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  • 2005-2009  (8)
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Material
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  • 2005-2009  (8)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Influence of Initial Texture on Twin Formation and Plastic Deformation of Rolled AZ31 Mg Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 149-152 
    Details
    ISSN: 1662-8985
    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 influence of initial texture on the formation of primary twin system of AZ31Magnesium rolled plate was investigated in this work. Uniaxial compression tests were carried outon samples cut along the rolling direction (RD) and normal direction (ND) of rolled AZ31 Mg plateat various temperatures (RT, 150, 200, 250, 300, 350, 400, 450°C) with the fixed strain rate(0.01s-1). The results showed that the primary twinning system of AZ31 Mg alloy (c-axis extensiontwin) occurred actively in the RD compression specimens, which promoted homogeneousdeformation as compared to the ND compression specimens. The effect of temperature on theformation of deformation twins was also investigated, and slip/twin transition temperature wasfound to be 250°C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.149.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Formability and Microstructure of AZ31 Magnesium Alloy Sheets (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 344 (July 2007), p. 31-38 
    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: The formability of AZ31 magnesium alloy sheets has been investigated in thetemperature range varying from 200 to 300°C. Forming limit diagrams have been obtained byperforming Nakazima-based tests. The different straining conditions have been investigated usingsheet blanks with several length to width ratios. The forming limit curves have been related to themicrostructural evolution occurring during deformation. The forming limit diagrams have shown aremarkable increase in formability with temperature that could be related to the occurrence of fulldynamic recrystallization at 300°C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.344.31.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Superplastic Deformation of Twin Roll Cast AZ31 Magnesium Alloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 604-605 (Oct. 2008), p. 267-277 
    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 aim of the present work was to evaluate the potential for superplastic deformation of the AZ31 magnesium alloy produced by Twin Roll Casting (TRC), a continuous casting technology able to convert molten metals directly into a coiled strip. In order to develop a superplastic microstructure, the TRC sheets were heated at 400 °C for 2 h, then rolled by multiple passes with re-heating between them, with a total thickness reduction of about 60%. The superplastic behaviour of the alloy was studied by tensile tests, carried out at in the temperature range from 400 °C to 500 °C and with initial strain rates of 1•10-3 s-1 and 5•10-4 s-1. The microstructural and fractographic characterization of the alloy was carried out by means of optical (OM) and scanning electron microscopy (SEM). The tensile tests evidenced a superplastic behaviour of the processed AZ31 Mg alloy, with a maximum elongation to failure of about 500% at 460 °C, with a strain rate of 5•10-4 s-1. The microstructure of the alloy after superplastic deformation showed fine and equiaxed grains, with a large fraction of high angle boundaries. Analyses of the fracture surfaces evidenced flow localization around the grains, suggesting that grain boundary sliding (GBS) was the main deformation mechanism. Failure occurred by cavitation, mainly at the higher testing temperature, due to the prevailing effect of grain growth
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.604-605.267.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of Temperature and Sheet Thickness on Formability of AZ31 Magnesium Alloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 604-605 (Oct. 2008), p. 147-152 
    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 formability of AZ31 magnesium alloy sheets, with two different thicknesses, has been investigated at room temperature and 250°C by means of Nakazima tests. The different straining conditions have been studied by using sheet blanks with several length to width ratios, and Forming Limit Diagrams were then obtained with and without using lubricant. As expected, an increase in temperature was observed to enhance the formality of the alloy. The formability increases also by increasing the thickness as well as by using Teflon foil as lubricant. The microstructure of the deformed samples was analysed by means of light optical microscope
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.604-605.147.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Hot Working of the ZEK200 Magnesium Alloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 604-605 (Oct. 2008), p. 212-222 
    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 high temperature workability of the ZEK200 Mg-alloy produced by Direct Chill casting (DC) was investigated by torsion testing between 200 and 450°C. The alloy exhibited a higher strength and a slightly lower equivalent strain to fracture than AZ31 and ZM21 produced by DC. The calculation of the constitutive equation gave a value of the activation energy for high temperature deformation close to 175 kJ/mol, in line with those calculated by following the same procedure in AZ31 and ZM21. Partial or complete recrystallization of the deformed structure was observed at 350 and 400°C respectively. Grain growth occurred after recrystallization in the samples tested at 450°C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.604-605.212.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Study of Hot Formability of High Nitrogen Martensitic Stainless Steel (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 604-605 (Oct. 2008), p. 279-284 
    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: Alloying high-chromium steels with Nitrogen leads to increase in strength, fatigue life and corrosion resistance, but reduce ductility and could induce cracks formation during forging. In order to address these problems, the hot working response of a high Nitrogen martensitic stainless steel (Fe-16.2%Cr-1.1%Mo-0.33%N-0.34%C) has been investigated by means of hot torsion tests up to rupture, in the temperature and strain rate ranges of 900-1200°C and 0.005-5 s-1 respectively. The peak stresses of the flow curves were related to strain rate (e&) and temperature (T) by the well known sinh equation. The ductility and the safe working conditions were presented in terms of processing map. The microstructure of the steel in the quenched state after deformation was analyzed by means of optical microscopy; the differences in term of morphology and distribution of the various constituents were discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.604-605.279.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Constitutive Models for AZ31 Magnesium Alloys (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 367 (Feb. 2008), p. 87-94 
    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: The present investigation aims at studying and modelling the flow behaviour of the AZ31magnesium alloy by means of torsion tests performed in extended ranges of temperature and strainrates. Two types of rheological models were considered. The former is based on the power lawequation, whilst the latter is based on the Sellars and Tegart approach. The effectiveness of the twoconstitutive models in describing the flow behaviour of the AZ31 magnesium alloy underinvestigation was evaluated. It was observed that both the equations are able to predict the flowbehaviour of the material at different temperatures and strain rates. In particular, the former is veryeffective in predicting the hardening stage of the flow curve, whilst the latter allows to fit thesoftening stage. The models were used for the finite element analysis of a complex extrusionprocess and the results, in terms of the load-stroke curves, compared to each other
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.367.87.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Hot Workability and Constitutive Equations of ZM21 Magnesium Alloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 367 (Feb. 2008), p. 79-86 
    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: One of the most challenging activities for magnesium industry is to increase productivityby introducing cost-effective processes. While die-cast magnesium alloys are in worldwide use,even in the demanding sector of automotive industry, where cost is the major asset, wroughtmagnesium alloys still not widely available. The aim of the present study was to evaluate the hightemperature response by torsion testing of a ZM21 alloy, to calculate the constitutive equations tobe used in FEM simulation of the extrusion process. The ZM21 alloy that was considered in thepresent study was Direct-Chill casted by Alubin Ltd., Israel. Torsion tests were carried out in air ona computer-controlled torsion machine, under strain rates ranging from 10-2 to 5 s-1 andtemperatures from 200 to 400°C. The equivalent peak flow stress was related to temperature andstrain rate by means of the conventional power-law and by the sinh equation. The microstructure ofthe alloy, even at 300°C, appeared largely unrecrystallized, with elongated grains; also at 400°C,the structure is more equiaxed, but elongated structures still appears
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.367.79.pdf
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