%0 Journal Article
%T MICROSTRUCTURAL FORMATION MECHANISM OF SEMI-SOLID AZ91D ALLOY
%A WMMao
%A ZSZhen
%A HT Chen
%A XYZhong
%A <br>W.M.
%A Mao
%A Z.S.
%A Zhen
%A H.
%A T.
%A Chen
%A X.
%A Y.
%A Zhong
%J 金属学报(英文版)
%D 2005
%I 
%X With the help of an electromagnetic stirring device and alloy melt quenching technology, the microstructure of semi-solid AZ9lD magnesium alloy slurry stirred by a rotationally electromagnetic field was studied and the experimental results are shown as the following. The primary α-Mg grains are refined obviously when the slurry is stirred by a rotational electromagnetic field during continuously cooling and they are eventually changed to fine rosette grains or spherical grains. If the above semi-solid slurry is further stirred isothermally .for some time,much more spherical primary α-Mg grains can be obtained. If the melt is first cooled down to a given semi-solid temperature and then starts being stirred by the rotational electromagnetic field, the primary α-Mg dendrites will be large, and a longer time will be taken and a larger stirring power will be needed for the secondary arms of the dendrites to be remelted on the roots to prepare an ideal semi-solid slurry. Theoretical analysis indicates that the strong flow motion leads to a more even temperature field and a solute field and stronger man-made temperature fluctuation in the AZ91D magnesium alloy melt so that the spherical primary α-Mg grains are increased in the slurry. Moreover, all the measures promoting the temperature fluctuation will be favorable to the formation of spherical primary α-Mg grains and all the factors increasing the arm's root remelting difficulty will be favorable to the formation of rosette-type primary α-Mg grains.
%K AZ91D magnesium alloy electromagnetic stirring
%K microstructure
%K semi-solid<br>AZ91D
%K 合金
%K 金属材料
%K 微结构
%K 机械装置
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=C19B08D052F5FD8445F4BB80A1A5D7BF&aid=24B0631DD8F3D98ABDEE2C12F33523F3&yid=2DD7160C83D0ACED&vid=13553B2D12F347E8&iid=E158A972A605785F&sid=92DA076AF6760FAC&eid=DEBDB7F30FBA7F9B&journal_id=1006-7191&journal_name=金属学报(英文版)&referenced_num=0&reference_num=13