Effects of sintering temperature on fine-grained tungsten heavy alloy produced by high-energy ball milling assisted spark plasma sintering

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• 作者：L. Ding^a ; D.P. Xiang^a ; ^b ; ^{dpxiang@hainu.edu.cn} ; Y.Y. Li^b ; C. Li^a ; J.B. Li^a
• 关键词：Tungsten heavy alloys (WHAs) ; Spark plasma sintering (SPS) ; High-energy ball milling (HEBM) ; Bending strength ; Fracture morphology
• 刊名：International Journal of Refractory Metals and Hard Materials
• 出版年：2012
• 期刊代码：91_02634368
• 类别：et
• 出版时间：July, 2012
• 卷：33
• 期：Complete
• 页码：65-69
• 文件大小：1256 K

摘要

Fine-grained tungsten heavy alloys (WHAs) were successfully produced using the high-energy ball milling assisted spark plasma sintering (SPS) method. The effects of increasing sintering temperatures on the microstructure and mechanical properties of the alloy were studied in detail. The hardness of the alloy was found to continuously decrease from 79.3 to 63.8 HRA. In contrast, the bending strength continuously increased from 353.6 to 954.5 MPa. W grain size increased with increased sintering temperature. The temperature ranges from 1000 to 1100 掳C and 1150 to 1200 掳C were a period of rapid growth of W grain. According to the color change in the scanning electron microscope (SEM) image, the W alloy microstructure were classified into white W grains, off-white W-rich particles, dark grey matrix 纬-(Ni, Fe, W), as well as pitch-black W- and O-rich particles. The bending fracture of the alloy mainly displays the features of intergranular fracture. The microporosity of different sizes was distributed on the bending fracture, and grew with increased sintering temperature.