Hall&amp;ndash;Petch Relationship and Dislocation Model for Deformation of Ultrafine-Grained and Nanocrystalline Metals

Kato, Masaharu

doi:10.2320/matertrans.ma201310

Cited by 90 publications

(34 citation statements)

References 67 publications

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“…From the results, it can deduced that PPS has strengthening capacity as a filler in AA6063 alloy, however, the mechanical properties that could be obtained depends on the particle size of the filler used to reinforce the matrix. Also, due to the ability of PPS to refine the grains of the alloy as shown in the micrographs (Figures 2-5), improved ductility, strength and toughness were observed in the composites reinforced with smaller particle size PPS over those of the alloy as shown in Figure 10, 12 and 13 in line with Hall Petch Equation [20].However, at bigger particle size of the filler, due to small surface area of filler, poor wettability and poor filler dispersion at higher weight fraction, the porosity of the composite increases which gives rise to lower strength at high percentage of the filler in the matrix.…”

Section: Tensile Propertiesmentioning

confidence: 57%

Assessment of some mechanical properties and microstructure of particulate periwinkle shell-aluminium 6063 metal matrix composite (PPS-ALMMC) produced by two-step casting

Umunakwe¹,

Olaleye²,

Oyetunji³

et al. 2017

Nig. J. Tech.

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This work investigates some mechanical properties and microstructures of PPS-AlMMC and compares the properties of the composites and those of the aluminium 6063 (AA6063) alloy. Periwinkle shells were milled to particle sizes of 75µm and 150µm and used to produce PPS-AlMMC at 1,5,10 and 15wt% filler loadings using two-step casting technique. The mechanical properties and microstructures of the composite materials were compared with those of the AA6063 alloy. It was observed that the filler distributes uniformly in the matrix due to the two-step casting technique. Improved strength, ductility, hardness and modulus were obtained when the filler was used to reinforce the alloy. However, using a filler of bigger particle size resulted to reduced tensile strength, ductility and toughness of composites.

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Section: Tensile Propertiesmentioning

confidence: 57%

Assessment of some mechanical properties and microstructure of particulate periwinkle shell-aluminium 6063 metal matrix composite (PPS-ALMMC) produced by two-step casting

Umunakwe¹,

Olaleye²,

Oyetunji³

et al. 2017

Nig. J. Tech.

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“…(4) The stress/strain pile-up at the grain boundary because of the irregular configuration of the grain boundary. This is the question of investigating the dislocation pile-up [62] and measuring the stress field at the grain boundary [47]. The future research may start from the existing theories and methods, and then go further to evaluate the configuration-based effects at the grain boundary.…”

Section: Implications For Further Researchmentioning

confidence: 99%

Crack Propagation Mechanisms for Creep Fatigue: A Consolidated Explanation of Fundamental Behaviours from Initiation to Failure

Liú

Pons

2018

Metals

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Background-Creep-fatigue damage is generally identified as the combined effect of fatigue and creep. This behaviour is macroscopically described by crack growth, wherein fatigue and creep follow different principles. Need-Although the literature contains many studies that explore the crack-growth path, there is a lack of clear models to link these disparate findings and to explain the possible mechanisms at a grain-based level for crack growth from crack initiation, through the steady stage (this is particularly challenging), ending in structural failure. Method-Finite element (FE) methods were used to provide a quantitative validation of the grain-size effect and the failure principles for fatigue and creep. Thereafter, a microstructural conceptual framework for the three stages of crack growth was developed by integrating existing crack-growth microstructural observations for fatigue and creep. Specifically, the crack propagation is based on existing mechanisms of plastic blunting and diffusion creep. Results-Fatigue and creep effects are treated separately due to their different damage principles. The possible grain-boundary behaviours, such as the mismatch behaviour at grain boundary due to creep deformation, are included. The framework illustrates the possible situations for crack propagation at a grain-based level, particularly the situation in which the crack encounters the grain boundary. Originality-The framework is consistent with the various creep and fatigue microstructure observations in the literature, but goes further by integrating these together into a logically consistent framework that describes the overall failure process at the microstructural level.

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“…Jadi, dengan mengubah ukuran butir satu dapat mempengaruhi gerakan dislokasi dan menghasilkan kekuatan. Misalnya, perlakuan panas setelah deformasi plastik dan mengubah laju pemadatan adalah cara untuk mengubah ukuran butir [7].…”

Section: F Hall Petch Equationunclassified

Studi Pengaruh Pemanasan Awal pada Pengelasan Ulang Baja ASTM A36 akibat Reparasi terhadap Sifat Mekanis menggunakan Proses Las FCAW

Pangaribowo¹,

Putra²

2019

JTITS

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Hall–Petch Relationship and Dislocation Model for Deformation of Ultrafine-Grained and Nanocrystalline Metals

Cited by 90 publications

References 67 publications

Assessment of some mechanical properties and microstructure of particulate periwinkle shell-aluminium 6063 metal matrix composite (PPS-ALMMC) produced by two-step casting

Assessment of some mechanical properties and microstructure of particulate periwinkle shell-aluminium 6063 metal matrix composite (PPS-ALMMC) produced by two-step casting

Crack Propagation Mechanisms for Creep Fatigue: A Consolidated Explanation of Fundamental Behaviours from Initiation to Failure

Studi Pengaruh Pemanasan Awal pada Pengelasan Ulang Baja ASTM A36 akibat Reparasi terhadap Sifat Mekanis menggunakan Proses Las FCAW

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