Si3N4p-SiCw/MoSi2复合材料的强韧化效果与机制
Strengthening-toughening Effect and Mechanism of Si3N4p-SiCw/MoSi2 Composite
摘 要
通过显微组织观察和力学性能测试,对SiC晶须和Si3N4颗粒复合强韧化MoSi2的效果及其作用机制进行了初步研究和探讨.结果表明:复合材料中的SiC晶须和Si3N4颗粒的加入可大幅提高其抗弯强度、断裂韧度和维氏硬度;弥散强化和细晶强化是复合材料强度提高的主要机制,抗弯强度达到427 MPa;通过晶粒细化、裂纹偏转和分叉等机制的综合作用使复合材料增韧,室温断裂韧度达到10.4 MPa·m1/2.
复合材料
Si3N4
SiC晶须
强韧化
MoSi2
composite
Si3N4
SiC whisker
strengthening-toughening
Abstract
The strengthening-toughening effect and mechanism of SiC whiskers and Si3N4 particles on MoSi2 matrix were premilimary investigated and discussed through the observation of microstructure and the measurement of mechanical properties.The results show that the bending strength,Vickers-hardness and fracture toughness of the composite were improved obviously due to the addition of SiC whiskers and Si3N4 particles.The strengthening mechanism of the composite was the effect of dispersion strengthening and grain refining.The bending strength reached 427 MPa.The toughening mechanism was the synthetic effect of grain refining,crack deflection and crack branching.The room temperature fracture toughness of Si3N4p-SiCw/MoSi2 composite was 10.4 MPa·m1/2.
中图分类号 TG148
所属栏目 新材料 新工艺
基金项目 中国博士后基金资助项目(20060400261);中国博士后基金特别资助项目(200801350);教育部博士点(新教师)基金资助项目(200805331062)
收稿日期 2008/8/15
修改稿日期 2009/5/6
网络出版日期
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备注周宏明(1974-),男,湖南株洲人,副教授,博士.
引用该论文: ZHOU Hong-ming,LIU Gong-qi,XIAO Lai-rong,YI Dan-qing. Strengthening-toughening Effect and Mechanism of Si3N4p-SiCw/MoSi2 Composite[J]. Materials for mechancial engineering, 2009, 33(8): 46～49
周宏明,柳公器,肖来荣,易丹青. Si3N4p-SiCw/MoSi2复合材料的强韧化效果与机制[J]. 机械工程材料, 2009, 33(8): 46～49
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参考文献
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【6】刘心宇,康伟才,王德志.自蔓延高温合成MoSi2/Mo5Si3复合材料[J].中南工业大学学报,1998,29(5):476-478.
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【8】IHUI H,ITO K,NAKAMOTO T,et al.Stacking faults on (001) and their influence on the deformation and fracture behavior of single crystals of MoSi2-WSi2 solid-solutions with the C11b structure[J].Materials Science and Engineering,2001,A34(1/2):31-38.
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【10】NEWMAN A,SAMPATH S,HERMAN H.Processing and properties of MoSi2/SiC and MoSi2 /Al2O3[J].Materials Science and Engineering,1999,A261(1/2):252-260.
【11】YAMADA K,KAMIYA N.High temperature mechanical properties of Si3N4-MoSi2 and Si3N4-SiC composites with network structures of second phases[J].Materials Science and Engineering,1999,A261(1/2):270-277.
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【13】周宏明,易丹青.热压Si3N4/MoSi2复合材料的强韧化效果与机制[J].机械工程材料,2008,32(3):23-25,28.
【14】WANG Gang,JIANG Wan,BAI Guang-zhao,et al.Si3N4 rod-like crystal-reinforced MoSi2 matrix composites[J].Materials Letters,2004,58(3/4):308-331.
【15】肖纪美.金属的韧性与韧化[M].上海:上海科学技术出版社,1983:156-162.
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