The Effect of in-situ Formation of Al_2O_3 or Fe_3AlC on the Structural and Mechanical Properties of FeAl Intermetallic Alloys

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The effect of in-situ formation of reinforcing phase on the mechanical properties of FeAl intermetallic alloy was studied. The in-situ FeAl composites containing Al_2O_3 or Fe_3AlC were fabricated by mechanical alloying of elemental powders and mill scale powder followed by vacuum hot pressing. The starting materials were mixed in the appropriate ratio to synthesize 10vol% of the reinforcing phase. FeAl+Al_2O_3 and FeAl+Fe_3AlC alloys showed high hardness value of HV813 and HV524, respectively. The effect of testing temperature on the 0.2% proof stress was evaluated at the temperature range from room to 1273K under compression. FeAl+Al_2O_3 and FeAl+Fe_3AlC alloy showed proof stress of 2240MPa and 1380MPa at room temperature, respectively. At higher temperatures above 773K the proof stress decreased rapidly. The FeAl base in-situ composites including Fe_3AlC or Al_2O_3 showed the high stress exponent arid activation energy in the temperatures range of 1073-1273K.
2006-04-15