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diffusion creep

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Published: 01 June 2008
Fig. 15.9 Diffusion creep mechanisms More
Image
Published: 01 November 2012
Fig. 12 Diffusion creep mechanisms. Source: Ref 3 More
Image
Published: 01 June 2008
Fig. 15.3 Correlation between diffusion and creep activation energies More
Image
Published: 01 November 2012
Fig. 3 Correlation between diffusion and creep activation energies. Source: Ref 3 More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240265
EISBN: 978-1-62708-251-8
... temperature will creep and undergo a time-dependent increase in length. Since the mobility of atoms increases with increasing temperature, diffusion-controlled mechanisms become active. Dislocation mobility increases, slip becomes easier, new slip systems become available, and dislocation climb is aided...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610415
EISBN: 978-1-62708-303-4
... extends plastically. Thus, a metal subjected to a constant tensile load at elevated temperature will creep and undergo a time-dependent increase in length. Because the mobility of atoms increases with increasing temperature, diffusion-controlled mechanisms become active. Dislocation mobility increases...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060001
EISBN: 978-1-62708-343-0
... Abstract This chapter familiarizes readers with the mechanisms involved in creep and how they are related to fatigue behavior. It explains that what we observe as creep deformation is the gradual displacement of atoms in the direction of an applied stress aided by diffusion, dislocation...
Image
Published: 01 November 2011
Fig. 6.1 Sequence of metallurgical stages in the 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 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000017
EISBN: 978-1-62708-313-3
... dislocation movement and thereby improve alloy strength. Strengthening due to short-range order generally decreases rapidly above approximately 60 percent of the absolute melting temperature (0.6 T M ) due to increased diffusion. At temperatures above approximately 0.6 T M , creep and strength...
Image
Published: 01 July 2009
Fig. 1.2 One-to-one relationship of activation energy for self-diffusion with activation energy for creep of pure metals. Source: Ref 1.2 More
Image
Published: 01 August 2005
Fig. 2.89 Comparison of activation energies and activation volumes for steady-state creep and lattice self-diffusion for various materials above 0.5 T m . Source: Ref 2.62 More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000059
EISBN: 978-1-62708-313-3
... properties is not limited to tensile strength. Like all refractory elements, its large atomic size leads to inherently low diffusivity, which results in improved creep properties for the alloy with higher molybdenum contents ( Ref 23 ). Although tantalum also exhibits this positive influence on creep life...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490059
EISBN: 978-1-62708-340-9
... of mechanisms and equations have been proposed in the literature and have been reviewed elsewhere ( Ref 1 to 3 ). Fortunately, all these mechanisms can be fitted into two basic categories: (1) diffusional creep and (2) dislocation creep. In diffusional creep, diffusion of single atoms or ions either...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630237
EISBN: 978-1-62708-270-9
.... The principal types of elevated-temperature failure mechanisms discussed in this chapter are creep, stress rupture, overheating failure, elevated-temperature fatigue, thermal fatigue, metallurgical instabilities, and environmentally induced failure. The causes, features, and effects of these failures...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540047
EISBN: 978-1-62708-309-6
... images, diagrams, and explanations. It discusses the various factors that influence strength and ductility, including grain size, loading rate, and temperature. It also provides information on the origin of residual stresses, the concept of toughness, and the damage mechanisms associated with creep...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2004
DOI: 10.31399/asm.tb.ps.t62440189
EISBN: 978-1-62708-352-2
... Abstract This chapter presents several materials and processes related to soldering technology. It first provides information on lead-free solders, followed by sections devoted to flip-chip processes, diffusion soldering, and modeling. Scanning acoustic microscopy and fine-focus x-ray...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060049
EISBN: 978-1-62708-261-7
... Abstract This chapter introduces the concepts of mechanical properties and the various underlying metallurgical mechanisms that can be used to alter the strength of materials. The mechanical properties discussed include elasticity, plasticity, creep deformation, fatigue, toughness, and hardness...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240563
EISBN: 978-1-62708-251-8
... strengthening, they also form the basis for precipitation hardening. Slowly diffusing elements, such as molybdenum and tungsten, help in reducing creep at high temperatures. The most important precipitate in both nickel and iron-nickel superalloys is γ′, which is the fcc intermetallic compound Ni 3 (Al,Ti...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490265
EISBN: 978-1-62708-340-9
..., which usually results from higher steam pressures and temperatures, requires materials with greater creep resistance. Reliability, of course, involves a whole spectrum of material properties required to resist failure. The economically driven need for unit cycling in recent times has also required...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780314
EISBN: 978-1-62708-281-5
... Abstract This article describes the mechanisms of moisture-induced damage in polymeric materials, covering the characteristics of important structural plastics; the effects of moisture on glass transition temperature, modulus, creep, and stress relaxation of plastic materials; and moisture...