【摘要】 沿Ti9(Ni,Co) 4 Zr变电子浓度线设计系列合金成分,用吸铸方法可制备出Ti Zr (Ni,Co)准晶,其中Ti4 2 Zr4 0 (Ni,Co) 1 8为形成准晶的最佳成分点,Ti Zr (Ni,Co)伪三元准晶系列的准点阵常数介于0 5 0 6～0 5 18nm之间。实验结果表明,Co是形成准晶的不利组元,其含量的增加将促使Ti2 Ni、fcc Zr2 Ni和βZr(Ti)固溶相的形成,使合金中准晶相的含量大为降低;但适量Si的加入(～2at% )能促进Ti Zr (Ni,Co)准晶的形成。更多还原

【Abstract】 In a series of alloys along a Ti 9(Ni,Co) 4-Zr e/a-variant line prepared by suction casting, icosahedral quasicrystals were obtained with quasilattice constant 0.506～0.518nm. Experimental results show that in the Ti-Zr-(Ni,Co) pseudo-ternary system, the Ti 42 Zr 40 (Ni,Co) 18 alloy is optimal for quasicrystal formation, and increasing Co content contributes to the formation of Ti 2Ni, fcc-Zr 2Ni and β-Zr(Ti) phases, and greatly decreases the fractions of quasicrystals in the alloys, suggesting that Co is unfavorable for Ti-Zr-(Ni,Co) quasicrystal formation. However, the addition of 2 at% Si significantly improves the quasicrystal-forming ability.更多还原