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3 rd Sesions Metallugi Fisik 08-10-2012 Crystall Structure 26/11/2012 [email protected] 1
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Metalurgi Fisik Sesion 3rd Crystalline Structure 00

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Page 1: Metalurgi Fisik Sesion 3rd Crystalline Structure 00

3rd Sesions Metallugi Fisik 08-10-2012

Crystall Structure

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ANALISIS SEL SATUAN

Sel satuan (unit cell)

susunan atom yang terkecil di dalam ruang dan berulang secara periodik

Logam

kubus, heksagonal, dan tetragonal

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STRUKTUR KRISTAL

Karakteristik penting dalam struktur kristal:

1. Bilangan koordinasi

Jumlah atom terdekat yang mengelilingi atom lainnya

2. Atomic Packing Factor (APF)

Sel satuan struktur kristal

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STRUKTUR KRISTAL

Karakteristik penting dalam struktur kristal:

3. Bidang Slip (slip plane)

Bidang yang memiliki jumlah atom yang lebih banyak atau bidang yang yang memiliki susunan atom paling rapat

Fungsi bidang slip tempat bergeser/berpindahnya atom-atom

Dasar “ teori pembentukan logam”

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A Unit Cell

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Jenis Sel Satuan

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Jenis Sel Satuan

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(c) 2003 Brooks/Cole Publishing / Thomson Learning™

The fourteen

types of Bravais

lattices grouped

in seven crystal

systems.

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(c) 2003 Brooks/Cole Publishing / Thomson Learning™

Definition of the

lattice parameters

and their use in

cubic,

orthorhombic, and

hexagonal crystal

systems.

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Sel Satuan Pada Logam

a. Kubus pusat badan (body center cubic = bcc)

b. Kubus pusat muka (face center cubic = fcc)

c. Heksagonal susunan rapat (close packed hexagonal= cph)

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A. Kubus sederhana (simple cubic /sc)

B. Kubus pusat badan (body center cubic /bcc)

C. Kubus pusat muka (face center cubic / fcc)

KUBUS

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(a) Illustration

showing sharing of

face and corner

atoms. (b) The

models for simple

cubic (SC), body

centered cubic

(BCC), and face-

centered cubic

(FCC) unit cells,

assuming only one

atom per lattice

point.

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Illustration of coordinations in (a) SC and (b) BCC unit cells. Six atoms touch

each atom in SC, while the eight atoms touch each atom in the BCC unit cell.

Bilangan Koordinasi

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