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Accumulative Roll

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Roohollah Jamaati – One of the best experts on this subject based on the ideXlab platform.

Nobuhiro Tsuji – One of the best experts on this subject based on the ideXlab platform.

  • Development of highly cube textured nickel superconductor substrate tapes by Accumulative Roll Bonding (ARB)
    International Journal of Materials Research, 2011
    Co-Authors: Pinaki Prasad Bhattacharjee, Nobuhiro Tsuji
    Abstract:

    Development of cube texture ({001}〈100〉) has been investigated in pure Ni (99.97 %) deformed to ultrahigh straining (e = 6.4) by Accumulative Roll bonding and then annealed at different temperatures for use as coated superconductor substrate. The as Accumulative Roll bonding processed sheets reveal a typical pure metal or copper type homogeneous defodeformation texture. After annealing at different temperatures, strong cube texture formation is observed and a nearly 100% cube textured tape with almost twin-free microstructure is obtained after annealing at 800 °C for 1 h. The development of a sharp cube texture is accompanied by the development of a predominantly low angle boundary network. The very sharp cube texture formation in this material appears to be due to the oriented nucleation of cube grains at early stages of recrystallization and selective growth of these grains with progressing recrystallization. The results obtained indicate that Accumulative Roll bonding could be a very attractive route for fabricating highly cube textured superconductor substrate tapes from Ni.

  • Friction stir welding of ultrafine grained Al alloy 1100 produced by Accumulative Roll-bonding
    Scripta Materialia, 2003
    Co-Authors: Yutaka S. Sato, Y. Kurihara, Seung Hwan C. Park, Hiroyuki Kokawa, Nobuhiro Tsuji
    Abstract:

    Abstract Friction stir welding (FSW) was applied to an Accumulative Roll-bonded (ARBed) Al alloy 1100. FSW resulted in reproduction of fine grains in the stir zone and small growth of the ultrafine grains of the ARBed material just outside the stir zone. Consequently, FSW effectively prevented the softening in the ARBed alloy.

  • microstructural evolution during Accumulative Roll bonding of commercial purity aluminum
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2003
    Co-Authors: Xiaoxu Huang, Nobuhiro Tsuji, N Hansen, Yoritoshi Minamino
    Abstract:

    The microstructure in commercial purity aluminum deformed from medium to high strain (evM=1.6–6.4) by Accumulative Roll-bonding (ARB) at 473 K was quantitatively examined by transmission elecelectron microscopy. It was found that a sub-micrometer lamellar structure characterizes the microstructure at high strains (evM>1.6), and that the lamellar boundary spacing decreases and the misorientation across the lamellar boundaries increases with increasing Rolling strain. This characteristic evolution has also been observed during conventional cold-Rolling of commercial purity aluminum. However, a comparison between the two processes shows a significant difference in the evolution of the microstructural parameters. These differences are discussed based on the different processing conditions characterizing ARB and conventional Rolling, respectively.

Heinz Werner Höppel – One of the best experts on this subject based on the ideXlab platform.

  • A multiscale simulation framework of the Accumulative Roll bonding process accounting for texture evolution
    Materials Science and Engineering: A, 2015
    Co-Authors: Aruna Prakash, Heinz Werner Höppel, Wolfram Georg Nöhring, Ricardo A. Lebensohn, Erik Bitzek
    Abstract:

    The Accumulative Roll bonding process is one of the most prominent severe plastic defodeformation processes for obtaining sheet materials with ultra-fine-grained microstructures and high strength. The properties of such sheets differ significantly from those of conventionally Rolled sheets. It is hence desirable to have a simulation framework that can accurately predict the material properties, including the evolving texture and anisotropy during processing. Here, we propose such a framework for multiple pass Rolling using explicit finite elements and embedding the visco-plastic self-consistent (VPSC) polycrystal texture model for the material response. To facilitate multiple pass Rolling, we propose a novel solution mapping scheme that transfers the material state from the deformed finite element mesh to a new one. Additionally, we implement a two-level parallelization scheme – with decomposition of the FE domain using message passing interface (MPI) and thread based parallelization of the material response using openMP – to ensure reduced simulation times. The predictive capabilities of the proposed framework are demonstrated by simulating the Accumulative Roll bonding of aluminum alloy AA5754 sheets. The simulations validate the working of the solution mapping scheme, and clearly show the development of a through thickness gradient of texture and anisotropy in the Roll-bonded sheet after two passes.

  • Influence of upscaling Accumulative Roll bonding on the homogeneity and mechanical properties of AA1050A
    Journal of Materials Science, 2013
    Co-Authors: M. Ruppert, Heinz Werner Höppel, W. Böhm, H. Nguyen, M. Merklein, Mathias Göken
    Abstract:

    Accumulative Roll bonding (ARB), as a method for production of ultrafine grained materials, is frequently supposed to be easily transferable to established industrial production lines. In literature, however, common sheet dimensions used for ARB in a laboratory scale are between 20 and 100 mm in width. In order to quantify the potential of upscaling the ARB process to a technological relevant level, sheets of AA1050A with an initial sheet width of 100–450 mm were Accumulative Roll bonded up to 8 cycles. In this regard, three different Rolling mills of distinct dimensions were used for processing of the sheet material. The influence of process parameters and the reproducibility of the process, in terms of mechanical properties and homogeneity of the sheets, were studied by means of mechanical and microstructural characterization. Both appear to be largely independent on the sheet size and the Rolling mill utilized for production. Only small deviations after the first cycles could be detected, vanishing in subsequent cycles due to the features of microstructural evolution. The finally obtained results indicate a high potential for industrial application of ARB and illustrate the possibility to upscale the process to a level necessary for that purpose.

  • Mechanical properties of aluminium laminates produced by Accumulative Roll bonding: Mechanical properties of aluminium laminates produced by Accumulative Roll bonding
    Crystal Research and Technology, 2013
    Co-Authors: Paul Chekhonin, Tina Hausöl, Heinz Werner Höppel, Juliane Scharnweber, M. Scharnweber, Carl-georg Oertel, J. Jaschinski, T. Marr, Werner Skrotzki
    Abstract:

    Laminates of high and commercial purity aluminium layers were processed by Accumulative Roll bonding performed up to ten cycles. The mechanical properties were measured by tensile testing. Both yield strength and ultimate tensile strength increase with higher number of cycles. The fracture strain is decreased through the first ARB cycle, but increases during further processing to reach a maximum after the sixth cycle. It is found that the development of the microstructure, especially in the high purity layers, strongly influences the mechanical properties.

Oscar Antonio Ruano – One of the best experts on this subject based on the ideXlab platform.

  • Bond Strength of Ultrafine Grained Zr Fabricated by Accumulative Roll Bonding
    Materials Science Forum, 2008
    Co-Authors: Ling Jiang, Oscar Antonio Ruano, Maria Teresa Pérez-prado, Michael E. Kassner
    Abstract:

    The bond strength of ultrafine grained Zr with a grain size of 0.4 µm, fabricated by Accumulative Roll bonding (ARB), was assessed. The shear strength of the bond was estimated to be about 20% of the shear fracture strength of the as processed metal, a ratio significantly higher than that found in other materials processed by similar methods. The favorable degree of bonding achieved is attributed to the high ductility of Zr as well as to the high reductions used during the ARB process.

  • The fabrication of bulk ultrafine-grained zirconium by Accumulative Roll bonding
    JOM, 2007
    Co-Authors: Ling Jiang, Oscar Antonio Ruano, Michael E. Kassner, Maria Teresa Pérez-prado
    Abstract:

    This work demonstrates that bulk ultrafine-grained zirconium can be fabricated by Accumulative Roll bonding. Grain refinement takes place by geometrical thinning and grain subdivision through the formation of geometrically necessary boundaries. This is consistent with the stabilization of a typical Rolling texture during processing and with the absence of any recrystallization texture components. The ultrafine-grained zirconium possesses high ultimate tensile strength, good ductility, and a remarkable strain hardening capacity.

  • Accumulative Roll bonding of a Mg-based AZ61 alloy
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2005
    Co-Authors: J A Del Valle, Maria Teresa Pérez-prado, Oscar Antonio Ruano
    Abstract:

    Abstract This work aims to investigate whether Accumulative Roll bonding (ARB) is an effective grain refinement technique for the Mg–Al alloy AZ61. Thus, a number of ARB routes at 300 °C and 400 °C, using thickness reductions per pass of 25%, 50%, 66%, and 80%, were performed. It was found that both the ultimate grain size achieved, as well as the degree of bonding, depend on the Rolling temperature and on the thickness reduction per pass. Higher temperatures and higher reductions promote a larger degree of bonding. Increasing strain also favors the formation of a more homogeneous microstructure. The smallest grain sizes were obtained at the lowest Rolling temperature.

John G. Lenard – One of the best experts on this subject based on the ideXlab platform.

  • Severe Plastic Deformation — Accumulative Roll Bonding
    Primer on Flat Rolling, 2014
    Co-Authors: John G. Lenard
    Abstract:

    The interest in bulk nanostructured materials, processed by the methods of severe plastic defodeformation, is justified by the unique physical and mechanical properties of the resulting products. The advantage of these over other processes is related to overcoming the difficulties connected to residual poroporosity in compacted samples, impurities from ball milling, processing of large-scale billets, and the practical application of the resulting materials. The methods of severe plastic defodeformation create ultrafine-grained structures with prevailing high-angle grain boundaries. They should also be able to create uniform nanostructures within the whole volume of a sample to provide stable properties of the processed materials, and they should not suffer mechanical damage when exposed to large plastic deformations. This chapter presents a discussion of processes that apply severe plastic defodeformation to create small grains, thereby increase their strength. It describes the method of Accumulative Roll bonding. This chapter discusses this mehtod, followed by a detailed discussion of a set of experiments related to it. It also discusses the potential industrial application of the Accumulative Roll bonding process and the creation of tailor-Rolled blanks.

  • Chapter 8 – Severe Plastic Deformation — Accumulative Roll Bonding
    Primer on Flat Rolling, 2007
    Co-Authors: John G. Lenard
    Abstract:

    Publisher Summary The interest in bulk nanostructured materials, processed by the methods of severe plastic defodeformation, is justified by the unique physical and mechanical properties of the resulting products. The advantage of these over other processes is related to overcoming the difficulties connected to residual poroporosity in compacted samples, impurities from ball milling, processing of large-scale billets, and the practical application of the resulting materials. The methods of severe plastic defodeformation create ultrafine-grained structures with prevailing high-angle grain boundaries. They should also be able to create uniform nanostructures within the whole volume of a sample to provide stable properties of the processed materials, and they should not suffer mechanical damage when exposed to large plastic deformations. This chapter presents a discussion of processes that apply severe plastic defodeformation to create small grains, thereby increase their strength. It describes the method of Accumulative Roll bonding. This chapter discusses this mehtod, followed by a detailed discussion of a set of experiments related to it. It also discusses the potential industrial application of the Accumulative Roll bonding process and the creation of tailor-Rolled blanks.

  • An examination of the Accumulative Roll-bonding process
    Journal of Materials Processing Technology, 2004
    Co-Authors: György Krállics, John G. Lenard
    Abstract:

    Abstract Ultra-low-carbon steel strips containing 0.002% C were Rolled at 500 °C, following the steps of the Accumulative Rollbonding process. Strips of 32 layers were created. The mechanical attributes after Rolling and cooling were examined and the development of edge cracking was monitored. The metal’s yield and tensile strengths increased by 200–300% while the ductility dropped from a pre-Rolled value of 75 to 4%. The Rolling process was stopped when cracking of the edges became pronounced. The shear strength of the bond was about 60% of the yield strength in shear. The accumulation of the retained strain after dynamic recovery caused cracking at the edges. A potential industrial application of the Accumulative Rollbonding process, that of the creation of tailored blanks, is discussed.