Nano-Al2O3 reinforced Fe-Cr-Ni composites fabricated by reactive hot pressing

被引:5
作者
Chen, Chang [1 ]
Yu, Ting [1 ]
Yang, Jian-Feng [1 ]
Gao, Ji-Qiang [1 ]
Jin, Zhi-Hao [1 ]
Niihara, Koichi [2 ]
机构
[1] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
[2] Nagaoka Univ Technol, Extreme Energy Density Res Inst, Niigata 9402188, Japan
来源
ECO-MATERIALS PROCESSING AND DESIGN VIII | 2007年 / 544-545卷
关键词
heat-resistant metal; nano-Al2O3; reactive hot pressing; microstructure;
D O I
10.4028/www.scientific.net/MSF.544-545.87
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Based on low-temperature hot-press sintering and rapid thermit reaction, heat-resistant metal matrix composites with nano-ceramic reinforcement were prepared via reactive hot pressing. According to XRD, the composites comprised predominantly of (fcc) Cro.j9Feo.7Nio.jj, (fcc) Fe-Cr and alumina at 700 degrees C through the highly-exothermic thermit reaction between the starting powders. Three-point bending strength, fracture toughness, Vickers hardness and relative density increased with the increase of hot-press sintering temperature and holding time. The improving mechanical properties may be explained by increasing of content of (fcc) Cr0.19Fe0.7Ni0.11. SEM analysis showed a microstructure consisting of equiaxial granules at 700 degrees C for 1 h and a uniformly dispersed network of very fine grains at 700 degrees C for 2 h. It is considered that, in the reactive hot-pressing process, Al atoms diffused into the metal matrix (Fe2O3, Cr, Ni) sites and formed Al2O3 and Fe-Cr-Ni matrix. Such a technique offers the possibility of synthesizing heat-resistant metal matrix composites with nano-ceramic reinforcement materials at considerably lower temperature.
引用
收藏
页码:87 / +
页数:2
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