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Si3N4(p)/SiC(w)協(xié)同復(fù)合MoSi2材料的強(qiáng)韌化及機(jī)理研究
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Strengthening and Toughening Effect and Its Mechanism for
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中國(guó)博士后基金資助項(xiàng)目(20060400261)

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    采用X射線衍射(XRD)、掃描電子顯微鏡(SEM)、維氏硬度計(jì)、電子萬(wàn)能材料試驗(yàn)機(jī)研究MoSi2-Si3N4(p)/SiC(w)復(fù)合材料的結(jié)構(gòu)、形貌、硬度、斷裂韌性，并對(duì)SiC晶須和Si3N4顆粒復(fù)合強(qiáng)韌化MoSi2的機(jī)理進(jìn)行了探討。結(jié)果表明，SiC晶須和Si3N4顆粒對(duì)MoSi2具有協(xié)同強(qiáng)韌化作用，MoSi2-20% Si3N4(p)-20%SiC(w)(體積分?jǐn)?shù), 下同)復(fù)合材料的抗彎強(qiáng)度達(dá)427 MPa，室溫?cái)嗔秧g性達(dá)到10.4 MPa·m1/2，均高于單一強(qiáng)韌化劑的強(qiáng)韌化效果。MoSi2-20% Si3N4(p)-20%SiC(w)復(fù)合材料的強(qiáng)化機(jī)理為細(xì)晶強(qiáng)化和彌散強(qiáng)化；韌化機(jī)制為細(xì)晶韌化、裂紋偏轉(zhuǎn)與分支和微橋接韌化

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    The structure, morphology, hardness, breaking toughness, strengthening and toughening mechanism of MoSi2-Si3N4(p)/SiC(w) composites were investigated by means of XRD, SEM, Vichers hardness tester and electrical omnipotence material tester in this paper. It is shown that the SiC whiskers and Si3N4 particles have the coordinated strengthening and toughening effect on MoSi2, the bending strength and room temperature fracture toughness of MoSi2-20 vol% Si3N4(p)-20 vol%SiC(w) composite are 427 MPa and 10.4 MPa·m1/2, respectively, which is higher than that of MoSi2 strengthened and toughened by SiC whiskers or Si3N4 particles. The strengthening mechanism of MoSi2-Si3N4(p)/SiC(w) composites are the fine grains and dispersion strengthening, and the toughening mechanism are the fine grain toughening and the crack deflection and the micro bridge join toughening.

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周宏明,易丹青,柳公器,肖來(lái)榮. Si3N4(p)/SiC(w)協(xié)同復(fù)合MoSi2材料的強(qiáng)韌化及機(jī)理研究[J].稀有金屬材料與工程,2009,38(11):1955~1959.[Zhou Hongming, Yi Danqing, Liu Gongqi, Xiao Lairong. Strengthening and Toughening Effect and Its Mechanism for[J]. Rare Metal Materials and Engineering,2009,38(11):1955~1959.]
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  • 收稿日期:2008-10-25
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