Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第9卷    第1期    总第30期    1999年3月

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文章编号:1004-0609(1999)01-0049-06
ZrCp/W复合材料的组织结构和高温强度
宋桂明   周  玉   雷廷权   王玉金   郭英奎

(哈尔滨工业大学材料科学与工程学院, 哈尔滨 150001)

摘 要: 在2000℃, 20MPa压力下于1.3×10-3 Pa真空中热压烧结1h制备了含20%ZrC颗粒(体积分数)的钨基复合材料。 组织观察表明: ZrC颗粒比较均匀分布于W基体中, ZrC颗粒阻碍了W晶粒的长大, 也妨碍了材料的致密化;由于ZrCp/W界面处存在W及Zr元素的互扩散, 得到了强的界面结合; 部分W原子扩散到ZrC点阵中, 形成了(Zr, W)C固溶体; 随着温度提高, 复合材料的抗弯强度逐渐提高, 在800℃达到最大值1074MPa, 比室温强度762MPa提高41%, 而后又随温度继续上升而下降。 ZrCp/W复合材料这种好的高温强度主要是由于W基体随温度上升发生了由脆性到塑性的转变, 使ZrC颗粒增强效果在高温得以充分发挥; 位错强化、 载荷传递和裂纹钉扎是ZrCp/W复合材料的高温强化机理。

 

关键字: 钨基复合材料   ZrC颗粒   高温强度   塑脆转变

MICROSTRUCTURE AND ELEVATED TEMPERATURE
STRENGTH OF ZrCp/W COMPOSITES
Song Guiming, Zhou Yu, Lei Tingquan, Wang Yujin and Guo Yingkui

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China

Abstract:Tungsten matrix composites containing 20% ZrC particles (volume fraction) was prepared by hot pressing at 2000℃, 20MPa in a vacuum of 1.3×10-3Pa for 1h. The results show that the ZrC particles are welldistributed within the W matrix, and the growth of W grains is prevented by the ZrC particles during sintering; there is an interdiffusion of Zr and W in ZrCp/W interface, which results in a strong bond; a (Zr, W)C solid solution zone is formed in ZrC. As the temperature increased, the bending strength of ZrCp/W composites increases gradually and reaches its maximum value 1074MPa at 800℃, which is 41% higher than 762MPa at room temperature. The excellent high temperature strength of composites is attributed to tungsten matrix transitting from brittle to ductile with increasing temperature, which makes the strengthening effect of ZrC particle be more significant at high temperature. The strengthening mechanism at high temperature is dislocation strengthening, load transfering and crack pinning.

 

Key words:   tungsten matrix composites   ZrC particle   high temperature strength   ductile-brittle transition

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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