# GATE MT 2020 Q21. A slip system consists of a slip plane and a slip direction. Which one of the following is NOT a valid slip system in a FCC copper crystal?

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Askmemetallurgy Official

Asked: 2020-05-09T19:17:02+05:30
2020-05-09T19:17:02+05:30In: Physical Metallurgy & Heat treatment

6.45%A ( 2 voters )
77.42%B ( 24 voters )
12.9%C ( 4 voters )
3.23%D ( 1 voter )

Based On 31 Votes

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This answer was edited.It can easily be found by simple plane and direction condition. Since the slip direction must lie in the slip plane so if (hkl)- slip plane and [uvw]- slip direction then by direction will lie in plane if hu+kv+lw=0 . So by que, B option is the only system which didn't satisfy this. That means it doRead more

It can easily be found by simple plane and direction condition.

Since the slip direction must lie in the slip plane so if (hkl)- slip plane and [uvw]- slip direction then by direction will lie in plane if

hu+kv+lw=0.So by que,

B option is the only system which didn’t satisfy this. That means it doesn’t lie in slip plane and hance not a slip system.

See lessThis answer was edited.Correct answer is option B. @Rohit.km described it best. Thank you. Some peripheral lines related to this topic: (hkl) [uvw] are said to be slip system hu + kv + lw = 0

Correct answer is option B. Rohit jha.km described it best. Thank you.

Some peripheral lines related to this topic:hu + kv + lw = 0

B

B

See lessFor a valid slip system there is a condition given below; slip direction * slip plane = 0 so 1*0+1*1+1**1 = 2 which is not equal to zero hence B is correct

For a valid slip system there is a condition given below;

slip direction * slip plane = 0

so 1*0+1*1+1**1 = 2 which is not equal to zero

See lesshence B is correct