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  • 1
    Electronic Resource
    Electronic Resource
    The Effect of Si Content on the Mechanical Properties of Rheocast Al Components Using the RHEOMETAL〈sup〉TM〈/sup〉 Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 779-784 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The RHEOMETALTM process is a commercially used semi-solid process for productionof high integrity cast components. The process differs from most other semi-solid casting processesin that temperature control is not necessary during processing and large amount of slurry withrequired solid fraction can be quickly produced. The simplicity of this process has led to a largecommercial interest during the last year.This work is based on an investigation regarding the variation of as-cast mechanical properties forsecondary Al-Si based alloys (~2.5 % Cu) with a Si content varying from 4.55 to 8.90 % using theRHEOMETALTM process. The purpose was to find the most suitable Al-Si alloy for rheocasting, incomparison with the common HPDC-alloy A380 (EN-AC46000). It was found that lower Sicontaining alloys exhibited better elongation but slightly lower yield strength. The alloy containing5.39 wt% Si showed the highest ultimate tensile strength in this investigation. The lower Sicontaining alloys also demonstrated better feedability in the rheocasting process, which is contraryto what normally is found for normal liquid casting processes. Based on the results in thisinvestigation it is recommended to use an alloy containing about 5-7 wt% Si for rheocastingpurposes
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.779.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanisms of Segregation Band Defect Formation in Pressure Die-Cast Magnesium Components (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 381-384 
    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: Segregation bands which normally follow the outer contours of a casting are common in commercial magnesium alloy pressure die castings. Several models have been proposed in the literatures which attempt to explain mechanisms behind the formation of this type of segregation bands. However, it is difficult to explain some phenomena which occur in real die cast components. In this paper, a new theory concerning the formation of one common and detrimental segregation band defect (Type I) has been proposed, which is based on a coupled analysis of heat flow and volume changes during solidification. The formation of this type bands was related to a pressure drop in the liquid and resulting flow of segregated liquid from the surrounding two-phase regions. Mechanism on the formation of the other type segregation band (Type II or under surface band) is also proposed. The sudden increase of cooling rate at the moment of applying intensification pressure is believe to has main contribution to the formation of this type of bands
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.381.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    On some Characteristics of Microstructure and Defects in Die-Cast Magnesium Components (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 283-286 
    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: Some commercial Mg components have been die cast at various casting conditions. The influence of process parameter settings on the microstructural features as well as one kind of defect called segregation band defect were investigated. It was found that more pre-solidified crystals were formed in the condition of lower casting temperature, and more broken dendrites and spherical crystals were formed under higher injection speed. The distribution characters of pre-solidified crystals were also presented and discussed in this paper. Concerning the band defects formed during die casting, a variety of segregation band morphologies as well as the influence of various casting conditions the performances on bands was presented. It was found out that intensification pressure has the strongest effect on the performance of segregation bands inside the castings
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.283.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    The Effect of Mould Constraints on the 0.2% Proof Stress of As-Cast Mg-Al Alloys (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 165-168 
    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: When a casting solidifies and cools down in a metallic mould, stresses and strainsdevelop as a result of uneven temperature distributions, metal shrinkage and mould constraints. At ejection from the mould, the casting usually springs back slightly when the elastic part of the strain is released. However, due to the low flow stress at high temperatures it is likely that the casting also has experienced some plastic deformations, meaning that the dislocation density has increased. This paper discusses how the existence of remaining plastic deformations affects the initial flowbehavior and the yield strength during tensile testing of as cast Mg-Al alloys with different degrees of mould constraints
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.165.pdf
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