Room-Temperature Mechanical Properties of Rare Earths Reinforced MoSi2 Material
来源期刊：JOURNAL OF RARE EARTHS2001年第4期
论文作者：张厚安 刘心宇
Abstract: MoSi2 and rare-earths/MoSi2 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 earths have better strengthening and toughening effects on the MoSi2 matrix than SiC does. The room temperature bending strength and fracture toughness of 0.9% rare-earths/MoSi2 material are 419.41 MPa and 5.81 MPa·m1/2, which have increased by 46% and 81% than the matrix, respectively. The strengthening mechanisms of rare-earths/MoSi2 are fine-grain and dispersion strengthening. The toughening mechanisms are fine-grain toughening, crack deflection and bowing toughening. Moreover, the effect of rare earths on the electric conductivity of MoSi2 is much weaker than that of SiC whiskers. With the addition of 0.9% rare earths, the resistivity of MoSi2 is only raised by about 13.9%.
张厚安1，刘心宇2
(1.Department of Mechanical Engineering and Automation, Xiangtan Polytechnic University,;
2.Department of Material Science and Engineering, Central Southern University,)
Abstract:MoSi2 and rare-earths/MoSi2 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 earths have better strengthening and toughening effects on the MoSi2 matrix than SiC does. The room temperature bending strength and fracture toughness of 0.9% rare-earths/MoSi2 material are 419.41 MPa and 5.81 MPa·m1/2, which have increased by 46% and 81% than the matrix, respectively. The strengthening mechanisms of rare-earths/MoSi2 are fine-grain and dispersion strengthening. The toughening mechanisms are fine-grain toughening, crack deflection and bowing toughening. Moreover, the effect of rare earths on the electric conductivity of MoSi2 is much weaker than that of SiC whiskers. With the addition of 0.9% rare earths, the resistivity of MoSi2 is only raised by about 13.9%.
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