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  • 1
    Electronic Resource
    Electronic Resource
    Fatigue performance of repaired pipeline steel welds (1988)
    Springer
    Journal of materials science 7 (1988), S. 1353-1354 
    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/BF00719981
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanical properties of a marine shaft steel with banded ferrite-pearlite structure (1989)
    Springer
    Journal of materials science 8 (1989), S. 1257-1259 
    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/BF00721484
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of heat treatment on properties of copper-based shape-memory alloy (1996)
    Springer
    Journal of materials science 31 (1996), S. 1537-1543 
    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 An investigation was performed on a Cu-Zn-Al ternary alloy to examine the influence of heat treatment on its shape-memory effect. Four heat treatments were carried out, namely, step quenching, ice-water quenching, water quenching and glycol quenching from three different temperatures of 800, 850 and 900°C, It was observed that step-quenched samples showed the best martensitic structure for high resistance to shape-memory degradation. Ice-water quenching induced vacancy-pinning effects and hence lowered transformation temperature and degradation life compared to step quenching. However, no transformation was detected in water and glycol-quenched specimens due to the stabilization of martensite. The results showed that shape-memory effect is strongly influenced by many heat-treatment parameters, such as betatizing temperature, betatizing duration and rate of quenching. Step-quenched specimens also showed a higher number of cycles to failure in comparison to ice-quenched specimens. Owing to the dominating effects of large grain size and martensitic plates, the advantages of step quenching, however, disappeared when a high betatizing temperature of 900°C was used. Several kinds of defects were observed after fatigue testing, namely microvoids, cracks near martensitic plates, cracks at the interface of inclusions and inside inclusions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00357862
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal fatigue property of high-density polyethylene (1992)
    Springer
    Journal of materials science 11 (1992), S. 1012-1013 
    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/BF00729912
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of Precipitation Hardening of 6061/10% SiC Composite by Differential Scanning Calorimetry (1998)
    Springer
    Journal of thermal analysis and calorimetry 54 (1998), S. 825-835 
    Details
    ISSN: 1572-8943
    Keywords: Al alloy ; DSC ; hardness measurement ; peak-aging ; precipitation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The precipitation of a supersaturated 6061 Al alloy reinforced with 10% SiCpwas monitored by using a DSC technique. DSC thermal curves were used to predict peak-aging temperatures and durations. The activation energies for precipitation of the β″ phase were found to increase with elevation of the solution temperature from 510 to 600°C, and hence the peak-aging temperature and duration also increased. Microstructural examination revealed an increase in grain size when a high solution temperature was applied. To compare predicted peak-aging temperatures and durations, hardness measurements were carried out after artificial aging. The studies revealed that peak-aging hardening was obtained when the aging temperatures and durations corresponded to about 95% to 97% precipitation of β″ phase from conversion plots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010196005237
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  • 6
    Electronic Resource
    Electronic Resource
    Measurement of crack-profiles using AC field measurement method (1994)
    Springer
    Journal of nondestructive evaluation 13 (1994), S. 155-163 
    Details
    ISSN: 1573-4862
    Keywords: Crack-profile ; crack aspect ratio ; alternating current field measurement ; boundary element method ; pseudo-random error ; smoothing technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract The alternating current field measurement technique has been employed in the present study to predict cracks of different profiles. Profiles used included surface thumb-nail cracks of semi-circular, semi-elliptical, asymmetrical and rectangular shape with aspect ratios ranging from 2 to 10. From the potential ratios measured experimentally, a numerical approach was employed to compute the crack profiles. Crack profiles were also computed from theoretical potential profiles obtained using boundary element method. The present study shows that with high aspect ratios, the crack profiles predicted using theoretical data bore great resemblance to that of the actual. The underpredictions at the centre-line position of the cracks were small. Using experimentally measured potentials with 1-dimensional interpretation, all predicted profiles showed an under estimation of the actual. The errors appeared generally lower for the narrower plate and decreased with increase in aspect ratio. Pseudo-random errors were introduced to the theoretical potentials to simulate measurement errors that may occur in practice, to improve the error handling capability of the computer programme designed for the study. In addition, a smoothing technique was also applied to improve the accuracy of the crack profile prediction. By “freezing” some of the distant potential field, a significant computer processing time reduction of 25–35% has been achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00742581
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  • 7
    Electronic Resource
    Electronic Resource
    Recent development in the fabrication of metal matrix-particulate composites using powder metallurgy techniques (1994)
    Springer
    Journal of materials science 29 (1994), S. 1999-2007 
    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 It is advantageous to fabricate metal matrix-particulate composites (MMPCs) using powder metallurgy (PM) because the fabricated composites possess a higher dislocation density, a small sub-grain size and limited segregation of particles, which, when combined, result in superior mechanical properties. The various PM-related processes currently in use in the fabrication of MMPCs, are reviewed, outlining the common problems encountered in each of these fabrication processes. The more recently developed PM techniques to fabricate MMPCs are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01154673
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis of titanium diboride TiB2 and Ti-Al-B metal matrix composites (2000)
    Springer
    Journal of materials science 35 (2000), S. 241-248 
    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 Titanium diboride TiB2 and TiAl aluminide composites reinforced with in situ borites have been synthesized from the elemental powders of Ti and B, and Ti, Al and B respectively using mechanical alloying technique. No progressive diffusion between Ti and B was observed. The formation of TiB2 was found to be governed by strong and fast exothermic heat release. This indicates that the formation of TiB2 compound in local area of mechanically alloyed powder generated high energy which in turn ignited and promoted the formation of new compound in the rest of the area. Because of the presence of Al in Ti-Al-B system, the concentration of Ti or B was diluted. The exothermic reaction between Ti and B was consequently delayed. However, grain refinement of Ti and Al in this system down to nanometer scale is faster than that in Ti-Al system due to the contribution of B. Using X-ray analysis, strong but broad TiAl, and weak TiB and TiB2 peaks had been detected at 50 h of mechanical alloying indicating the formation of nano TiAl composite reinforced by TiB and TiB2. However, TiB was, however, not a stable phase; it later was transformed into equilibrium phase of TiB2 after annealing at 800 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004789910279
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  • 9
    Electronic Resource
    Electronic Resource
    Improvement of microstructure and mechanical properties of AZ91/SiC composite by mechanical alloying (2000)
    Springer
    Journal of materials science 35 (2000), S. 5553-5561 
    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 AZ91 magnesium alloy reinforced with SiC particulates was fabricated via powder metallurgy technique as well as mechanical alloying process where a planetary ball mill was employed. Microstructure and mechanical properties of the fabricated AZ91 composites had been evaluated. Microstructural study showed that grain size of the material was refined and SiC particulates were well distributed after mechanical alloying. Mechanical tests of the composite showed an enhanced yield and ultimate tensile strengths for the mechanically alloyed samples compared with those prepared via the powder metallurgical route.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004892610575
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of gap filler and brazing temperature on fracture and fatigue of wide-gap brazed joints (1995)
    Springer
    Journal of materials science 30 (1995), S. 2101-2107 
    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 gap filler content on the fracture, fatigue crack initiation and propagation of AISI 316 stainless steel wide-gap brazed with nickel-based filler metal has been investigated. The brazed joints were found to consist of eutectic, intermetallic compound and solid solution. The volume of solid solution was observed to depend on the gap filler content and brazing temperature. Tensile tests with extra small strain gauge bonded at the centre of the joints showed that the strength and elongation of the brazed joints increased with brazing temperature, and the addition of gap filler was able to improve the load-carrying capacity of the brazed joints only when the brazing temperature was high enough. Fatigue crack initiation and growth under displacement amplitude control were also carried out. Crack closure in the brazed joints was determined by means of back face strain on the compact tension specimen used. The introduction of gap filler was able to increase the fatigue and fracture resistance of the brazed joints when a suitable brazing temperature was used. Crack deflection, branching and uncracked ligament bridging behind the crack tip were observable along the crack paths. Experimental results showed that gap filler was able to enhance the crack closure caused by roughness and ligament bridging.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00353041
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