Microstructure and evolution of mechanically-induced ultrafine grain in surface layer of AL-alloy subjected to USSP

Wu, Xiaolei; Tao, Nengguo; Yang, Hong; Xu, Bingshe; Lü, Jian; Lu, K.

doi:10.1016/s1359-6454(02)00051-4

Cited by 444 publications

(219 citation statements)

References 27 publications

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“…By contrast, the exploratory friction-stir experiment [7] and surface mechanical attrition treatment (SMAT) [8][9][10][11] may effectively reduce the structural length scale to 10-50 nm. Analysis of the active deformation mechanisms is a crucial step in clarifying the hardening behavior associated with grain refinement [1,2,[7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Grain refinement of pure Ti during plastic deformation

Fan

Jiang

et al. 2010

Materials Science and Engineering: A

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a b s t r a c tThe mechanism of grain refinement was studied in titanium subjected to high-rate surface mechanical attrition treatment. By cross-sectional transmission electron microscopy, the deformation structures were systematically characterized in a nanocrystalline (NC) layer of the treated surface which exhibits a grain size gradient. The microstructural evolution with increasing strain involves (1) the formation of slip bands with dislocation-free cells in their interiors, (2) nucleation and migration of high-angle grain boundaries at cell boundaries consisting of high-density tangled dislocations, leading to the formation of submicrosized grains inside the slip bands, followed by (3) the formation of subgrains and dislocation cells inside the submicrosized grains with increasing misorientations, which finally become NC grains. The mechanism of grain refinement was interpreted in terms of the classical migration dynamic recrystallization (DRX) and continuous rotation DRX, respectively, leading to submicrosized and NC grains with increasing strains at high strain rates. The cooperative grain boundary sliding is active at high strain rate, by the presence of arrays of coplanar grain boundaries.

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Section: Introductionmentioning

confidence: 99%

Grain refinement of pure Ti during plastic deformation

Fan

Jiang

et al. 2010

Materials Science and Engineering: A

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“…Many previous investigations showed that the grain refinement process during plastic deformation originates from dislocation activity in some metals and alloys such as Fe, 11 Cu, 12,13 Ni, 14,15 an Al-based alloy, 16 and low-carbon steels. 17 Plastic straining induces generation of a high density of lattice dislocations in original grains.…”

Section: Introductionmentioning

confidence: 99%

Grain refinement at the nanoscale via mechanical twinning and dislocation interaction in a nickel-based alloy

et al. 2004

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A nanostructured surface layer was formed on an Inconel 600 plate by subjecting it to surface mechanical attrition treatment at room temperature. Transmission electron microscopy and high-resolution transmission electron microscopy of the treated surface layer were carried out to reveal the underlying grain refinement mechanism. Experimental observations showed that the strain-induced nanocrystallization in the current sample occurred via formation of mechanical microtwins and subsequent interaction of the microtwins with dislocations in the surface layer. The development of high-density dislocation arrays inside the twin-matrix lamellae provides precursors for grain boundaries that subdivide the nanometer-thick lamellae into equiaxed, nanometer-sized grains with random orientations.

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“…For the purpose of improving its mechanical properties and plasticity Al is often alloyed with Mn and Mg and the materials thereof are used for higher levels of deep drawing. The behaviour of these alloys has been investigated by many authors [1][2][3][4][5][6][7][8][9] in order to determine the technological, mechanical, thermal, electro-chemical, etc. properties.…”

Section: Introductionmentioning

confidence: 99%

Peculiar behaviour of pure ENAW-Al99.5 sheet metal during uniaxial tensile test

Yankov

Nikolova

2017

MATEC Web Conf.

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Abstract. Due to the generalized use of aluminium (Al) and Al alloy a detailed investigation of the mechanical and technological behaviour of a wide range of sheet metals is particularly needed. Often during deformation the Al sheets fold or crack which makes their subsequent use harder. The aim of this study is to identify the causes of the changes taking place during deformation that leads to earlier breaks of the Al sheet material. Pure ENAW-Al99.5 in as-received condition is used for examination in order to determine its behaviour without interference of the alloying elements. After the uniaxial uniform tensile test significant differences in the mechanical strength of the samples cut out from the sheet material at three different directions -0°, 45° and 90° angle to the rolling direction are observed. The hardness values measured at three different directions: alongside the long side of the samples, cross-section and top view are compared. The XRD and microstructure analysis confirm the grain and lattice reorientation after the tests compared with the initial structure of the sheet material. These results could be applied as a basis of comparison when examining other Al alloys used in aviation and mechanical engineering, chemical and agro-food industry, etc.

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Microstructure and evolution of mechanically-induced ultrafine grain in surface layer of AL-alloy subjected to USSP

Cited by 444 publications

References 27 publications

Grain refinement of pure Ti during plastic deformation

Grain refinement of pure Ti during plastic deformation

Grain refinement at the nanoscale via mechanical twinning and dislocation interaction in a nickel-based alloy

Peculiar behaviour of pure ENAW-Al99.5 sheet metal during uniaxial tensile test

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