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《Materials Review》 2011-08
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Grain Refinement of AZ91D Magnesium Alloy by Mg-TiB_2 Master Alloy and Sr

HAN Hui,CHEN Yang,LIU Shengfa,CHEN Xin,LU Cheng,WANG Shuoli(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070)  
The microstructure of Mg-50%TiB2(here after in wt%) fabricated by powder in-situ synthesis process and grain refinement of AZ91D magnesium alloy with Mg-50%TiB2 and Sr were studied using SEM,EDS and XRD.It was found that combining addition of 1.4%(Mg-50%TiB2) master alloy and 0.1%Sr to AZ91D magnesium alloy led to the α-Mg grain size decreasing from 240μm to 49μm.Based on the calculation of the planar disregistry between TiB2 and α-Mg,TiB2 particles can act as the heterogeneous nucleus of primary α-Mg phases.The addition of Sr can increase the degree of undercooling of primary α-Mg phases,and activate the potential TiB2 particles in the solid/liquid interface.
【Fund】: 湖北省自然科学基金(2009CDB002);; 武汉理工大学博士基金(471-38650510);; 中央高校基本科研业务费专项资金(2010-2Y-CL-029)
【CateGory Index】: TG146.22
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