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  • 1.
    Akhtar, Farid
    et al.
    Institute of Powder Metallurgy, Materials Science Department, University of Science and Technology Beijing.
    Guo, Shiju
    Institute of Powder Metallurgy, Materials Science Department, University of Science and Technology Beijing.
    Cui, Feng-e
    Institute of Powder Metallurgy, Materials Science Department, University of Science and Technology Beijing.
    Feng, Peizhong
    Institute of Powder Metallurgy, Materials Science Department, University of Science and Technology Beijing.
    Lin, Tao
    Institute of Powder Metallurgy, Materials Science Department, University of Science and Technology Beijing.
    TiB 2 and TiC stainless steel matrix composites2007Inngår i: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 61, nr 1, s. 189-191Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Stainless steel matrix composites reinforced with TiB2 or TiC particulates have been in situ produced through the reactive sintering of Ti, C and FeB. X-ray diffraction analysis confirmed the completion of reaction. The TiB2, TiC and steel were detected by X-ray diffraction analysis. No other reaction product or boride was found, indicating the stability of TiB2 and TiC in steel matrix. The SEM micrographs revealed the morphology and distribution of in situ synthesized TiB2 and TiC reinforcements in steel matrix. During sintering the reinforcements TiB2 and TiC grew in different shapes. TiB2 grew in hexagonal prismatic and rectangular shape and TiC in spherical shape.

  • 2.
    Akhtar, Farid
    et al.
    Department of Metallurgical and Materials Engineering, University of Engineering and Technology, Lahore.
    Hasan, Faizul
    Department of Metallurgical and Materials Engineering, University of Engineering and Technology, Lahore.
    Reactive sintering and properties of TiB 2 and TiC porous cermets2008Inngår i: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 62, nr 8-9, s. 1242-1245Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    TiB2, TiC reinforced Fe matrix porous cermets were produced through the synthesis reaction of Ti, C and FeB powders with 30% sintered porosity. The X-ray diffraction analysis confirmed the completion of reaction. The TiB2, TiC and Fe were detected by X-ray diffraction analysis. The formation of secondary reaction products was inhibited during the reactive sintering. Porous cermets showed large and small pores in their structure. Maximum bending strength of 163 MPa was obtained with 30% sintered porosity. Furthermore, the fabricated samples were found to possess reasonable electrical conductivities, thus rendering them suitable for use as the basic components of planar solid oxide fuel cells.

  • 3.
    Askari, SJ
    et al.
    Department of High Tech Thin Films, School of Materials Science and Engineering, University of Science and Technology Beijing.
    Akhtar, Farid
    Department of High Tech Thin Films, School of Materials Science and Engineering, University of Science and Technology Beijing.
    Chen, GC
    Department of High Tech Thin Films, School of Materials Science and Engineering, University of Science and Technology Beijing.
    He, Q
    Department of High Tech Thin Films, School of Materials Science and Engineering, University of Science and Technology Beijing.
    Wang, FY
    Department of High Tech Thin Films, School of Materials Science and Engineering, University of Science and Technology Beijing.
    Meng, XM
    Department of High Tech Thin Films, School of Materials Science and Engineering, University of Science and Technology Beijing.
    Lu, FX
    Department of High Tech Thin Films, School of Materials Science and Engineering, University of Science and Technology Beijing.
    Synthesis and characterization of nano-crystalline CVD diamond film on pure titanium using Ar/CH 4/H 2 gas mixture2007Inngår i: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 61, nr 11-12, s. 2139-2142Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Titanium and Ti alloys have poor tribological properties and deposition of a well adherent diamond coating is a promising way to solve this problem. But diamond film deposition on pure titanium and Ti alloys is always difficult due to the high diffusion coefficient of carbon in Ti, the large mismatch in their thermal expansion coefficients, the complex nature of the interlayer formed during diamond deposition, and the difficulty of achieving very high nucleation density. A nano-crystalline diamond (NCD) film can resolve Ti and Ti alloys weak tribological performance due to its smooth surface. A well-adhered NCD film was successfully deposited on pure Ti substrate by using a microwave plasma assisted chemical vapor deposition (MWPCVD) system in the environment of Ar, CH4 and H2 gases at a moderate temperature. Detailed experimental results on the preparation, characterization and successful deposition of the NCD film on pure Ti are discussed

  • 4.
    Davoodi, M.M.
    et al.
    Department of Mechanical and Manufacturing Engineering, Universiti Putra Malaysia.
    Sapuan, S.M.
    Department of Mechanical and Manufacturing Engineering, Universiti Putra Malaysia.
    Ahmad, D.
    Department of Biological and Agricultural Engineering, Universiti Putra Malaysia.
    Aidy, A.
    Department of Mechanical and Manufacturing Engineering, Universiti Putra Malaysia.
    Khalina, A.
    Department of Biological and Agricultural Engineering, Universiti Putra Malaysia.
    Jonoobi, Mehdi
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Effect of polybutylene terephthalate (PBT) on impact property improvement of hybrid kenaf/glass epoxy composite2012Inngår i: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 67, nr 1, s. 5-7Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Environmental regulations, costs and lightweight encourage car manufacturers to develop new reliable products. Epoxy provides a reliable fibre impregnation and creates substantial three-dimensional (3D) cross-linking for proper load transmission and impact strength improvement, but their low toughness decreases their energy absorption. Thermoplastic toughening improves the epoxy impact property with a low thermo-mechanical defect. This study, focused on improving the impact property of hybrid kenaf/glass fibre epoxy composite by use of a modified sheet moulding compound (GMT). The results indicated that most of the mechanical properties of developed material were almost the same as those of the GMT, except impact. This result highlights the potential for utilisation of the toughened hybrid bio-composite in some automotive structural components. Moreover, geometric parameters, e.g., cross-section, thickness, and reinforcement ribs suggest an improvement of structural impact resistance to comply with the bumper beam product design specification (PDS).

  • 5.
    Engström, Andreas
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Matematiska vetenskaper.
    Mouzon, Johanne
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriell miljö- och processteknik.
    Córdoba, J.M.
    Instituto de Ciencia de Materiales de Sevilla, Código del Centro.
    Tegman, Ragnar
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Antti, Marta-Lena
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Synthesis of a TiCN – SiC polyhedron and elongated crystals nanopowder at low nitrogen concentration2012Inngår i: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 81, s. 148-150Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    At room temperature diluted TiCl4 and CCl4 were reduced by sodium particles and mixed with a polycarbomethylsilane (PCS) solution to yield a precursor. It was dried and subsequently annealed at 1300 °C, 1400 °C and 1450 °C in a tube furnace using argon with 10 ppm N2. After the 1450 °C annealing a nanocrystalline powder of TiC0.5 N0.5–SiC polyhedron and elongated crystals was obtained. At the low nitrogen concentration during annealing a gradual nitration is proposed. It is promoted by carbon gaseous species, precursor oxidation, a sufficient temperature and a summarised nitrogen surplus compared to the titanium and carbon amount.

  • 6. Hedström, Peter
    et al.
    Lienert, Ulrich
    Argonne National Laboratory, Argonne, IL.
    Almer, Jon
    Argonne National Laboratory, Argonne, IL.
    Odén, Magnus
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Elastic strain evolution and ε-martensite formation in individual austenite grains during in situ loading of a metastable stainless steel2008Inngår i: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 62, nr 2, s. 338-340Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The (hcp) ε-martensite formation and the elastic strain evolution of individual (fcc) austenite grains in metastable austenitic stainless steel AISI 301 has been investigated during in situ tensile loading up to 5% applied strain. The experiment was conducted using high-energy X-rays and the 3DXRD technique, enabling studies of individual grains embedded in the bulk of the steel. Out of the 47 probed austenite grains, one could be coupled with the formation of ε-martensite, using the reported orientation relationship between the two phases. The formation of ε-martensite occurred in the austenite grain with the highest Schmid factor for the active {111}b12¯1N slip system.

  • 7.
    Herrera, Martha
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Mathew, Aji P.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Oksman, Kristiina
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Comparison of cellulose nanowhiskers extracted from industrial bio-residue and commercial microcrystalline cellulose2012Inngår i: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 71, nr 1, s. 28-31Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The aim of this work was to compare the physical and chemical properties of cellulose nanowhiskers extracted from industrial bio-residue (CNW-BR) by homogenization, and microcrystalline cellulose (CNW-MCC) by acid hydrolysis. CNW-MCC showed a higher surface charge than CNW-BR when analyzed using conductometric titration. Both CNW-suspensions showed flow birefringence, indicating the presence of individualized whiskers. Morphology study confirmed that the whisker diameters were less than 10 nm for both materials, and atomic force microscope images showed somewhat more aggregated BR nanowhiskers. UV/Vis spectroscopy of the CNW-films showed transparency in visual light. The relative crystallinity obtained from X-ray diffraction was 77% for the CNW-BR, and 85% for the CNW-MCC. It was demonstrated, by thermal analysis, that the CNW-BR was more thermally stable than the CNW-MCC, having a higher degradation onset temperature (218 °C and 155 °C) as well as maximum degradation temperature.

  • 8.
    Hossain, SK Saddam
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Akhtar, Farid
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Fabrication of lightweight ceramics of complex geometries in freezing weather2024Inngår i: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 368, artikkel-id 136633Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A stable aqueous-based alumina slurry (16 vol%) was formulated and frozen at −10 to −25 °C in natural freezing environment. The thermally treated ceramic monoliths achieved ∼82–88 vol% porosity with short-range aligned pores. Finally, the unidirectional pores in the structure are achieved using a mold with thermal insulation properties. Natural freezing saves 300 kJ of energy per kg of alumina slurry. Mechanically stable lightweight porous ceramics with complex geometries can be designed without cryogenic fluids, refrigeration, or thermal baths. Implementing natural freezing in the porous ceramics industries, particularly in the Arctic region, will bring forward a sustainable approach by reducing energy consumption and CO2 emissions.

    Fulltekst (pdf)
    fulltext
  • 9.
    Jiao, Xinjang
    et al.
    School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
    Wang, Xiaohong
    School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
    Kang, Xueqin
    School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
    Feng, Peizhong
    School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
    Zhang, Laiqi
    School of Materials Science and Engineering, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing.
    Wang, Jianzhong
    State Key Laboratory of Porous Metal Materials, Northwest Institute for Non-ferrous Metal Research, Xi’an.
    Akhtar, Farid
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Hierarchical porous TiAl3 intermetallics synthesized by thermal explosion with a leachable space-holder material2016Inngår i: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 181, s. 261-264Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Porous TiAl3 intermetallics were synthesized by thermal explosion (TE) reaction with NaCl as space holder material, from Ti-75Al at.% elemental powders. Results showed that the actual temperature of specimen climbed rapidly from 667 °C to 1106 °C. As a consequence, porous TiAl3 intermetallics with high open porosity (>80%) can be easily achieved when adding NaCl particles above 50 vol%. XRD patterns showed that only single-phase TiAl3 compound was synthesized via TE. Hierarchical porous TiAl3 materials displayed three pore structures, including large pores replicating from original NaCl particles, small pores among the skeletons, and tiny pores precipitated from particle skeletons. Moreover, porous TiAl3 intermetallics exhibited a uniform pore size distribution and formed an open-cellular structures allowing for the liquid-gas separation and filtration applications

  • 10. Mathew, Aji P.
    et al.
    Thomas, Sabu
    Izod impact behavior of natural rubber/polystyrene interpenetrating polymer networks2001Inngår i: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 50, nr 2-3, s. 154-163Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The impact behavior of semi and full interpenetrating polymer networks based on natural rubber (NR) and polystyrene (PS) has been studied with special reference to blend ratio and cross-linking level of PS phase. As the PS cross-linker level increases up to 4% an increase in impact strength values was observed. This behavior was explained based on blend morphology and the fractography. It was also found that in moderately cross-linked IPNs, the blend composition with 70% PS showed maximum impact strength values. At higher cross-linking levels, samples with 60% PS showed maximum impact strength values. The fracture surface morphology satisfactorily explained the nature of failure and impact performance in all cases. Addition of NR to PS has changed the failure mechanism from crazing to shear yielding

  • 11.
    Sheydaeian, Esmat
    et al.
    University of Toronto, Toronto, Canada.
    Gerdt, Leonid
    Fraunhofer IWS, Dresden, Germany.
    Stepien, Lukas
    Fraunhofer IWS, Dresden, Germany.
    Lopez, Elena
    Fraunhofer IWS, Dresden, Germany.
    Brückner, Frank
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling. Fraunhofer IWS, Dresden, Germany.
    Leyens, Christoph
    Fraunhofer IWS, Dresden, Germany; Dresden University of Technology, Germany.
    PBF-LB of zinc composites modified with nanopowders: Initial insights into powder and part characterizations2024Inngår i: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 361, artikkel-id 136076Artikkel i tidsskrift (Fagfellevurdert)
  • 12.
    Tian, Jianjun
    et al.
    Institute of Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology, Beijing.
    Qu, Xuanhui
    Institute of Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology, Beijing.
    Zhang, Shengen
    Institute of Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology, Beijing.
    Cui, Dawei
    Institute of Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology, Beijing.
    Akhtar, Farid
    Institute of Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology, Beijing.
    Magnetic properties and microstructure of radially oriented Sm (Co, Fe, Cu, Zr) z ring magnets2007Inngår i: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 61, nr 30, s. 5271-5274Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Radially oriented Sm(Co,Fe,Cu,Zr)z ring magnets are prepared by powder metallurgy with appropriate magnetic field molding, sintering process and aging treatment. The results indicate that radially oriented Sm(Co,Fe,Cu,Zr)z ring magnets have obvious anisotropy of thermal expansion and sintering shrinkage, which easily lead to the splits and deformation of the ring magnets. So, slow heating, vacuum pre-sintering in sintering process and various quenching processes at different steps during quenching are adopted. The magnets have excellent magnetic properties: Br = 10.8 kGs, Hcj = 27.6 kOe, BHmax = 28.1 MGOe. Besides, there is a uniform magnetization field on the surface of the ring magnets. The average surface magnetization field (View the MathML sourceBs―) is 1.502 kGs. The deviation from average (α) is only 4.2%. The microstructure of the magnets consists of a mixture of homogeneous cellular and lamella structures.

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