The direct observation of cooperative grain-boundary sliding and migration during superplastic deformation of lead-tin eutectic in shear

Zelin, M. G.; Dunlap, Michael R.; Rosen, R.S.; Mukherjee, Amiya K.

doi:10.1063/1.354302

Cited by 48 publications

(9 citation statements)

References 28 publications

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“…(2) Langdon (1997) evaluated a constitutive relationship between strain rate and stress, based on a dislocation-glide accommodation mechanism that is controlled by dislocation climb. This cooperative grain-boundary sliding has been recently reported in alloys (Zelin et al 1993, Astanin et al 1994, 1997, Zelin and Mukherjee 1995 and seems to be the most plausible deformation mechanism for HSRS of composite materials. This proposal appears to be supported by our results in the Al± Bi alloy, indicating the annihilation of dislocations by the discontinuous liquid phase and the concomitant stress accommodation.…”

Section: §1 Introductionsupporting

confidence: 74%

Effects of the liquid phase on the high-temperature tensile ductility: from embrittlement to superplasticity

Oikawa¹

1998

Philosophical Magazine A

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Inclusions of liquid phase are generally considered to cause liquid-metal embrittlement. On the other hand, there have been some reports implying the enhancement of tensile elongation by liquid inclusions. In this paper, the possibility of elongation enhancement by liquid and its underlying mechanism were investigated in a model binary system of Al± Bi and a composite of (Al± Mg)± Si 3 N 4 . Clear evidence of elongation enhancement was observed in the Al± Bi alloy. Liquid inclusions of Bi were found to assist stress accommodation processes and to delay cavitation failure. In the (Al± Mg)± Si 3 N 4 composite, a close correlation was found between the incipient melting temperature and an optimum temperature for high-strain-rate superplasticity. The liquid phase was observed along grain boundaries and interfaces of the composite, suggesting a similar stress accommodation process to that of the Al± Bi alloy. The interface microstructure was also studied by high-resolution transmission electron microscopy to understand the detailed mechanism of high-strain-rate superplasticity. 604J. Koike et al. Figure 4. Cavity volume fraction plotted as a function of plastic strain, deformed at 10 -4 s -1 at 500 K (below T M) and 565 K (above T M) .

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Section: §1 Introductionsupporting

confidence: 74%

Effects of the liquid phase on the high-temperature tensile ductility: from embrittlement to superplasticity

Oikawa¹

1998

Philosophical Magazine A

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“…8 is the alignment of grain boundaries of many grains to facilitate the grain boundary sliding [107]. The small grain sizes of nc materials [37] make it easier for the grain alignment [80,116]. Such a coordinated grain boundary sliding may play a significant role in the deformation of nc materials, as shown in Fig.…”

Section: Grain Boundary Slidingmentioning

confidence: 99%

Deformation twinning in nanocrystalline materials

Zhu

Liao

2012

Progress in Materials Science

1,110

447

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“…The formation of DRX grain at these junctions may indicate the activation of the grain boundary sliding as an important DRX mechanism at such low Z values. [36][37][38] One of the most obvious differences between the low and moderate (or high) Z conditions is the grain size distribution in the final microstructure ( Figure 15). Unlike the moderate or high Z values, in the low Z conditions the grain size distribution is not homogeneous and some very large grains were mixed among very small grains.…”

Section: B Microstructural Evolutionmentioning

confidence: 99%

Hot Deformation and Recrystallization of Austenitic Stainless Steel: Part I. Dynamic Recrystallization

Dehghan-Manshadi

Barnett

Hodgson

2008

Metall Mater Trans A

206

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The hot deformation behavior of a 304 austenitic stainless steel was investigated to characterize the evolution of the dynamically recrystallized structure as a starting point for studies of the postdeformation recrystallization behavior. The effect of different deformation parameters such as strain, strain rate, and temperature were investigated. The flow curves showed typical signs of dynamic recrystallization (DRX) over a wide range of temperatures and strain rates (i.e., different Zener-Hollomon (Z) values). However, under very high or very low Z values, the flow curves' shapes changed toward those of the dynamic recovery and multiple peaks, respectively. The results showed that while DRX starts at a strain as low as 60 pct of the peak strain, a fully DRX microstructure needs a high strain of almost 4.5 times the initiation strain. The DRX average grain size showed power-law functions with both the Zener-Hollomon parameter and the peak stress, although power-law breakdown was observed at high Z values.

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The direct observation of cooperative grain-boundary sliding and migration during superplastic deformation of lead-tin eutectic in shear

Cited by 48 publications

References 28 publications

Effects of the liquid phase on the high-temperature tensile ductility: from embrittlement to superplasticity

Effects of the liquid phase on the high-temperature tensile ductility: from embrittlement to superplasticity

Deformation twinning in nanocrystalline materials

Hot Deformation and Recrystallization of Austenitic Stainless Steel: Part I. Dynamic Recrystallization

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