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hexagonal crystal structures

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Published: 15 December 2019
Fig. 7 Stereographic triangle color keys for cubic and hexagonal crystal structures. (a) Cubic m3m symmetry. (b) Hexagonal 6/mmm symmetry More
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005144
EISBN: 978-1-62708-186-3
... Abstract In terms of forming, magnesium alloys are much more workable at elevated temperatures due to their hexagonal crystal structures. This article describes the deformation mechanisms of magnesium and provides information on the hot and cold forming processes of magnesium alloys...
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Published: 01 January 1990
Fig. 24 Crystal structure of Ti 3 Al. (a) D 0 19 hexagonal superlattice structure of Ti 3 Al with lattice constants of c = 0.420 nm and a = 0.577 nm. (b) Possible slip planes and slip vectors in the structure More
Book Chapter

Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0006544
EISBN: 978-1-62708-183-2
... Abstract The crystal structure of a material is an important aspect of corrosion and oxidation processes. This article provides a general introduction to the crystal structure of materials, providing information on the crystal systems, lattice dimensions, nomenclature, and solid-solution...
Image
Published: 01 December 2008
Fig. 3 Crystalline structure of graphite. (a) Crystal of graphite bounded by (0001) and ( 10 1 ¯ 0 ) type planes; the hexagonal arrangement of the atoms within the (0001) plane is shown relative to the bounding ( 10 1 ¯ 0 ) faces. (b) Hexagonal structure More
Image
Published: 01 December 2004
Fig. 2 Spiral morphology of Zn-MgZn 2 eutectic in a zinc-magnesium binary alloy. This striking hexagonal eutectic microstructure is partially a result of the crystal structure of the individual phases. The crystal structure does not often reveal its characteristics in such a direct way More
Image
Published: 01 June 2016
Fig. 3 Crystal structures for different phases in titanium alloys. (a) Body-centered cubic β phase. (b) Hexagonal close-packed α (α′) phase. (c) Orthorhombic α″ phase. (d) Hexagonal ω phase More
Image
Published: 01 January 1986
Fig. 1 Crystal structures of two forms of carbon. (a) The structure of diamond results when each carbon atom bonds to four of its neighbors in a tetrahedral arrangement within a cubic unit cell. The C-C bond length is approximately 1.54 Å. (b) The crystal structure of graphite is described More
Image
Published: 30 September 2014
Fig. 3 Orthorhombic crystal structure of cementite (Fe 3 C, or ε-carbide), which contains 93.3% iron and 6.67% carbon. The spherical components shown are iron (Fe) atoms. Each carbon atom is surrounded by eight iron atoms, or each iron atom is connected to three carbon atoms. The crystal More
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Published: 01 January 2000
Fig. 2 Examples of crystal structures. Unit cells: (a) simple cubic, (b) face-centered cubic, (c) body-centered cubic, and (d) hexagonal close-packed. A crystal lattice: (e) three-dimensional simple cubic More
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Published: 01 January 1989
Fig. 2 Crystal structure of diamond (a) and CBN (b) and their allotropes, graphite (c) and hexagonal boron nitride (d) More
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Published: 01 June 2012
Fig. 4 Schematic representation of the stacking sequence of (a) face-centered cubic and (b) hexagonal close-packed crystal structures More
Image
Published: 01 December 2004
Fig. 22 Domain images of a barium ferrite single crystal (85 μm thick) with hexagonal plane normal to the plane of the sample. (a) Faraday effect image showing the characteristic domain structure throughout the thickness of the sample. (b) Bitter pattern of the same area as (a), indicating More
Image
Published: 27 April 2016
Fig. 2 Arrangement of atoms: (a) face-centered cubic (fcc), (b) hexagonal close-packed (hcp), and (c) body-centered cubic (bcc) crystal structures. Source: Ref 2 More
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Published: 01 November 1995
Fig. 36 Structure of borides. Source: Ref 81 , 82 , 83 Formula Metal Crystal system and structural type Arrangement of boron atoms M 4 B Pd, Pt Cubic, Pt 4 B-type Isolated atoms M 2 B Ta, Cr, Mo, W, Fe, Ni, Co Tetragonal, CuAl 2 -type Isolated atoms M 5 B 3 More
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Published: 01 December 2009
Fig. 9 Effect of grain size on the yield strength for different crystal structures. hcp, hexagonal close-packed; bcc, body-centered cubic; fcc, face-centered cubic. Source: Adapted from Ref 19 , Fig. 7.32 More
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003084
EISBN: 978-1-62708-199-3
... Abstract Crystal structure is the arrangement of atoms or molecules in the solid state that involves consideration of defects, or abnormalities, in idealized atomic/molecular arrangements. The three-dimensional aggregation of unit cells in the crystal forms a space lattice or Bravais lattice...
Book Chapter

Series: ASM Handbook
Volume: 3
Publisher: ASM International
Published: 27 April 2016
DOI: 10.31399/asm.hb.v03.a0006292
EISBN: 978-1-62708-163-4
... for hexagonal crystals, because hexagonal crystals may be regarded as base-centered orthorhombic. Structure Symbols Structure symbols are arbitrary symbols that designate the type of crystal structure. The Strukturbericht symbols ( Ref 2 ) were widely used in the past and are still used today...
Book Chapter

Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003722
EISBN: 978-1-62708-177-1
... , or as the a or b face, denoted by A or B , because the choice of axes is arbitrary and does not alter the actual translations of the lattice. (b) The symbol C may be used for hexagonal crystals, because hexagonal crystals may be regarded as base-centered orthorhombic. Structure Symbols...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006282
EISBN: 978-1-62708-169-6
.... Deformation also occurs by twinning, which is favored over slip by coarse grain size, high purity, and low-temperature deformation. The hexagonal close-packed (hcp) crystal structure is less symmetrical than the body-centered cubic (bcc) lattice. As a result, directionality in certain properties...