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The effects of Cr and Nb on tensile properties at room and elevated temperatures and also onthe microstructure have been investigated.An improvement in ductiliy plasicity and thecleavage strength of Fe_3AI may result from adding Cr;the improvement is more pronouncedat over 400℃.The formation of Fe_2Nb containing A1 precipitates in the Fe_3AI+Nb alloyprovide significant strengthening effect.Additions of Cr and Nb in Fe_3AI can cause a signifi-cant improvement in the yield strength at 550℃.
The effects of Cr and Nb on tensile properties at room and elevated temperatures and also on the microstructure have been investigated. Improvement in ductiliy plasicity and the cleaning strength of Fe_3AI may result from adding Cr; the improvement is more pronounced at over 400 ° C. Formation Fe2Nb containing A1 precipitates in the Fe_3AI + Nb alloy provide significant strengthening effect. Additions of Cr and Nb in Fe_3AI can cause a signifi-cant improvement in the yield strength at 550 ° C.