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boundary sliding

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Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004018
EISBN: 978-1-62708-185-6
... Abstract Plastic deformation can occur in metals from various mechanisms, such as slip, twinning, diffusion creep, grain-boundary sliding, grain rotation, and deformation-induced phase transformations. This article emphasizes on the mechanism of slip and twinning under cold working conditions...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003167
EISBN: 978-1-62708-199-3
... Abstract A sliding bearing (plain bearing) is a machine element designed to transmit loads or reaction forces to a shaft that rotates relative to the bearing. This article explains the role of wear damage mechanisms in the design and selection of bearing materials, and its relationship with...
Book Chapter

By Peter J. Blau
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003242
EISBN: 978-1-62708-199-3
... dependent variable, such as the wear rate or the dominant type of dominant wear mechanism. Wear rates or boundaries between dominating wear mechanisms are represented as families of curves or boundaries on the “map.” Examples of the variables used in wear maps for sliding wear are load (or normal force or...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003060
EISBN: 978-1-62708-200-6
..., turbine wheels, ceramic valves, and sliding parts. conceptual design detailed design engine component design proof testing properties of structural ceramics structural ceramics THE DESIGN PROCESS for ceramic materials is generally more complex than that for metals because of the ceramic...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003177
EISBN: 978-1-62708-199-3
... nonferrous metals. The article reviews the various types of forming processes such as blanking, piercing, fine-edge blanking, press bending, press forming, forming by multiple-slide machines, deep drawing, stretch forming, spinning, rubber-pad forming, three-roll forming, contour roll forming, drop hammer...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003157
EISBN: 978-1-62708-199-3
... article also focuses on brush contact materials and their interdependence factors for sliding contacts. In addition, the article discusses the properties, manufacturing methods, and applications of electrical contact materials, including wrought materials such as copper metals, silver metals, gold metals...
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
... grain-mantle deformation ( Ref 44 , 45 ), and so on. While these have broadened the view of the underlying physics of micrograin superplasticity, controversy still exists on the details of the microscopic process of deformation. A few known facts are: Sliding of grains along grain boundaries is...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000610
EISBN: 978-1-62708-181-8
... associated with cracking at grain-boundary triple points. 100×. Fig. 689 : Wedge-type cavities (wedge cracks) form at triple points due to grain-boundary sliding and may be promoted by decohesion at interfaces between grain-boundary precipitates and the matrix, as shown here in a type 316 sample. 600×. Fig...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005208
EISBN: 978-1-62708-187-0
... Abstract This article begins with balance equations for mass, momentum, energy, and solute and the necessary boundary conditions for solving problems of interest in casting and solidification. The transport phenomena cover a vast range of length and time scales, from atomic dimensions up to...
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
... superplastic and hot forming processes. Grain-boundary cavitation, observed under temperature and strain-rate conditions for which the boundaries are weaker than the grain interiors, often results from grain-boundary sliding and the concentration of strain around nondeformable particles and hard second phases...
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
... microstructural or mechanistic description. As a rule of thumb, elongation in excess of 200% is termed as superplasticity. Over the years, a number of superplasticity models have been proposed. A majority of experimental evidences suggests that grain-boundary sliding (GBS) is the dominant deformation mechanism...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009013
EISBN: 978-1-62708-185-6
... surfaces of grain-boundary sliding or cooperative grain-boundary sliding within the material ( Ref 8 ). Consequently, although a given processing map might seem suitable to design how a material should be processed under specific conditions, it might not correspond to the controlling mechanism throughout...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.9781627081863
EISBN: 978-1-62708-186-3
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005409
EISBN: 978-1-62708-196-2
... deformation is accomplished largely by grain-boundary sliding and secondarily by dislocation-glide processes. Thus, the enhancement of diffusion during superplastic flow would be expected to be less than that during higher-strain-rate conventional forming. Hence, the observed increase in coarsening kinetics...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009003
EISBN: 978-1-62708-185-6
... changes in deformation behavior and fracture mode. At temperatures above one-half the melting point, particularly at low strain rates, grain-boundary sliding becomes prominent. This leads to wedge-shaped cracks that propagate along grain boundaries and result in low ductility. Such cracking is common at...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004017
EISBN: 978-1-62708-185-6
... changes in deformation behavior and fracture mode. At temperatures above one-half the melting point, particularly at low strain rates, grain-boundary sliding becomes prominent. This leads to wedge-shaped cracks that propagate along grain boundaries and result in low ductility. Such cracking is common at...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0001834
EISBN: 978-1-62708-181-8
... substantial σ phase. All 240× Examination of properly polished specimens without etching often presents a clearer picture of the extent of fracture because etched microstructural detail does not obscure the crack detail. Etching presents other dark linear features, such as grain boundaries, that may be...
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
... constitutive description of the strain-rate-dependent behavior of engineering alloys must take into account the intrinsic causes of damage accumulation in the form of cavitation, dislocation evolution, and grain-boundary sliding. Moreover, because creep occurs at elevated temperatures, seldom does the...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0001831
EISBN: 978-1-62708-181-8
... ). Grain-boundary sliding as a result of an applied tensile stress can produce sufficient stress concentration at grain-boundary triple points to initiate and propagate wedge cracks ( Ref 50 , 51 , 52 , 55 , 56 , 58 , 59 , 60 , 61 ). Cracks can also nucleate in the grain boundary at locations other...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003973
EISBN: 978-1-62708-185-6
... forming sheet metal. Forging presses deliver their maximum force within 3.2 mm ( 1 8 in.) of the end of the stroke because maximum pressure is required to form the flash. The slide velocity in a forging press is faster than that in a sheet metal deep-drawing press because in forging it is...