2207 FeAl基複合材料の高温強度と強化材の効果(S28-2 粉末成形とその評価(2),S28 粉末成形とその評価)

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The effect of in-situ formation of reinforcing phase, Al_2O_3, on the mechanical properties of FeAl (Fe-40mol%Al) intermetallic alloy was studied. The in-situ FeAl composites containing Al_2O_3 were fabricated by mechanical alloying of elemental powders and mill scale powder followed by vacuum hot pressing. The starting powders were mixed to be the appropriate ratios to synthesize the certain fraction of reinforcement and the matrix. The Fe_3AlC was formed simultaneously during the fabrication process because of the process control agent. The resultant FeAl+10vol% Al_2O_3+7.6vol%Fe_3AlC alloys showed high hardness value of HV797. This high hardness is due to the effect of (1) Al_2O_3 precipitation, (2) Fe_3AlC precipitation, (3) grain refinement, and (4) excessive thermal vacancy. In order to discuss these factors, we made FeAl+Fe_3AlC composite by using same fabrication procedure. Furthermore, prolonged low temperature anneal was performed to remove excessive thermal vacancy. It was not so effective to increase the strength of FeAl+Fe_3AlC composite in comparison with the structure refinement, nano meter sized matrix.
2005-09-18