenix8234]

Sen se okuyorsun? Bölümün ne ? Ben metalurjisi ve malzeme mühendisliği okuyorum Turkye'de.

[@navanitvikram8635]

1) I think if it's a lattice translation then there would be no change in sequence (i.e. it continues to be ABCABC after lattice translation that is what the definition says)

[@syedrizvi1927]

Crystallography is important chapter of mineralogy in geology. As a geologist I found this course very helpful and satisfactory

[@bestcakesdesign]

How can u explain?

[@srisrithar7466]

Crystal Clear explanation .thank u sir

[@Shreejigovindhari]

In lattice translation, if we shift a vector from one point to another, we get the exact same lattice but here due to stacking fault of ABCABC type, we also get a HCP type structure (i.e. ABAB), hence if we translate a vector, we won't get the exact same lattice, that is why non-lattice translation term has been used. Please correct me if I am wrong sir ! 🙂

[@introductiontomaterialsscience]

You are right. Wish you the best.

[@Shreejigovindhari]

@@introductiontomaterialsscience thank you sir for creating my interest in that subject which I never liked. ❤️❤️ God bless

[@letslearnmechanicalengineering]

Is stacking fault takes place in close packed structure only

[@namanjain4870]

@@letslearnmechanicalengineering No, stacking fault can happen in a BCC crystal too. I googled and found - A stacking fault is just an interruption of the regular stacking sequence of a crystal. If there were stacking fault in BCC, you would see atom layer right above or below another layer rather than in the valley positions. Such arrangement costs a lot of energy to form and is thus very unstable and rare. But yes, there are occasional experimental observation on this.

[@rakeshjoshi9301]

@@introductiontomaterialsscience in

[@deadman8249]

@Introduction to Materials Science and Engineering Since, ccp is having fcc lattice. In the given example c plane was missing. Then take a corner as A. And 2 triangular plane (111) as B next to A, and then C (111) next to B. If C plane is missing, then every atom of C plane lies in [110], [101] ,[011],[1 1/2 1/2], [1/2 1 1/2] and [1/2 1/2 1] , _when we take (A before B) as origin_ . Then the question is about the *translation vector* . It means in which direction I should shift my A plane to get superimpose of A at C. Also you can say that, in which direction I should move the atoms of A planes to get the same atom at C. *Then the answer would be .* That's what I think, but I need your reply to confirm my answer.

[@pawanrana7920]

Very good and satisfying explaination.

[@user-xv9yi9ti7v]

Thank you soooo much!!

[@changfengwan8140]

Sir, Whats the difference between stacking fault and anti-phase boundary.

[@prakharbhalla9461]

Sir is Miller indices of translation for stacking fault [1 2bar 1]

[@lolohardi6670]

Thank you 🙏

[@avusulagnaneshwar948]

1) Because it is not a perfect lattice translation.that is B lattice position Another B lattice position is perfect translation. Here it is going from B to C position then C to B forming stacking fault.

[@pranav9339]

1. If it were a lattice translation, it would give the same sequence again (ABCABC), but here after translation, the sequence is changed. So it is not a lattice translation.

[@nachiketbelwalkar1072]

is the answer for 2nd is (2/3)[111]?

[@user-lo6fg9ym7r]

wonderful lectures

[@vikashkumarvlogsnitj]

you are very great teacher sir ! can you please take a lecture in MNIT jaipur

[@gyanananda4738]

sir answer of second is [111] because 111 direction is perpendicular to 111 plane where abcabc stacking sequence are present because it changes from b to c across the fault whole lattice will change so it cant be a lattice translation .plese sir respond if i am correct or not.

[@ShuvamNayak]

1) In the ABCABC stacking, each atom is a lattice point, thereby giving us the FCC lattice, but due to stacking fault, as soon as the stacking changes to ABABAB the crystal changes to HCP where the atom at B layer is not the part of the lattice, therefore, the translation associated to stacking fault cannot be lattice translation. 2) All the layers are part of the family of planes {111}, thereby the translational vector of stacking fault is in

[@suwarnaca9595]

if its 111 won't it be translational? I mean lattice translation

[@nachiketbelwalkar1072]

@@suwarnaca9595 it will be (2/3)[111].....(two third of [111])

[@shubhamvairagade1]

@@nachiketbelwalkar1072 how?

[@bijoybasumatary4651]

Make more of such vedios

[@rajkanpurwala2828]

sir, will stacking fault affects the packing efficiency of a material?

[@introductiontomaterialsscience]

Ideally, it should not. In close-packing of sphere model any stacking sequence of close-packed planes give the same packing efficiency of 0.74.

[@AbhijeetKumar-fk8lb]

1. A, B and C are not a lattice point of same FCC crystal Hence stacking fault cannot be a lattice translation. 2. 1/6 [211]

[@Vickysahu0092]

May be because If translation is to be a lattice translation then it will form a dislocation line (1D defect) only. But when non lattice translation is there it forms stacking fault along with a dislocation line. Is it correct sir?

[@rajeshprasadlectures]

If it is a lattice translation, no defect is is created. You get exactly the same crystal.

[@Vickysahu0092]

In one of your previous lectures you said stacking faults are due to fractional lattice translations and burger's vector to be shortest lattice translation. And a partial shift caused stacking fault along with a dislocation. Can we say fractional lattice translation same as non-lattice translation?

[@introductiontomaterialsscience]

@@Vickysahu0092 Yes.

[@Vickysahu0092]

@@introductiontomaterialsscience Thank you sir

[@prithivirajan1]

Prof. Prasad: First of all thank you for such amazing lectures, I learnt a lot and I really appreciate it. I have the following question, could you please help me out : I have a hard time understanding the connection between a partial dislocation and stacking fault. I am able to visualize the stacking fault via the translation of atoms(from C to A), but how can I imagine the motion of a dislocation line in the creation of a stacking fault ?

[@introductiontomaterialsscience]

I have not gone into the details of partial dislocations and their relation to stacking faults in this course. But I intend to take this up in another channel kzbin.info/door/kPseC3C88WISj6fvrqGxXw But currently here also I have not yet discussed the partial dislocations.

[@prithivirajan1]

Thank you Prof. Prasad, I am looking forward to listen to your lectures on partial dislocations.

[@ajayjoshi9256]

1) the the abc abc crystal structure is a fcc structure where the a resembles corner atom b and c plane resembles the (111)plane , hence the lattice translation vector for the same should be [111], and sir as the translation is along the body diagonal where there is no lattice point present hence it must be a non lattice translation sir please do respond , if my answers are correct or not??

[@rajeshprasad101]

The translation associated with the stacking fault lies in the fault plane, here (111) plane and not perpendicular to it. Thus the fault translation is not [111] which is perpendicular to (111). The translation vector of the fault will take position A to B in ABCABC sequence. This translation can be shown to be 1/6[11-2], or other equivalent vectors, which is not a lattice translation.

[@navanitvikram8635]

@@rajeshprasad101 Can I know how translation vector comes to be 1/6 [11 -2] ? I thought it would be [110] sir.

[@sabitakumari3482]

@@rajeshprasad101 sir can you please explain it

[@sabitakumari3482]

@@rajeshprasad101 explain sir

[@harikrishnan3112]

@@rajeshprasad101 Yes sir. Why can't it be [110] the diagonal line on the top face.

[@surajhansdah4207]

sir can you explain me what is non lattice translation.

[@introductiontomaterialsscience]

If you draw a vector starting from a lattice point but ending at an arbitrary point (i.e, not a lattice point) then it is a non-lattice translation. So if you draw a vector from a corner to a centre of a face in a BCC lattice it will be a non-lattice translation.

[@harikrishnan3112]

is the miller indices [110]

[@aadithyasathyanarayanan9397]

I think its [111]

[@mrKumar-mo5ch]

Can u please explain?

[@nachiketbelwalkar1072]

it cant be lattice translation or else it cant be stacking fault

[@nachiketbelwalkar1072]

i think answer is (2/3)[111]

[@vikaskumar43]

non lattice translation vector=(-211)/6

[@sexychantu5066]

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