相平衡分析在Nb-Si基高温合金制备中应用  

Application of phase equilibrium analysis in prepartion of Nb-Si based ultra-high temperature alloys

作　　者：耿太[1] 李长荣[1] 郭翠萍[1] 杜振民[1] 刘妙[1,2] 赵新青[3] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]中国人民解放军防化指挥工程学院,北京102205 [3]北京航空航天大学材料科学与工程学院,北京100191

出　　处：《材料热处理学报》2011年第2期157-161,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(50671009;50731002);教育部博士基金(20060008015)

摘　　要：在相平衡热力学计算的基础上,利用Scheil-Guilliver模型,计算了Nb-Si-Mo三元体系中不同成分合金的凝固途径。同时,根据Nb-Si-M(M=Ti、Mo、W、Al、Cr、B、Hf)三元系富Nb-M边的液相面投影图及相平衡关系,分析了各合金元素对Nb3Si相的稳定能力,以及对Nbss+Nb5Si3双相区的影响。计算结果与对应合金的显微组织分析相一致,表明相平衡分析有利于设计合金成分、模拟凝固过程、控制合金组织,对于Nb-Si基高温合金的设计与制备具有重要的指导意义。On the basis of phase equilibrium calculation,the solidification paths of Nb-Si-Mo ternary alloys with different compositions were simulated by Scheil-Guilliver model.In the meantime,according to the liquidus projections and phase equilibrium on the Nb-M rich side of the Nb-Si-M（M=Ti,Mo,W,Al,Cr,B,Hf） ternary system,the effects of alloying elements on stability of phase Nb3 Si and the region of the two-phase Nbss ＋ Nb5 Si3 were analyzed.The calculated results are consistent well with the microstructure observed by experiments,indicating that the phase equilibrium analysis is helpful to composition design,solidification simulation and microstructure control of the Nb-Si-based ultra-high temperature resistent alloys.

关 键 词：Nb-Si基高温合金 相平衡分析 凝固过程模拟 显微组织控制 

分 类 号：TG132.3[一般工业技术—材料科学与工程]