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采用纳米压痕和原子力显微镜对Nb-21Ti-4C-x Al(x:0,5,10,15 at%,下同)、Nb-35Ti-4C及Nb-25Ti-8C合金Nbss、(Nb,Ti)C、Nb3Al及相界面的力学性能和变形行为进行了研究。研究表明:Ti、Al元素合金化能有效提高Nbss的硬度,且Al强化效果优于Ti;高硬度的碳化物、Nb3Al与Nbss界面结合良好是理想的增强相。热处理后(Nb,Ti)C内部析出二次Nbss,改善了碳化物的变形行为,提高了韧性;热处理后Nbss内部组织均匀化及位错密度降低导致Nbss硬度下降。Ti、Al、C原子含量变化及热处理对Nbss的弹性模量影响不大。
The Nb-21Ti-4C-xAl (x: 0,5,10,15 at%, the same below), Nb-35Ti-4C and Nb-25Ti-8C alloys Nbss, Ti) C, Nb3Al and their mechanical properties and deformation behavior were studied. The results show that the alloying of Ti and Al can effectively increase the hardness of Nbss, and the strengthening effect of Al is superior to that of Ti. The combination of high hardness carbide and Nb3Al with Nbss is the ideal reinforcing phase. After heat treatment, Nbss is precipitated in the interior of (Nb, Ti) C, the deformation behavior of carbides is improved and the toughness is improved. The homogeneity of Nbss internal structure and the decrease of dislocation density decrease the hardness of Nbss after heat treatment. Ti, Al, C atomic content changes and heat treatment have little effect on the elastic modulus of Nbss.