Question

Which is the easiest to plastically deform: bcc, hcp, fcc?

Answer 1

Answer:

FCC are the easiest form to plastically deform.

Please learn a few definitions Slip plane – is the plane of greatest atomic density. Slip direction – is the close-packed direction WITHIN the slip plane Slip system = slip plane and slip direction TOGETHER

THEN; 5 independent slip systems are necessary to make a polycrystalline material ductile.

HCP - Has three slip systems (one plane and three directions, giving 3x1= 3 slip systems, we know that minimum 5 independent slip systems are necessary to make a polycrystalline material ductile.therefore HCP is brittle.

FCC - has 12 slip systems (three {111} family of planes and four <110> family of directions, giving 3x4 =12 slip systems, which is more than 5 independent slip systems therefore FCC is ductile.

BCC -has 48 slip systems and expecting better ductile but it is brittle (six {110} family of planes and two <111> family of directions =6x2 = 12 slip systems + six {211} family of planes and two <111> family of directions =6x2 = 12 slip systems + six {321} family of planes and four <111> family of directions =6x4 = 24 slip systems; grand total 12+12+24 = 48 slip systems)

BCC lattice structure has too much of slip systems(48), here slip systems are INTERFERE OR MUTUALLY OBSTRUCT each other therefore slip movement in BCC is made very difficult thus BCC is brittle.

Explanation:

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