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《Journal of The Chinese Rare Earth Society》 2001-05
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Room0Temperature Mechanical Properties of Rare Earth Reinforced MoSi_2 Material

ZHANG Hou an 1,2 , LIU Xin yu 2 (1. Department of Mechanical Engineering and Automation, Xiangtan Polytechnic University, Xiangtan 411201, China; 2. Department of Material Science and Engineering, Central Southern University, Changsha 410083, Chi  
MoSi 2 and rare earth/MoSi 2 materials were prepared by mechanical alloying, IP and high temperature sintering techniques. Their room temperature properties such as bending strength, fracture toughness and electric conductivity were measured. The results show that rare earth has better strengthening and toughening effects on the MoSi 2 matrix than SiC. The bending strength and fracture toughness of 0.9% rare earth/MoSi 2 material are 419.41 MPa and 5.81 MPa·m 1/2 , respectively, which are increased by 46% and 81% than those of the matrix. The strengthening mechanisms of rare earth/MoSi 2 are fine grain and dispersion strengthening. The toughening mechanisms are fine grain toughening, crack deflection and bowing toughening. Moreover, the effect of rare earth on the electric conductivity of MoSi 2 is much weaker than that of SiC. The resistivity of matrix is only raised about 13.9% by addition of 0.9% rare earth.
【Fund】: 湖南省教委资助项目 ( 98C0 5 4)
【CateGory Index】: TG148
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