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crystallographic orientation

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Published: 01 June 2019
Fig. 4 SEM fracture-surface analysis of the failed hip prosthesis shown in Fig. 1 . (a) Fracture surface showing three distinct grains labeled A, B, and C. (b) Grain A has a shallow crystallographically oriented fracture structure. (c) Grain B has a crystallographically oriented fracture More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048423
EISBN: 978-1-62708-226-6
... are oriented differently with respect to the propagating crack and therefore exhibit different crystallographic fracture patterns. Grain A ( Fig. 4b ) has a relatively flat texture, but also shows crystallographically oriented structures. Grain B ( Fig. 4c ) is characterized by a staircase pattern. Material...
Image
Published: 01 June 2019
in the grain at the lower right-hand corner. Other fracture features are crystallographically oriented. (d) Microstructure of cross section reveals that plate was made from cold-worked stainless steel of high microcleanliness. 80x More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048403
EISBN: 978-1-62708-226-6
..., the fracture surface of the cast cobalt-chromium-molybdenum alloy screw had an erratic structure ( Fig. 3a ), which can be explained by the large grain size and the tendency of the grains to fracture along crystallographic planes. Figure 3(b) shows such fracture planes of differently oriented grains...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048413
EISBN: 978-1-62708-226-6
... surface. Fatigue striations can be seen in the grain at the lower right-hand corner. Other fracture features are crystallographically oriented. (d) Microstructure of cross section reveals that plate was made from cold-worked stainless steel of high microcleanliness. 80x The microstructure...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001819
EISBN: 978-1-62708-180-1
... 13(b) shows such fracture planes of differently oriented grains. These planes exhibited crystallographically oriented mixed shearing structures and dimples ( Fig. 13c ), as well as traces of slip ( Fig. 13d ). Gas holes with dendritic freezing surfaces are shown in Fig. 13(e) . In the longitudinal...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003536
EISBN: 978-1-62708-180-1
... in detail in the article “Image Analysis” in Materials Characterization , Volume 10 of ASM Handbook . The electron backscatter diffraction (EBSD) technique of crystallographic orientation imaging and its combination with stereo-pair based SEM fractography is useful for characterization...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001660
EISBN: 978-1-62708-236-5
... alternated between an up or down orientation in approaching the flat fracture surface ( Figure 3 ) and exhibited a faceted appearance in some locations ( Figure 3 ). The dimples found on the shear band surface were small, partially formed and generally equiaxed ( Figure 4 ). The remaining portion...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003539
EISBN: 978-1-62708-180-1
... parts, designated stage I and stage II. Stage I propagation occurs on specific crystallographic planes with greatest resolved fluctuating shear stress. Stage II propagation occurs on planes normal to the fluctuating tensile stress. Certain metals (such as aluminum alloys) and loading conditions...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006776
EISBN: 978-1-62708-295-2
... parts, designated stage I and stage II. Stage I propagation occurs on specific crystallographic planes with greatest resolved fluctuating shear stress. Stage II propagation occurs on planes normal to the fluctuating tensile stress. Certain metals (such as aluminum alloys) and loading conditions...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0091853
EISBN: 978-1-62708-223-5
... strength of 70 MPa (10 ksi) in the transverse direction. On slow cooling, quartz forms a tetrahedral silicate structure, with silicon at the center and oxygen atoms occupying the corners. Quartz fractures conchoidally along crystallographic planes when fractured. The sharp, angular shape of the quartz...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003528
EISBN: 978-1-62708-180-1
...(c) are most often caused by a nonrandom crystallographic orientation of the coherently diffracting domains in the volume sampled by the incident x-ray beam, that is, material condition. Fig. 2 Common types of d -spacing versus sin 2 ψ plots. (a) Linear: exhibiting no shear stress. (b...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006768
EISBN: 978-1-62708-295-2
... -spacing versus sin 2 ψ plots obtained via XRD, are generally evidence of shear stress and/or instrument misalignment ( Ref 1 ). Data similar to that found in Fig. 2c are most often caused by a nonrandom crystallographic orientation of the coherently diffracting domains in the volume sampled...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006774
EISBN: 978-1-62708-295-2
... and Brittle Fracture in Metals” in this Volume. Macroscopic Features Macroscopic features typically help identify the fracture initiation site and crack propagation direction. The orientation of the fracture surface, the location of crack initiation site(s), and the crack propagation direction should...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003537
EISBN: 978-1-62708-180-1
... and K Issc Decreased resistance to fatigue crack growth Crystallographic texture in α-β titanium alloys Preferred orientation of the hexagonal α phase in microstructures with individual α and β grains Crack blunting, branching and irregularity depend on texture Complex and strong...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001825
EISBN: 978-1-62708-241-9
... of a feathery, crystallographic morphology. This morphology is consistent with a fatigue fracture mechanism [ 1 ]. Faint microscopic striations observed in a few areas of the facture surface were further evidence of the fatigue fracture mechanism for these cracks. Fatigue fractures occur due to cyclic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001657
EISBN: 978-1-62708-227-3
... was damaged, examination in the SEM revealed several areas of well-defined fatigue striations and microscopic crack growth bands, Figure 4 . A specific fatigue crack nucleation site could not be readily identified, but the orientation of the crack growth bands and striations in area A, Figure 3 , suggested...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006775
EISBN: 978-1-62708-295-2
... or to fail in a brittle manner, depending on specimen orientation. Specimen axes removed from 〈1,1,0〉 failed in a brittle manner, but specimens oriented near 〈1,1,0〉 did not fail in a brittle manner. This implies that duplex slip (simultaneous slip on more than one system) favored by the harder orientations...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003538
EISBN: 978-1-62708-180-1
... orientation. Specimen axes removed from ⟨1,1,0⟩ failed in a brittle manner, but specimens oriented near ⟨1,1,0⟩ did not fail in a brittle manner. This implies that duplex slip (simultaneous slip on more than one system) favored by the harder orientations promotes brittle fracture. The third model shown...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003543
EISBN: 978-1-62708-180-1
... Transgranular cleavage is cracking through the discrete grains. Intracrystalline is an equally descriptive term, but is not preferred terminology. Crystallographic cleavage occurs preferentially in individual grains in directions that do not readily deform, by slip processes, under strain. Therefore...