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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of Mushy Zone of ZWx2 (x=2, 4, 6) Magnesium Alloys (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 581-585 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The potentials of Mg-Al system alloys for semi-solid forming have been extensivelyevaluated these years. In the present studies, mushy zone properties of the Mg-Zn system alloys, i.e.ZWx2 (x=2, 4, 6), are characterized and analyzed by using cooling curve thermal analysis method andcontinuous torque measurement technique. The results show that Tn1 (first characteristic temperatureof primary crystal nucleation), Tn2 (second characteristic temperature of primary crystal nucleation)and Tch (temperature of dendritic coherency) decrease with the increasing of zinc content, and thetemperature difference of (Tn1-Tn2) almost remains constant, while the temperature difference of(Tn2-Tch) changes dramatically when Zn content increases to 6wt.%; The results also show that the fs-cc(solid fraction of dendritic coherency) of ZWx2 alloys ranges from 0.4 to 0.51 while ZW22 andZW62 alloys having higher fs-ch and ZW42 alloy having the lowest fs-ch; also, strength of alloys inmushy zone does not develop until a certain fraction solid( corresponding to the dendrite coherencypoint) is reached. The results obtained by cooling curve thermal analysis method and continuoustorque measurement techniques are comparable to each other
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.581.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Investigation of Compression Deformation Behavior and Microstructure Evolution of NiAl-Cr (Mo)-Hf Alloy at Elevated Temperature (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 457-461 
    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: NiAl-based alloy is a promising material applied in the fields of aeronautic and astronauticinstruments. In the paper the compression deformation behavior and microstructure evolution ofNiAl-Cr(Mo)-Hf alloy at elevated temperature were studied. The results demonstrate that the alloybehaves good formability in the temperature ranging from 1320°C to 1360°C, in which the maximuminitial strain rate is about 8.3×10-4s-1 and the maximum deformation resistance is lower than 40MPa.During compression at temperature between 1250°C and 1300°C the flow stress increased sharplywith the increasing of the deformation degree. When compression deformation at 1320°C~1360°C,the flow stress decreased obviously and the flow stress decreased slightly after reached the maximumvalue. By analyzing the microstructure evolution during compression it can be concluded thatas-casting microstructure was improved in deformation. The grains were refined and the brittle phasesof lamellar Cr(Mo) existing at NiAl matrix were broken. The porosities in as-casting material wereeliminated during compression and the density of the material increased. The fracture toughness ofthe alloy increased from 6.4MPa·m1/2 to 9.8MPa·m1/2 after compression
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.457.pdf
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    Paper (German National Licenses)
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