Advanced Engineering Materials

Cover image for Advanced Engineering Materials

November, 2004

Volume 6, Issue 11

Pages 853–918

    1. Substructure Analysis in Heavily Deformed Materialsby Diffraction Methods (pages 861–871)

      P. Klimanek, V. Klemm, M. Motylenko and A. E. Romanov

      Version of Record online: 9 DEC 2004 | DOI: 10.1002/adem.200400125

      Plastic deformation of metallic materials up to large strains is, in many cases, characterised by the activation of different deformation modes and the formation of complicated, locally inhomogeneous substructures, which give rise to both significant lattice strains and rotations. A suitable tool for the investigation of the microstructures is a combination of diffraction techniques as, for instance, electron microscopy (TEM; EBSD) and X-ray diffractometry. In order to demonstrate the potential of the diffraction analysis the following procedures are considered: Evaluation of radial and azimuthal broadening of X-ray diffraction peaks, EBSD analysis of block structures, and TEM identification of disclination arrangements in compressed Fe–Si and Ni single crystals.

    2. Learning with METIS: An Interactive Learning Software for Materials Science (pages 873–876)

      M. Büscher and G. Gottstein

      Version of Record online: 9 DEC 2004 | DOI: 10.1002/adem.200400122

      METIS – a multimedia learning environment for materials science is presented. It comprises simulations with free adjustable parameters and is available on the www. This e-learning tool is intended to facilitate an understanding of complex microstructural phenomena by visualization of microstructural evolution and its relation to properties.

    3. Significant Improvement in Room Temperature Ductility of NiAl by Cr-Ce Complexes (pages 876–879)

      W. Chen, J.R. Hines and Y. Wang

      Version of Record online: 9 DEC 2004 | DOI: 10.1002/adem.200400095

      Significant improvement in room temperature ductility of the conventionally cast NiAl alloy was achieved by adding less than 3 at% of Cr and a trace amount of Ce. This improvement has also accompanied with a minor reduction in strength. It was found that the solubility of both the Cr and Ce was increased by their co-presence in NiAl, which was believed to be a result of forming Cr-Ce complexes in NiAl.

    4. Extension of the Performance of Aluminium-Copper Alloys by Spray Forming (pages 879–883)

      K. Schimanski, A. Schulz, H. Vetter, K. Bauckhage and P. Mayr

      Version of Record online: 9 DEC 2004 | DOI: 10.1002/adem.200300506

      Spray formed binary alloys AlCu10, AlCu17 and AlCu24 have been investigated in view of their density, microstructure and forming performance. The forming properties have been determined by means of plasto-dilatometry. With higher copper contents the resistance against deformation increases, but sufficient deformation at elevated temperatures is still possible. Microstructural investigations explain the dependence of the deformation resistance upon the degree of dispersion of the Al2Cu-phase.

    5. Micro-Strain Induced by Thermal Cycling in Short Fiber Reinforced AlSi12CuMgNi Piston Alloy and AE42 Magnesium Alloy (pages 883–888)

      Y. Huang, N. Hort, H. Dieringa and K.U. Kainer

      Version of Record online: 9 DEC 2004 | DOI: 10.1002/adem.200400057

      The thermal strain evolution of the short fiber reinforced AlSi12CuMgNi piston alloy and AE42 magnesium alloy was investigated during thermal cycling. Effects of reinforcement, fiber orientation, thermal cycle and heat treatment on thermal strain were discussed. The addition of the Saffil® short fibers is more effective in improving the dimensional stability of the magnesium alloy.

    6. New type of Pb-free Machinable Soft-Magnetic Stainless Steels with Dispersed Titanium Carbo-Sulfide (pages 889–893)

      T. Ebata, T. Takiguchi, T. Shimizu, K. Oikawa, H. Mitsui and K. Ishida

      Version of Record online: 9 DEC 2004 | DOI: 10.1002/adem.200400047

      Although conventional free-cutting soft-magnetic stainless steel contains Pb to facilitate machining, the replacement and elimination of Pb is required from the standpoint of environmental protection. In this article, the authors report the development of new Pb-free machinable soft-magnetic stainless steels in which titanium carbo-sulfide is used as an inclusion. The microstructural evolution, magnetic properties, corrosion resistance, machinability and mechanical properties of these new free-cutting stainless steels are presented.

    7. The new easyFoam-Process and Mechanical Properties of Foam-Coating-Sandwiches (pages 893–896)

      M. Maurer, L. Zhao and E. Lugscheider

      Version of Record online: 9 DEC 2004 | DOI: 10.1002/adem.200300523

      Coated aluminium foams were heat treated. The influence on the mechanical properties was investigated. In order to produce cost-efficient foam sandwiches, the foaming and coating processes were modified and the new easyFoam-process was developed. It consists of coating foamable semi-finished parts before inductive foaming. This process allows a fast and continuous production of long foam sandwiches. No expensive moulds are needed.

    8. Meso/Macroporous Carbon Monoliths from Polymeric Foams (pages 897–899)

      S. Alvarez, J. Esquena, C. Solans and A.B. Fuertes

      Version of Record online: 9 DEC 2004 | DOI: 10.1002/adem.200400109

      The authors present a novel route for the preparation of monolithic carbons with a meso/macroporous structure by templating mesostructured silica monoliths prepared by using macroporous polystyrene foams as structure scaffolds. The carbon skeletal of these materials shows a well-developed and well-structured porosity made up of mesopores and a very large surface area and a high pore volume.

    9. Laminated Object Manufacturing (LOM) of SiSiC Composites (pages 899–903)

      L. Weisensel, N. Travitzky, H. Sieber and P. Greil

      Version of Record online: 9 DEC 2004 | DOI: 10.1002/adem.200400112

      Carbon templates of laminar structure were manufactured from pyrolysed filter paper sheets by Laminated Object Manufacturing (LOM). The laminates were converted into SiSiC composites by post-pressureless reactive Si-infiltration. The microstructure and mechanical properties of the fabricated materials depends on the density, porosity and pore size distribution of the biocarbon preform, which can be varied by changing the parameters of the LOM-processing.

    10. Effect of the Composition on the Structure of Cr-Al-C Investigated by Combinatorial Thin Film Synthesis and ab Initio Calculations (pages 903–907)

      R. Mertens, Z. Sun, D. Music and J.M. Schneider

      Version of Record online: 9 DEC 2004 | DOI: 10.1002/adem.200400096

      The effect of the chemical composition on the structure of Cr-Al-C was studied by combinatorial thin film synthesis. By changing the Cr/C ratio from 1.72 to 3.48 and the Cr/Al ratio from 1.42 to 4.18 the formation of Cr2AlC, Cr2Al and Cr23C6 phases was observed. Furthermore, based on X-ray diffraction a single phase Cr2AlC composition region is identified in the Cr-Al-C phase diagram. Throughout the studied composition range the lattice parameters of Cr2AlC were independent of the chemical composition.

    11. Experimental Design to Study the Effect of APS Process Parameters on Friction Behaviour of Alumina-Titania Coatings (pages 907–910)

      S. Guessasma and M. Bounazef

      Version of Record online: 9 DEC 2004 | DOI: 10.1002/adem.200400051

      A factorial design was considered to study the effect of APS energetic and injection parameters on friction coefficient of alumina – titania coating. A first analysis suggested that wear resistance improvement was related to those conditions decreasing spray temperature and increasing in-flight powder particle velocity before substrate impingement.

    12. Oxidation Protective Glass-Ceramic Coating for SiC Fibre Reinforced Glass Matrix Composites (pages 910–914)

      M. Ferraris, M. Salvo, I. Matekovits and A.R. Boccaccini

      Version of Record online: 9 DEC 2004 | DOI: 10.1002/adem.200400106

      A protective coating for SiC fiber reinforced borosilicate glass-matrix composites based on zinc borosilicate (ZBS) glass-ceramic was developed. The coating was deposited on the composite surfaces by a simple and cost-effective method, based on slurry dipping followed by a densification and crystallisation stage carried out at optimised temperature and holding time. The coatings were shown to be able to withstand temperatures of up to 700 °C without softening and without exhibiting microcracking.

    13. Residual Stresses and Stress Intensity Factors for Vickers Indentation Cracks in Glass Derived from COD Measurements (pages 914–918)

      T. Fett, Z. Burghard, A. Zimmermann and F. Aldinger

      Version of Record online: 9 DEC 2004 | DOI: 10.1002/adem.200400121

      Vickers indentation cracks are an appropriate tool to determine the crack-tip toughness KI0 of brittle materials as ceramics from the total crack opening displacements. In addition, the residual stresses occurring in the surrounding of an indentation can be evaluated. The fracture mechanics procedure is described in detail and applied to indentation cracks in glass.

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