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  • 11
    Electronic Resource
    Electronic Resource
    Monotectic Growth: Unanswered Questions (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 508 (Mar. 2006), p. 45-50 
    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: Early solidification experiments in immiscible alloy systems almost immediately led toconflicting findings between investigators. Investigations revealed that several factors usually considered unimportant, especially the interfacial energy relationships between phases, could have a dramatic influence on the types of microstructures produced in immiscible alloy systems. During the 1980s, work concentrated on the influence interfacial energy on microstructure. However, somefindings raised new questions. In the mid 1990s and continuing through today, most efforts have focused on modeling the monotectic growth process and on obtaining steady state coupled growth conditions in hypermonotectic alloys. This paper focuses on some of the advances that have been made to date in understanding solidification in immiscible alloy systems and some of the questions that remain to be answered
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.508.45.pdf
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  • 12
    Electronic Resource
    Electronic Resource
    Annealing Behavior of the Compressed AZ31 Magnesium Alloy with Different Strain (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 267-270 
    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 cold-compressed AZ31 magnesium alloys with different (2.5%, 5%, 7.5%, 10%,12.5% and 15%) were annealed at different temperatures (573, 623 and 673K) for different time. Withaid of the optical microscopy, and microhardness tester, the microstructural evolution duringannealing at different temperature of the compressed AZ31 has been investigated. Themicrostructural characterized results were further related to the hardness test results and the calculatedactivation energy. The results showed that for the compressed AZ31, the recrystallization can occuron the samples with the strain just above 10% and the deformation twinning plays an important roleon the nucleation and grain growth of the recrystallization. It was found that the twinning boundarywas the location of the recrystallization nuclei and a lot of recrystallized grains with equiaxed shapewere found along the twinning boundaries. The relationships among the nuclei orientations and thecrystallographic orientations on both sides of the twining boundary have been statisticallyinvestigated. The effects of the compressed strain and the annealing temperature on annealingbehavior were also discussed based on the experimental results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.267.pdf
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  • 13
    Electronic Resource
    Electronic Resource
    Hot Compression Deformation Simulation of AZ61B Magnesium Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 373-377 
    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 hot compression deformation behavior of AZ61B magnesium alloy has beeninvestigated by using a Gleeble-1500D thermal simulator. The samples were compressed to areduction of 50% at two temperatures (623 and 673K) with different strain rates (0.01, 0.1 and 1s-1).The relationships between flow stress and deformation temperature were analyzed, and thedeformation activation energy and stress exponent were calculated based on the experimental results.With aid of the optical microscopy, scanning electron microscopy (SEM) and electron back scattereddiffraction (EBSD) techniques, the microstructure and micro-texture of the deformed samples werecharacterized. The effects of the temperature and strain rates on the hot compression behavior of theAZ61B magnesium alloy have been investigated by detail analyses of the flow stress andmicrostructural characteristics of the deformed samples. For the 50% compressed samples, dynamicrecrystallization occurred during the hot compression. The orientations of the dynamic recrystallizedgrains with equiaxed shape were investigated by EBSD technique. The relationships among the flowstress, dynamic recovery and recrystallization have been discussed by considering both thetemperature and strain rate effects
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.373.pdf
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  • 14
    Electronic Resource
    Electronic Resource
    Generation of Initial Microstructures for Monte Carlo Potts Model Simulations of Quasi-Binary Grain Growth (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 558-559 (Oct. 2007), p. 821-824 
    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/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.821.pdf
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  • 15
    Electronic Resource
    Electronic Resource
    Recovery and Recrystallization as a Function of Deformed Microstructure Orientation in Coarse Grained Cold-Rolled Ni (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 558-559 (Oct. 2007), p. 149-152 
    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 effect of crystal orientation on the recovery and recrystallization of cold-rolled Ni(99.96% purity) has been investigated. Particular attention was paid to the annealing response ofregions with either the Copper (C), Brass (B) or S rolling texture orientations. Samples with aninitial average grain size of approx. 500μm were deformed to strains of up to εvM = 4.5. As a resultof the large initial grain size, even after high rolling reductions it is possible to find sufficiently largeregions of material with similar crystal orientation to analyze the recovery and recrystallizationbehaviour as a function of crystal orientation. Microstructural investigations were carried out in thescanning electron microscope using both electron channeling contrast and electron backscatterdiffraction orientation mapping. Both the S and C orientation regions exhibit a heterogeneousmicrostructure containing bands of localized deformation. The presence of volumes surrounded byhigh angle boundaries in these regions strongly influences both the recovery and recrystallizationbehaviour of the material. Twinning was observed also to play an important role in the generation ofrecrystallized grains, with twin chains of up to 3 generations being observed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.149.pdf
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  • 16
    Electronic Resource
    Electronic Resource
    Effect of Temperature on Microstructure and Texture during Compression of AZ31 (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 245-248 
    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 hexagonal crystal structure of AZ31 results in a very high mechanical anisotropy and apoor formability of this alloy. In order to address these problems the influence of twinning, slip anddynamic recrystallization (DRX) on the microstructure and texture evolution during compression ofAZ31 has been studied over a range of temperatures. Cylindrical samples were tested uniaxially incompression from room temperature to 350oC, with the compression axis parallel to either the normaldirection (ND) or the transverse direction (TD) of the hot-rolled sheet from which the samples werecut. The microstructure was characterized using electron backscattered diffraction (EBSD) analysis.Extensive twinning was only observed in the TD samples at all temperatures. The effect of thedifference in twinning and slip between the TD and ND samples on the mechanism of dynamicrecrystallization has also been investigated. For this, the grains formed during DRX were identified bytheir appearance in EBSD orientation maps and the orientations of these grains determined
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.245.pdf
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  • 17
    Electronic Resource
    Electronic Resource
    Dynamic Recrystallization of 3104 Aluminum Alloy during Isothermal Compression Deformation at Elevated Temperatures (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1061-1064 
    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 dynamic recrystallization characteristic of 3104 alloy has been investigated byisothermal compression deformation at temperatures from 573K to 773K under constant strain ratesranges from 10-3s-1 to 1s-1. It was shown that the form of flow stress curves were very sensitive totemperature and strain rate. At high temperatures and low strain rates, dynamic recrystallization of3104 alloy deformation occured. The critical value for dynamic recrystallization start was determinedfrom an inflection point that was observed in the plot of work hardening rate vs. flow stress andverified metallograhically based on quenching samples interrupted during deformation. In theexperimental domain studied, the ratio of the critical strain for the initiation of dynamicrecrystallization to that of the peak strain falled in the range 0.4-0.6. Furthermore, the dependence ofεc on Zener-Hollomon parameter( Z) has been developed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1061.pdf
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  • 18
    Electronic Resource
    Electronic Resource
    Modeling of Cube-Texture Evolution during Grain Growth in Ni Thick-Films based on Experimental Observations (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 558-559 (Oct. 2007), p. 1043-1050 
    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/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.1043.pdf
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  • 19
    Electronic Resource
    Electronic Resource
    Influence of SME and Microstructure in FeMnSiCrNi SMA for Strengthening of Austenite Matrix (2000)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 327-328 (Jan. 2000), p. 231-234 
    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/2011/0528/02/04/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.327-328.231.pdf
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  • 20
    Electronic Resource
    Electronic Resource
    Effect of Rolling and Annealing on the Mechanical Properties and Microstructure of AZ31 Magnesium Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 379-382 
    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: Microstructural evolution and mechanical properties of the AZ31 magnesium alloy duringrolling and annealing process were investigated. The sheet samples were prepared after differentstages of the hot rolling, cold rolling and annealing processes. The hot rolling temperature wasbetween 300-450[removed info]C and the final thickness of the cold rolled sheets was 1.5mm. The cold rolledsheets were annealed at different annealing temperature (260-350[removed info]C) for different time (10~120min).Tensile test was performed to investigate the mechanical properties of the samples obtained fromdifferent stages. With aid of the optical microscopy, scanning electron microscopy (SEM) techniques,the microstructure of the samples were characterized and the results were related to the mechanicalproperties. It was found the hot-rolled sheets exhibit higher ductility comparing with the cold-rolledsheets. The microstructural investigation showed that the microstructure of the hot-rolled sampleswas dominated by recrystallized equiaxed grains while the microstructure of the cold-rolled samplesdominated by deformation twining. By applying annealing on the cold-rolled sheets, finerecrystallization grains were obtained and ductility of the samples was improved. The effects of thegrain size and twining on mechanical properties of the AZ31 sheet were further discussed based onthe experimental results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.379.pdf
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