Applications to Specific Processes: Bibliography

Johnson, William B.

doi:10.1016/b978-0-08-025452-4.50009-9

Cited by 4 publications

(6 citation statements)

References 289 publications

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“…Two of the principal features of the measured deformation field are the dead metal zones, and the shear bands seen in the strain rate field (figure 7) which are the analogue of slip lines. The observed dead metal zones are compatible with both Prandtl's slip line field solution and laminar flow resulting from dislocation loop punching (Johnson et al 1970, Friedel 1964. Preliminary analysis of the measured deformation field data suggests qualitative agreement with Prandtl's slip line field.…”

Section: Discussionsupporting

confidence: 65%

Characterization of deformation field in plane-strain indentation of metals

Murthy

Huang

Chandrasekar³

2008

J. Phys. D: Appl. Phys.

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A study has been made of the deformation field in plane-strain indentation of metals with a flat punch. Deformation field parameters such as velocity and strain rate have been measured using the technique of particle image velocimetry. For this purpose, images of the indentation region were recorded in situ during the deformation process, and motion of ‘asperities’ specially introduced onto a side of the sample being indented was analysed. The velocity and strain rate fields in and around the indentation zone were obtained from an analysis of the asperity motions. The measurements have shown, among other things, the presence of a dead metal zone underneath the indenter, the formation and evolution of regions of intense strain rates or shear bands and a linear variation of the strain rate with indentation speed. Many of the characteristics of the deformation field, e.g. slip lines and dead metal zone, compare favourably with those inferred from classical solutions for this indentation problem. Extensions of the technique for the study of strain field around indentations and deformation in plane-strain indentation by wedges and cylinders are discussed.

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Section: Discussionsupporting

confidence: 65%

Characterization of deformation field in plane-strain indentation of metals

Murthy

Huang

Chandrasekar³

2008

J. Phys. D: Appl. Phys.

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“…41 If the pin were advancing as a simple punch, the metal in front of it would divide in two and ascend on both sides as in a piercing. 5 There would be friction with the pin, giving rise to a dead zone with a shear strain rate and temperature declining into the body of the advancing shell. [6][7][8][9][10][11][12][13][14] If the pin is rotated counter clockwise, material is sheared to the right retreating side; this becomes more effective as the rotating speed increases relative to the advance rate.…”

Section: Discussionmentioning

confidence: 99%

“…Aspects of the plastic flow in FSW can be clarified by examining some exhaustively studied processes the similarities to and differences from the plane strain flow in punching or piercing that entail considerable rise in temperature. Previous analyses have shown 5 that piercing is the centre line transposition of extrusion for which accumulated knowledge and experience provide many pertinent insights. [6][7][8][9][10] After suitable analysis of the microstructural developments in these processes, an explanation of the TMAZ and nugget substructure formation is advanced and shown to be consistent with the observations.…”

Section: Introductionmentioning

confidence: 99%

Piercing/extrusion and FSW nugget microstructure formation in Al alloys

McQueen¹,

Cabibbo²,

Evangelìsta³

2007

Materials Science and Technology

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Friction stir welding generates complex microstructures in the nugget and thermomechamically affected zones that have led to diverse explanations. Consideration as an extension of microstructure development in piercing/extrusion can lead to a better understanding of flow patterns and microstructures during friction stir welding. The nugget, thermomechanically affected and heat affected zones were microstructurally characterised in terms of grain and cell structures and of strain, strain rate and temperatures. The microstructure between the advancing and retreating zones showed an asymmetry in size and shape of grains and cells, clearly owing to a different level of strain rate to which were subjected the two zone as the pin passed.

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“…This process is time independent. Now, assuming the radius after deformation to be r 0 , we have r 0 5r 1 2a, where r 1 is the initial void radius, and a is the half contact width of the void ridge after plastic deformation, which can be described by 20…”

Section: Diffusion Bonding Modelmentioning

confidence: 99%

Application of diffusion bonding model to superplastic γ-TiAl alloys

Wang¹,

Luo²,

Yu³

et al. 2006

Materials Science and Technology

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In the present work, the superplastic characteristics of some γ-TiAl alloys were analysed on the bases of experimental data reported in previous work, and their suitability for diffusion bonding was examined. The constitutive equation ∊ = A DGb/ kT ( b/ d)p ( σ− σ 0/ G)n can be used to describe superplasticity in γ-TiAl alloys, and the equation predicts n=2, p=2, and activity energy Q=220 kJ mol−1. It is suggested that the diffusion bonding model for γ-TiAl alloys should be considered two stages, i.e. a plastic deformation stage and a void shrinkage stage including both a diffusion controlled process and a plastic controlled process. Theoretical predictions for obtaining good bonding conditions were in good agreement with experimental results. Using a theoretical bonding model, a prediction map showing the relationship among temperature, applied stress and time for high quality diffusion bonding of superplastic γ-TiAl alloys was obtained.

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Applications to Specific Processes: Bibliography

Cited by 4 publications

References 289 publications

Characterization of deformation field in plane-strain indentation of metals

Characterization of deformation field in plane-strain indentation of metals

Piercing/extrusion and FSW nugget microstructure formation in Al alloys

Application of diffusion bonding model to superplastic γ-TiAl alloys

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