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添加釔對TiAl合金組織和性能的影響

Effects of Y-Addition on Microstructure and Mechanical Properties of TiAl -Base Alloys

  • 摘要: 設計并熔煉了成分為(Ti50Al50)100-xYx(x(atom)=0~2.0%)的合金,用金相顯微鏡、掃描電鏡、三點彎曲試驗等手段,研究了添加釔(Y)對TiAl合金顯微組織和力學性能的影響。結果表明:釔的添加能改變TiAl合金顯微組織,使γTiAl合金晶粒細化,促進γ+α2片層狀組織的形成。適量釔的添加能降低TiAl合金中O、N等間隙原子含量并增加TiAl合金的室溫抗彎強度和塑性;當釔的添加量超過其在TiAl合金中的固溶度時,將形成新的Ti-Al-Y三元化合物,反而會降低TiAl合金的室溫強度和塑性。

     

    Abstract: (Ti50Al50)100-xYx ternary alloys with various Y content(x(atom)=0~2.0%) were designed and smelt.The effect of Y-addition on microstructure and mechanieal properties of TiAl alloys are investigated by metallography,scanning electron microscope,3-point bending tests and so on.The results show that the Y-addition can change the microstructure of TiAl alloys such as fining the grain size of γTiAl and promoting the formation of γ+α2 lammellar structure;Y in suitable addition amount can absorb interetitial atoms such as O and N and improve strength and ductility of TiAl alloys at ambient temperature;The strength and ductility of TiAl alloys will decrease because of the formation of new ternary compounds when Y-addition amount exceeds its solid solubility in TiAl alloys.

     

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