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
