Abstract:
(Ti
50Al
50)
100-xY
x 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.