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  • 1
    Electronic Resource
    Electronic Resource
    Nonword Repetition as a Behavioural Marker for Inherited Language Impairment: Evidence From a Twin Study (1996)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of child psychology and psychiatry 37 (1996), S. 0 
    Details
    ISSN: 1469-7610
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Psychology
    Notes: The Children's Nonword Repetition Test (CNRep) was given to 39 children with persistent language impairment (LI), 13 with a history of having received speech-language therapy (resolved LI), and 79 controls, all aged from 7 to 9 years. The children with LI were twins who had participated in a previous genetic study. Children with resolved LI, as well as those with persistent LI. were significantly impaired on the CNRep. Comparisons of MZ and DZ twins indicated significant heritability of a CNRep deficit. It is concluded that CNRep provides a marker of the phenotype of heritable forms of developmental language impairment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1469-7610.1996.tb01420.x
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  • 2
    Electronic Resource
    Electronic Resource
    The mechanical properties of friction welded aluminium-based metal–matrix composite materials (1997)
    Springer
    Journal of materials science 32 (1997), S. 3883-3889 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The optimum joining parameters for the friction joining of aluminium-based metal–matrix composite (MMC) materials are examined. The properties of MMC/MMC, MMC/alloy 6061 and alloy 6061/alloy 6061 joints are derived following detailed factorial experimentation. The mechanical properties of the joints are evaluated using a combination of notch tensile testing and also conventional tensile and fatigue testing. The frictional pressure has a statistically-significant effect on the notch tensile strength of joints produced in all base material combinations. The upset pressure has only a statistically-significant influence on the notch tensile strength properties of alloy 6061/alloy 6061 joints. The notch tensile strengths of MMC/alloy 6061 joints are significantly lower than MMC/MMC and alloy 6061/alloy 6061 joints for all joining parameter settings. The fatigue strength of MMC/MMC joints and alloy 6061/6061 joints are also poorer than the as-received base materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018652429477
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  • 3
    Electronic Resource
    Electronic Resource
    Improved mechanical properties in dissimilar Ti-AISI 304L joints (1996)
    Springer
    Journal of materials science 31 (1996), S. 819-827 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effect of low temperature post weld heat treatment on the tensile strength and bend test properties of dissimilar friction welds between titanium and AISI 304L stainless steel joints is investigated. Post weld heat treatment at temperatures less than 873 K has no effect on joint tensile strength properties, but markedly improves bend test properties. The highest bend angle is produced using a post-weld heat treatment at 773 K for 1 h (the Larson-Miller parameter corresponding to this treatment is 15.5×103 K h−1). Low temperature heat treatment improves bend ductility, because stress relaxation occurs with minimal increase in the transition region width at the bondline region. Dissimilar joint bend testing properties decrease markedly when the width of the transition region exceeds 1–2 μm. An explanation for the detrimental effect of thick transition regions at the joint interface region on the mechanical properties of dissimilar joints is proposed. It is suggested that the development of significant triaxial stress due to the constraint imposed by large, needle-shaped intermetallic particles promotes premature joint failure in joints containing thick transition regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00367903
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  • 4
    Electronic Resource
    Electronic Resource
    Particle fracture in metal-matrix composite friction joints (1997)
    Springer
    Journal of materials science 32 (1997), S. 4739-4748 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influence of welding parameters, reinforcing particle chemistry and shape, matrix condition and silver interlayers on particle fracture during similar and dissimilar friction welding of aluminium-based metal-matrix composite (MMC) base material was investigated. Two composite base materials were examined, one containing Al2O3 particles and the other containing 72 wt% Al2O3–7 wt% Fe2O3–17 wt% SiO2–3 wt% TiO2 particles. The different material combinations comprised MMC/MMC, MMC/alloy 6061, MMC/AISI 304 stainless steel and MMC/1020 mild steel joints. Particle fracture was confined to a narrow region immediately adjacent to the dissimilar joint interface. The calculated normal pressure for fracture of Al2O3 particles ranges from 0.56–17.58 MPa and is in agreement with an experimentally measured pressure of 1.06 MPa found during sliding wear testing of aluminium-based composite base material. Because the lowest normal pressure applied during friction joining was 30 MPa, particle fracture occurs very early in the joining operation (immediately following contact between the two substrates). The application of a silver interlayer during dissimilar MMC/AISI 304 stainless steel joining decreased the particle fracture tendency. It is suggested that the presence of a silver interlayer decreased the coefficient of friction and lowered the stresses applied at the contact region. The particle fracture tendency was markedly increased when the MMC material contained blocky alumina particles. However, there was negligible particle fracture when the MMC base material contained spherical 72 wt% Al2O3–7 wt% Fe2O3–17 wt% SiO2–3 wt% TiO2 particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018626929844
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  • 5
    Electronic Resource
    Electronic Resource
    Microstructural features of dissimilar MMC/AISI 304 stainless steel friction joints (1996)
    Springer
    Journal of materials science 31 (1996), S. 3667-3674 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The microstructure and mechanical properties of dissimilar friction joints between aluminium-based MMC and AISI 304 stainless steel base materials were investigated. The microstructural features which occur in the stainless steel substrate comprise deformation twinning, formation of a fine-grained dislocation substructure in austenite, and plastic deformation. The stainless steel substrate was plastically deformed in the region close to the mid-radius of the dissimilar joint. In a similar manner, 5–10 μm thick transition layers, comprising regions of locally plasticized MMC-base material, were formed close to the mid-radius location in dissimilar joints. The interlayer formed at the dissimilar joint interface comprised a mixture of oxide (Fe(Al,Cr)2O4 or FeO(Al,Cr)2O3) and FeAl3 intermetallic phases. The notch tensile strength of dissimilar MMC/AISI 304 stainless steel joints increased when the rotational speed increased from 500 r.p.m. to 1000 r.p.m., and at higher rotation speeds, there was no effect on notch tensile strength properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00352777
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  • 6
    Electronic Resource
    Electronic Resource
    Counteracting particulate segregation during transient liquid-phase bonding of MMC–MMC and Al2O3–MMC joints (1997)
    Springer
    Journal of materials science 32 (1997), S. 5571-5575 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The microstructure and mechanical properties of MMC–MMC and Al2O3–MMC joints (MMC is metal matrix composits) produced at a bonding temperature of 853 K using copper foils ranging in thickness from 10 to 30 μm were examined. The particle segregation tendency during transient liquid-phase (TLP) bonding of aluminium-based MMC material markedly increases when the aluminium-based composite material contains large number of small radius (less than 10 μm) reinforcing particles. Also, the particle segregation tendency is much greater in dissimilar Al2O3–MMC joining since the rate of solid–liquid interface movement is much slower and the time required for completing the isothermal solidification during TLP bonding is much longer. The particle segregation tendency during MMC–MMC and Al2O3–MMC bonding can be counteracted using a combination of a short (1 min) holding time at the bonding temperature (853 K) and subsequent post-weld heat treatment at 773 K for 4 h. This TLP-bonding–heat-treatment cycle removes the retained eutectic phase present at the joint centreline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018624507922
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  • 7
    Electronic Resource
    Electronic Resource
    The influence of base metal grain size on isothermal solidification during transient liquid-phase brazing of nickel (1993)
    Springer
    Journal of materials science 28 (1993), S. 6427-6432 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influence of base metal grain size on isothermal solidification during transient liquid-phase brazing with Ni-11 wt% P filler metal has been investigated. Single-crystal, coarse-grained and fine-grained nickel base metal were brazed at 1150
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01352207
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  • 8
    Electronic Resource
    Electronic Resource
    Influence of silicon in aluminium on the mechanical properties of titanium/aluminium friction joints (1995)
    Springer
    Journal of materials science 30 (1995), S. 5185-5191 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influence of post-weld heat-treatment and of residual silicon in aluminium on the mechanical properties of dissimilar friction joints between titanium and aluminium was investigated. Although joint tensile strength and bend test properties were drastically reduced following post-weld heat treatment, the responses of Ti/h.p. Al and Ti/c.p. Al joints were quite different. The tensile strength and bend test properties of Ti/h.p. Al joints were markedly decreased by heat-treatments involving shorter holding times at lower temperatures. Joint failure in post-weld heat-treated joints was associated with Al3Ti formation at the bondline region. The growth rate of the Al3Ti intermetallic layer at the joint interface was much faster in post weld heat-treated Ti/h.p. joints. More than 20 at%Si segregated in the region between the titanium substrate and the Al3Ti intermetallic phase in heat-treated Ti/c.p. Al joints. It is suggested that silicon segregation retards Al3Ti formation by acting as a barrier to titanium and aluminium diffusion at the joint interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00356068
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  • 9
    Electronic Resource
    Electronic Resource
    Counteraction of particulate segregation during transient liquid-phase bonding of aluminium-based MMC material (1995)
    Springer
    Journal of materials science 30 (1995), S. 1075-1082 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Particle segregation during transient liquid-phase bonding of aluminium-based metal matrix composite material using copper filler metal was investigated. Segregation was promoted by the slow movement of the solid-liquid interface during isothermal solidification and alumina particles with diameters less than 30 Μm were segregated when the copper foil thickness exceeded 5 and 15 Μm for the base metals examined. When bonding at 853 K, the liquid widths produced using these copper foil thiciknesses were almost identical to the median inter-particle spacing in the base metals investigated. When the amount of liquid formed at the bonding temperature decreased below a critical level, the test specimens broke apart immediately following the joining operation. The minimum film thickness of copper for satisfactory joint strength increased from 0.6 Μm to 2.4 Μm, when the heating rate to the bonding temperature decreased from 1 Ks−1 to 0.01 Ks−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01178448
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  • 10
    Electronic Resource
    Electronic Resource
    The shear strength of drawn polypropylene sheets (1991)
    Springer
    Journal of materials science 10 (1991), S. 1007-1008 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00721828
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