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diffusional creep

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Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004020
EISBN: 978-1-62708-185-6
... on creep mechanisms involving dislocation and diffusional flow, such as the Nabarro-Herring creep and the Coble creep. The equations for the several creep rates are also presented. Research on the mechanism of the superplastic flow in fine-grain metals has encompassed many ideas, such as the diffusional...
Book Chapter

By Sammy Tin
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005404
EISBN: 978-1-62708-196-2
... that the creep rate is proportional to the stacking-fault energy. Fig. 7 Larson-Miller plot for S-590 iron Fig. 8 Schematic showing the flow of atoms from compressive boundaries to tensile boundaries during diffusional Nabarro-Herring creep. Vacancy flow occurs in the direction opposite...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005433
EISBN: 978-1-62708-196-2
... and Diffusional Creep , Metall. Trans. , Vol 2 , 1971 , p 1113 – 1127 24. Ashby M.F. and Verrall R.A. , Diffusion-Accommodated Flow and Superplasticity , Acta Metall. , Vol 21 , 1973 , p 149 25. Mohamed F.A. and Langdon T.G. , Acta Metall. , Vol 32 , 1975 , p 697...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005183
EISBN: 978-1-62708-186-3
... describes creep mechanisms that are useful for illustrating the strong stress dependence of dislocation and diffusional flow. ambient temperature Isothermal constitutive modeling physical models strain hardening strain-rate-sensitive flow superplastic flow CONSTITUTIVE RELATIONS...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003287
EISBN: 978-1-62708-176-4
... in crystalline solids primarily include dislocation motion and atomic diffusion. Each process dominates in certain regimes of stress and temperature for a given material. Accordingly, the stress and temperature dependencies of the creep rate can be used to identify the relevant creep mechanisms. Diffusional...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003288
EISBN: 978-1-62708-176-4
... or Ashby maps, are constructed by plotting the shear stress (σ s ) normalized by the shear modulus ( G ), against the homologous temperature. Ashby maps for a turbine-blade alloy (MAR-M 200) are shown in Fig. 3 ( Ref 1 ). As discussed previously, the diffusional creep mechanism operates at low stresses...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003266
EISBN: 978-1-62708-176-4
... produce continuous plastic deformation (creep) with the application of a constant stress. For metals, various mechanisms are used to explain creep deformation, but all the mechanisms can fall into two basic categories: diffusional creep and dislocation creep ( Ref 10 ). In diffusional creep, diffusion...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002460
EISBN: 978-1-62708-194-8
...: Ref 4 Fig. 14 The microstructure of annealed cartridge brass (70Cu-30Zn), illustrating both grain boundaries and annealing twins. The twins are the regions with parallel sides within the grains. Source: Ref 1 Fig. 29 Diffusional creep results from a higher vacancy concentration...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005147
EISBN: 978-1-62708-186-3
... , 2004 , p 3111 10.1016/j.actamat.2004.03.012 16. Mukai T. , Tsutsui H. , Watanabe H. , Ishikawa K. , Okanda Y. , Kohzu M. , Tanabe S. , and Higashi K. , in Proceedings of the Eighth International Conference on Creep and Fracture of Engineering Materials...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005458
EISBN: 978-1-62708-196-2
... and mechanical properties: In early theories of cavitation in metallic materials, several key ideas were developed for creep deformation and then applied to superplastic and conventional hot deformation. In these approaches, creep at low stresses and the diffusional contribution to cavity enlargement were...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005512
EISBN: 978-1-62708-197-9
..., and that subsequently, bonding continues by various diffusional processes (including creep). The next qualitative model was proposed by King and Owczarksi ( Ref 4 ), who suggested that bonding takes place in three stages. The first two stages were as described previously, but migration of the interface away from...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005425
EISBN: 978-1-62708-196-2
... transformations based on classical nucleation theory and diffusional growth, and grain growth, among others, in the 1940s to1960s. Beginning in the 1980s, the incorporation of the fundamental concepts of thermodynamics and thermal physics (due to, for example, Gibbs, Ising, and others) led to a great expansion...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005606
EISBN: 978-1-62708-174-0
... Fig. 2 Sequence of metallurgical stages in diffusion bonding process. (a) Initial contact: limited to a few asperities (room temperature). (b) First stage: deformation of surface asperities by plastic flow and creep. (c) Second stage: grain-boundary diffusion of atoms to the voids and grain-boundary...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001350
EISBN: 978-1-62708-173-3
.... and Ashby M.F. , Pressure Sintering by Power Law Creep , Acta. Metall. , Vol 23 , 1975 , p 1277 – 1285 The DB process, that is, the application of pressure and temperature to an interface for a prescribed period of time, is generally considered complete when cavities fully close...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
.... , Fatigue, Creep, and Thermomechanical Fatigue Life Testing , Mechanical Testing and Evaluation , Vol 8 , ASM Handbook , 2000 , p 687 – 716 11. Aliabadi M.H. , Ed., Thermomechanical Fatigue and Fracture , WIT Press , 2002 12. Hulina V.E. , “Preliminary Results on the Mode...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005536
EISBN: 978-1-62708-197-9
... for Simulation of Diffusional Transformations in Alloys , J. Phase Equilibria , Vol 21 , 2000 , p 269 – 280 7. Andersson J.O. et al. , Thermo-Calc and DICTRA, Computational Tools for Materials Science , CALPHAD , Vol 26 , 2002 , p 273 – 312 8. Ågren J. , Numerical Treatment...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002413
EISBN: 978-1-62708-193-1
... stress extreme and leads to transgranular failure mechanism, while diffusional creep is characteristic at lower stresses. In general, the total deformation is composed of elastic, recoverable inelastic, and plastic portions. The irreversible (plastic) deformation is responsible for damage processes...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005293
EISBN: 978-1-62708-187-0
... Densification via Power Law Creep Diffusional Densification via Coble and Nabarro-Herring Creep A production line produces small investment castings; process control is excellent, and the shape of the casting allows a reliable and efficient gating and riser system. In such a case, it can be assumed...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002410
EISBN: 978-1-62708-193-1
... A. , Correlation of Creep-Fatigue Crack Growth Rates Using Crack Tip Parameters , Proc. 7th Int. Conf. Fracture: ICF-7 , Salama K. et al. , Ed., Pergamon Press , 1989 , p 189 – 196 116. Raj R. and Ashby M.F. , On Grain Boundary Sliding and Diffusional Creep , Metall. Trans. , Vol...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003448
EISBN: 978-1-62708-195-5
... 15.3 21 18.7 17.0 Al + 55 vol% Al 2 O 3 ( Ref 21 ) 5 18.0 16.4 12.8 19.5 17.7 29.2 24.0 21.8 Creep rupture data for Ti-SCS composites (nominally 35 vol%) Table 26 Creep rupture data for Ti-SCS composites (nominally 35 vol%) Matrix Orientation...