原位合成MoSi_2-SiC复合材料的高温强化  

ELEVATED TEMPERATURE STRENGTHENING OF SYNTHESIZED IN SITU MoSi_2-SiC COMPOSITE

作　　者：孙祖庆[1] 张来启[2] 杨正玥 傅晓伟[2] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《金属学报》2001年第4期369-372,共4页Acta Metallurgica Sinica

基　　金：国家自然科学基金资助项目59895150-04-02

摘　　要：采用高温压缩实验研究了不同体积分数 ＳｉＣ含量对原位合成 ＭｏＳｉ２—ＳｉＣ复合材料在 １０００－１４００℃ 的屈服强度及流变应力的影响结果表明，与单－ ＭｏＳｉ２材料相比，复合材料的高温强度随 ＳｉＣ含量的增加而明显提高．高温屈服强度 σｙ和第二相 ＳｉＣ粒子间距λＳ服从σＹ＝σ０＋ｋλＳ－１／２关系式结合组织结构的研究结果对其相间障碍强化的高温强化机制进行了初步探讨．The effects of SiC volume fraction on yield strength and flow stress of synthesized MoSi2-SiC composite synthesized within the temperature range between 1000 and 1400 degreesC were investigated by compressive tests. The results show that the high temperature strength of the composite is significantly higher than that of monolithic MoSi2. With increasing SiC volume fraction, the yield strength and flow stress of composite increase. The relationship between yield strength sigma (y) and interparticle spacing lambda (s) follows equation as sigma (y) = sigma (0) + k lambda (-1/2)(s). It is suggested that increase in strength at elevated temperature is resulted from interphase strengthening.

关 键 词：MOSI2-SIC复合材料 原位合成 相间障碍强化 高温压缩 

分 类 号：TB332[一般工业技术—材料科学与工程]