EFFECTS OF Cr AND Nb ON MICROSTRUCTURES AND MECHANICAL PROPERTIES OF Fe_3Al ALLOYS

Abstract

Abstract: The effects of Cr and Nb on tensile properties at room and elevated temperatures and also on the microstructure have been investigated.An improvement in ductiliy plasicity and the cleavage strength of Fe_3AI may result from adding Cr;the improvement is more pronounced at over 400℃.The formation of Fe_2Nb 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℃.

Key words: intermetallic compound, Fe_3Al alloy, mechanical properties, Cr, Nb

SUN Chao GUO Jianting TAN Minghui LI Hui WANG Shuhe Institute of Metal Research,Academia Sinica,Shenyang,China professor,Institute of Metal Research,Academia Sinica,Shenyang 110015,China. EFFECTS OF Cr AND Nb ON MICROSTRUCTURES AND MECHANICAL PROPERTIES OF Fe_3Al ALLOYS[J]. Acta Metallurgica Sinica (English Letters), 1993, 6(3): 157-160.

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EFFECTS OF Cr AND Nb ON MICROSTRUCTURES AND MECHANICAL PROPERTIES OF Fe_3Al ALLOYS

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