Grain boundary sliding and the observation of superplasticity in pure metals

Ahlquist, C.N.; Menezes, R.A

doi:10.1016/0025-5416(71)90150-9

Cited by 6 publications

(1 citation statement)

References 5 publications

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“…contribution of this relaxation mechanism is assumed to be unimportant in .the deformation process. Creep studies at low stress levels have also revealed that scratch offsetting, grain rotation, and granular surface roughening can occur while an equiaxed grain structure is maintained [32]. These observations are consistent with the description of creep as a grain boundary sliding process.…”

Section: Missing Mechanismssupporting

confidence: 79%

Deformation Mechanism Maps — A Review with Applications

Notis

1975

Deformation of Ceramic Materials

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Deformation mechanism mapping has recently evolved as a method for quantitatively expressing complex deformation equations while at the same time allowing visual insight into our understanding of these deformation processes. Techniques for the generation of deformation mechanism maps are described, specific applications in the literature to date are reviewed, and some applications not previously considered are presented. These include the examination of sequential dependent deformation processes, grain boundary sliding, and the use of deformation mechanism maps to interpret pressure-sintering kinetics.

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Section: Missing Mechanismssupporting

confidence: 79%

Deformation Mechanism Maps — A Review with Applications

Notis

1975

Deformation of Ceramic Materials

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The nature of grain boundary sliding and the superplastic flow

Valiev¹,

Kaĭbyshev²,

Astanin³

et al. 1983

Phys. Stat. Sol. (a)

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Two types of grain boundary sliding are established and investigated during Zn bicrystal deformation: "pure" grain boundary sliding (GBS) which is not associated with intragranular sliding (IS) and GBS which develops simultaneously with IS. Both types of GBS exhibit greatly simi1a.r structural peculiarities but under identical deformation conditions the second type GBS has a much higher rate with a WLGBS paramet'er decreasing from 1 to 0.4. The comparative analysis of GBS regularities in Zn bicrystals and the superplastic Zn-0.4% A1 alloy attests t'o the fact t1ia.t "pure" GBS determines the strain hardening at superplastic deformation while GBS of the second type determines the development of the recovery processes. It is shown that these concepts may serve as a basis for the elucidation of many experiment'ally observed peculiarities of the superplastic flowthe existence of the initial unsteady and steady state &ages, decrease of flow stress after short-term deformation a t elevated rates, and others.Zwei Arten von Korngrenzengleitung werden aufgestellt und wahrend der Zn-Bikristalldeformation untersucht : ,,reine" Korngrenzengleitung (GBS) die nicht mit intragranularer Gleitung (IS) verbunden ist und GBS, die sich gleichzeitig mit IS entwickelt. Beide Arten von GBS zeigen stark ahnliche strukturelle Besonderheiten, jedoch hat unter identischen Deformationsbedingungen der zweite GBS-Typ cine vie1 hohere Rate mit einem mGBs-Parameter, der von 1 auf 0,4 abnimmt. Die vergleichende Analyse der GBS-GesetzmaDigkeiten in Zn-Bikristallen und der superplastischen Zn-0,4y0 Al-Legierung ergibt, daa ,,reine" GBS die Spannungshartung bei superplastischer Deformation bestimmt, wahrend GBS vom zweiten Typ die Entwicklung des Erholungsprozesses bestimmt. Es wird gezeigt, dad diese Vorstellungen als Grundlage fur die Aufklarung vieler experimentell beobachteter Besonderheiten des superplastischen Flusses dienen kanndie Existenz des unstetigen Anfangszustandes und stetiger Zustande, Absinken der F l u b spannung nach kurzzeitiger Deformation bei ausgewahlten Raten und andere.

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The superplastic flow of aluminium bronzes

Bright¹,

Taplin²

1975

Rheological Theories · Measuring Techniques in Rheology Test Methods in Rheology · Fractures Rheological Properties of Material

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Grain boundary sliding and the observation of superplasticity in pure metals

Cited by 6 publications

References 5 publications

Deformation Mechanism Maps — A Review with Applications

Deformation Mechanism Maps — A Review with Applications

The nature of grain boundary sliding and the superplastic flow

The superplastic flow of aluminium bronzes

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