Nanocrystalline FeAl matrix composites reinforced with TiC obtained by hot-pressing consolidation of mechanically alloyed powders
Nanocrystalline FeAl matrix composites reinforced with TiC obtained by hot-pressing consolidation of mechanically alloyed powders
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DOI：
10.1016/j.intermet.2007.04.009
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发表时间：
2007-10-01
期刊：
影响因子：
4.4
通讯作者：
Kulik, T.
中科院分区：
文献类型：
--
作者：
Krasnowski, M.;Kulik, T.
采用热压烧结法制备了TiC含量分别为50%、30%和10%的纳米Fe（Al）-TiC复合粉末增强FeAl基块体纳米复合材料。在1000摄氏度和7.7GPa的压力下压实粉末。固结材料的结构研究表明，在烧结过程中发生了Fe（Al）固溶体到FeAl金属间化合物的转变，并且基体和增强体都保持纳米晶，平均晶粒尺寸约为20 nm。我们推断，在高温下施加高压阻碍晶粒生长。所生产的材料的显微硬度相对较高，范围在1363和1608 HV0.2之间，取决于TiC的量。所获得的块体材料的密度非常接近“理想”值的100%，并且开孔率为零。这些结果以及结构研究表明，保持复合材料成分的纳米晶粒尺寸的压实质量是令人满意的。(c)2007爱思唯尔有限公司保留所有权利。
Bulk FeAl matrix nanocomposites reinforced with 50%, 30% and 10% of TiC were produced by hot-pressing consolidation of mechanically alloyed nanocrystalline Fe(Al)-TiC composite powders containing different amounts of reinforcement. The powders were compacted at 1000 degrees C under a pressure of 7.7 GPa. Structural investigations of the consolidated materials revealed that transformation of the Fe(Al) solid solution into FeAl intermetallic had occurred during sintering and that both the matrix and the reinforcement remained nanocrystalline, with the mean crystallite size of about 20 nm. We infer that applying of a high pressure hinders grain growth at elevated temperature. The microhardness of the produced materials is relatively high, ranging between 1363 and 1608 HV0.2, depending on the amount of TiC. The density of the obtained bulk materials is very close to 100% of the "ideal" value and the open porosity is zero. These results as well as structural investigations show that the quality of compaction with preserving of the nanometric grain size of the composite constituents is satisfactory. (c) 2007 Elsevier Ltd. All rights reserved.