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  • 1
    Electronic Resource
    Electronic Resource
    Microstructural Evolution in Al/AlN Composites Processed by Mechanical Alloying (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Journal of metastable and nanocrystalline materials Vol. 15-16 (Apr. 2003), p. 457-462 
    Details
    ISSN: 1422-6375
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/43/transtech_doi~10.4028%252Fwww.scientific.net%252FJMNM.15-16.457.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Fatigue Crack Growth Behavior in Girth Weld of Natural Gas Transmission Pipelines (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 303-306 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A clear understanding of fatigue properties for the pipeline steel and its weld is importantto provide information for pipeline design during pipeline construction and predict pipeline fatiguelife during pipeline operation. The materials used in this study are API 5L X65 pipeline steelgenerally used for natural gas transmission. This pipeline was welded by gas tungsten arc welding(GTAW) and shielded metal arc welding (SMAW) with V-groove configuration. The fatigue crackgrowth behaviors of pipeline steel and its girth weld according to crack growth directions and stressratios were investigated over a wide range of stress intensities in laboratory air
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.303.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Microstructure and Mechanical Properties of Twin-Roll Strip Cast Mg Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 119-126 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Development of wrought Mg alloys, particularly in sheet form, is essential to support thegrowing interest for lightweight components in the automotive industry. However, development ofMg alloy sheets has been quite slow due to the complexity of sheet production originated from limiteddeformability of Mg. In this respect, twin-roll strip casting, a one-step processing of flat rolledproducts, can be an alternative for the production of Mg alloy sheets. In this study, AZ31 andexperimental ZM series alloys are twin-roll strip cast into 2 mm thick sheets. The microstructure ofthe as-cast AZ31 alloy sheet consists of columnar zones near the roll side and equiaxed zones in themid-thickness region. On the other hand, as-cast ZM series alloy sheets show equiaxed dendriticstructure through the thickness of sheet. These alloys were subjected to various thermo-mechanicaltreatments and their tensile properties were evaluated. Twin-roll strip cast AZ31 alloy in H24condition has equivalent yield and tensile strengths with similar ductility compared to commercialingot cast AZ31-H24 alloy, indicating that twin-roll strip casting is a viable process for the fabricationof Mg alloy sheets. The experimental ZM series alloys have a large volume fraction of fine dispersoidparticles in the microstructure, resulting from the beneficial effect of twin-roll strip casting onmicrostructural refinement. It has been shown that the experimental ZM series alloys have superiortensile properties compared to commercial ingot cast AZ31-H24 alloy, suggesting the possibility ofthe development of new wrought Mg alloy sheets by twin-roll strip casting
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.119.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Fabrication of Aluminum/Aluminum Nitride Composites by Reactive Mechanical Alloying (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 181-184 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Various reactions and the in-situ formation of new phases can occur during themechanical alloying process. In the present study, Al powders were strengthened by AlN, using thein-situ processing technique during mechanical alloying. Differential thermal analysis and X-raydiffraction studies were carried out in order to examine the formation behavior of AlN. It was foundthat the precursors of AlN were formed in the Al powders and transformed to AlN at temperaturesabove 600oC. The hot extrusion process was utilized to consolidate the composite powders. Thecomposite powders were canned in an Al can and then extruded at elevated temperatures. Themicrostructure of the extrusions was examined by SEM and TEM. In order to investigate themechanical properties of the extrusions, compression tests and hardness measurements were carriedout. It was found that the mechanical properties and the thermal stability of the Al/AlN compositeswere significantly greater than those of conventional Al matrix composites
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.181.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of Alloying Elements on Mechanical Properties of Mg-Al Alloys (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 845-848 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effects of alloying elements on the microstructure and high temperature mechanical properties of Mg-Al alloys were investigated in this study. In order to improve the high temperature mechanical properties, Sr or Mm was added to the Mg-9Al alloy. The effect of Sn on the Mg-9Al alloy was also examined since Sn was expected to improve the high temperature mechanical properties by forming the thermally stable Mg2Sn phase. The specimens used in this study were produced on a 320 ton cold chamber high-pressure die casting machine. The microstructures of the specimens were examined by optical and scanning electron microscopy and tensile and creep tests were performed at elevated temperatures. Tensile tests were carried out at room temperature, 150oC and 200oC using an initial strain rate of 2×10-4/sec. In addition, tensile creep tests were conducted at the stress levels of 50 MPa and 70 MPa. From the microstructure analyses of the specimens after heattreatment at 400oC for 12 hours, it was found that most of the Mg17Al12 precipitate dissolved into the matrix, while the thermally stable phases continued to exist. The high temperature mechanical properties of the Mg-9Al alloys were found to improve significantly with the additions of Sr, Mm and Sn, due to the formation of the thermally stable precipitates
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.845.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Applied Stress on Precipitation Behavior in AZ91D Magnesium Alloy (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 419-422 (Mar. 2003), p. 285-290 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/06/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.419-422.285.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Continuous Casting of Magnesium Billets for Semi-Solid Processing (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 517-520 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Semi-solid processing is recognized as an attractive alternative method for the nearnet-shape production of engineering components. Although there has been a significant progress in semi-solid processing of aluminum alloys, very limited information is available on semi-solid processing of magnesium alloys, except for the thixomolding process. Continuous casting process has been utilized to produce the billets with the desirable cross-section at a reduced production cost for many metals, such as steel, copper and aluminum alloys. It has also been commercially utilized to produce the aluminum billets with non-dendritic microstructure for subsequent thixocasting process. However, continuous casting of magnesium billets for semi-solid processing has not yet been commercialized due to the difficulties involved in casting of magnesium alloys. In the present study, a continuous casting process has been developed for the production of the cylindrical billets of magnesium alloys for the subsequent thixocasting process. In order to obtain the desired non-dendritic microstructure with an excellent degree of homogeneity both in microstructure and composition, an electromagnetic stirring system has been utilized. A continuous casting process has been proven to be an efficient way to produce the high quality billets of magnesium alloys for semi-solid processing. A prototype air conditioner cover was produced using the continuously cast billets of AZ91 alloy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.517.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Corrosion of New Wrought Magnesium Alloys (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 839-844 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The development of new components with magnesium alloys for the automotive industry has increased in recent years due to their high potential as structural materials for low density and high strength/weight ratio demands. However, the limited mechanical properties of the magnesium alloys have led to search new kind of magnesium alloys for better strength and ductility. The main objective of this research is to investigate the mechanical properties and the corrosion behavior of new wrought magnesium alloys; Mg-Zn-Ag (ZQ) and Mg-Zn-Si (ZS) alloys. The ZQ6X and ZS6X samples were fabricated using hot extrusion method. Tensile tests and immersion tests were carried out on the specimens from the extruded rods, which contained different amounts of silver or silicon, in order to evaluate the mechanical properties and corrosion behavior. The microstructure was examined using optical and electron microscopy (TEM and SEM) and EDS. The results showed that the addition of silver improved the mechanical properties but decreased the corrosion resistance. The addition of silicon improved both mechanical properties and corrosion resistance. These results can be explained by the effects of alloying elements on the microstructures of the Mg-Zn alloys such as grain size and precipitates caused by the change in precipitation and recrystallization behavior
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.839.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Fatigue Crack Propagation Behavior of AZ91D Magnesium Alloy (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 419-422 (Mar. 2003), p. 75-80 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/06/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.419-422.75.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Microstructure and Mechanical Properties of Mg-Zn-Ag Alloys (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 419-422 (Mar. 2003), p. 159-164 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/06/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.419-422.159.pdf
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