In situ preparation of TiB2 reinforced Al based composites
In situ preparation of TiB2 reinforced Al based composites
复制标题
DOI：
10.1016/s0924-0136(97)00225-2
复制
发表时间：
1998
影响因子：
6.3
通讯作者：
S. Lakshmi;Ling Lu;M. Gupta
中科院分区：
文献类型：
--
作者：
S. Lakshmi;Ling Lu;M. Gupta
Al-TiB2 金属基复合材料是使用 K2TiF6 和 KBF4 盐通过 850°C 的放热反应过程制造的。放热反应时间从最短10分钟到最长40分钟不等，以研究反应程度与TiB2生长行为和形成的TiB2重量百分比之间的关系。微观结构观察显示，反应时间为 30 分钟时，复合材料的晶粒尺寸呈减小趋势；然而，反应时间为 40 分钟时，晶粒尺寸略有增加。使用 X 射线衍射仪来确认 TiB2 的存在，并定量估计不同反应保持时间下复合材料中 TiB2 颗粒的重量百分比。 X射线谱表明，随着放热反应时间的延长，TiB2的量首先增加。反应保持20分钟后，TiB2的量开始减少。最后，本研究中获得的微观结构结果在加工参数方面得到了合理化。
Al–TiB2metal-matrix composites have been fabricated using an exothermic reaction process at 850°C using K2TiF6and KBF4salts. The exothermic reaction period was varied from a minimum of 10 min to a maximum of 40 min to investigate the relationship between the degree of reaction and the growth behaviour of TiB2and the weight percentage of TiB2formed. Microstructural observation showed a decreasing trend in grain size of the composites up to a reaction time of 30 min: it was, however, found to increase slightly for a reaction time of 40 min. An X-ray diffractometer was used to confirm the presence of TiB2as well as to estimate quantitatively the weight percentage of TiB2particles in the composite for the various reaction holding times. X-ray spectra showed that the amount of TiB2increased initially when the exothermic reaction period was prolonged. After a reaction holding time of 20 min, the amount of TiB2started to decrease. Finally, the microstructural results obtained in the present study were rationalized in terms of the processing parameters.