estruturas metálicas
DESCRIPTION
Estrutura metalica dos materiaisTRANSCRIPT
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Estruturas Metálicas
Conceitos Gerais Cristais Metálicos
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Níveis de organização
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Curto Alcance
(c) 2003 Brooks/Cole Publishing / Thomson Learning™
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Longo Alcance (Cristais)
Monocrital (Si)
Material Policristalino (Aço)
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Resumo
(c) 2003 Brooks/Cole Publishing / Thomson Learning™
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Amorfo x Cristalino
(c) 2003 Brooks/Cole Publishing / Thomson Learning™
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(c) 2003 Brooks/Cole Publishing / Thomson Learning™
Redes de Bravais
14 Redes7 Sistemas
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Características geométricas
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Simetria (grupos de pontos)
C1
C2
C3
C4
C5
C6
C2v
C3v
C4v
C5v
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Crystal system No. of point groups
No. of bravais lattices
No. of space groups
Triclinic 2 1 2
Monoclinic 3 2 13
Orthorhombic 3 4 59
Tetragonal 7 2 68
Rhombohedral(Trigonal)
5 1 25
Hexagonal 7 1 27
Cubic 5 3 36
Total 32 14 230
Grupos (pontos, espaciais)
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Lista de Grupos Espaciais
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Associando átomos a uma rede em estruturas metálicas
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Fator de Empacotamento
Demonstrar exemplo de cálculo
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Direções
(c) 2003 Brooks/Cole Publishing / Thomson Learning™
Notação empregada:Índices de Miller[hkl] e <hkl>
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(c) 2003 Brooks/C
ole Publishing / Thom
son Learning
Figure 3.48 Directions in a cubic unit cell for Problem 3.51
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(c) 2003 Brooks/C
ole Publishing / Thom
son Learning Figure 3.49
Directions in a cubic unit cell for Problem 3.52.
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Densidade Linear Exemplo
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Planos
Exemplos: CCC e CFC
Notação empregada:Índices de Miller(hkl) e {hkl}
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(c) 2003 Brooks/C
ole Publishing / Thom
son Learning
Figure 3.50 Planes in a cubic unit cell for Problem 3.53.
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(c) 2003 Brooks/C
ole Publishing / Thom
son Learning
Figure 3.51 Planes in a cubic unit cell for Problem 3.54.
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Direções (sist. hexagonal)
(c) 2003 Brooks/Cole Publishing / Thomson Learning™
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(c) 2003 Brooks/C
ole Publishing / Thom
son Learning
Figure 3.52 Directions in a hexagonal lattice for Problem 3.55.
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(c) 2003 Brooks/C
ole Publishing / Thom
son Learning
Figure 3.53 Directions in a hexagonal lattice for Problem 3.56.
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Planos (sist. Hexagonal)
(c) 2003 Brooks/Cole Publishing / Thomson Learning™
Exemplos
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(c) 2003 Brooks/C
ole Publishing / Thom
son Learning
Figure 3.54 Planes in a hexagonal lattice for Problem 3.57.
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(c) 2003 Brooks/C
ole Publishing / Thom
son Learning
Figure 3.55 Planes in a hexagonal lattice for Problem 3.58.
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Estrutura hexagonal compacta (HCP)
(c) 2003 Brooks/Cole Publishing / Thomson Learning™
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HCP (empilhamento de planos)
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CFC (empilhamento de planos)
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Interstícios
(c) 2003 Brooks/Cole Publishing / Thomson Learning™
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Espalhamento de raios-X pelos átomos
Cada átomo é um centro de espalhamento do raio-Xincidente para todas as direções
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O fenômeno da Difração
Somente direções específicas produzem interferência construtiva
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A Lei de Bragg
(c) 2003 Brooks/C
ole Publishing / T
homson L
earning
Lei de Bragg
É necessária masnão suficiente para adifração.
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Fator estrutural para a difração
ímparlkh
parlkhfFhkl ,0
,2p/ CCC
mistoslkh
pareslkhf
ímpareslkhf
Fhkl,,,0
,,,4
,,,4
p/ CFC
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Difratograma
(c) 2003 Brooks/C
ole Publishing / Thom
son L
earning
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Metais Amorfos Exibem somente ordem de curto
alcance Cristalizam no aquecimento Podem apresentar transição vítrea Propriedades diferentes com
relação aos equivalentes cristalinos, maior RM, menor E, maior dureza, maior resist. à corrosão, etc.