【摘 要】
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The influences of alloying elements W, Mo, Cr, and Nb on retainedβ phase in 47Al based near γ-TiAl alloys have been studied.The results reveal that the amount
【机 构】
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Institute of Metal Research
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The influences of alloying elements W, Mo, Cr, and Nb on retainedβ phase in 47Al based near γ-TiAl alloys have been studied.The results reveal that the amount of retained β phase is increased by the addition of Cr, Mo, W in rising rank, although the distribution of β phase in Cr-bearing alloys is different from that of Mo- or W-bearing alloys. For Nb-doped alloys, no retained β was found even when 5 at. pct Nb was added. The as-cast microstructural features and the distribution of theβ phase in the different alloy families were compared and interpreted in terms of the different segregation behaviour of these elements in Ti.
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