摘要
应用"团簇加连接原子"结构模型对镍基高温合金成分进行了解析,指出了这些合金均源自基础团簇式[Cr-Ni12]Cr3,其中[Cr-Ni12]为在FCC结构中以Cr为心的立方八面体团簇,搭配以3个Cr作为连接原子。根据合金化组元与基体Ni的混合焓大小确定其在团簇式中的位置,最终形成多元合金化后的团簇式[(Al/Ti/Nb)-(Ni/Fe/Co)12](Cr/Al)3。采用铜模吸铸快冷技术制备10 mm的合金棒,并对其在1373 K保温2 h后空冷。结果表明团簇式中含有一个Al时会有细小的γ'相析出,含有两个Al时[Al-(Ni10Fe2)](Cr2Al)合金中γ'相球形析出,粒子尺寸为30～60 nm;硬度测试表明前者强化效果不明显,后者由于γ'粒子长大使得合金硬度提高。当Al/Ti/Nb等比例占据团簇心部时,[(Al1/3Ti1/3Nb1/3)-(Ni10Fe2)]Cr3合金的硬度最高,为2.86 GPa。
：Composition of Ni-base superalloys was investigated using a cluster-plus-glue-atom model, then a basic Ni-Cr binary cluster formula [ Cr-Ni12 ] Cr3 was proposed where [ Cr-Ni12 ] cluster was a Cr-centered cuboctahedron surrounded by 12 Ni atoms in FCC lattice and three Cr atoms represented glue atoms. By alloying the basic cluster formula, Ni-base alloy series with a general cluster model [ （AI/ Ti/Nb）-（Ni/Fe/Co） t2] （Cr/A1）3 were designed. Φ10 mm alloy rods were prepared and heat-treated at 1373 K for 2 h. Experimental results show that the alloys with one A1 atom in cluster formula have extremely fine γ＇ particles precipitated in the T matrix which has a weak strengthening effect. In contrast, a lot of larger γ＇ particles with a size range of 30 - 60 nm precipitated in the [ AI-（ Ni10Fe2 ） ] （Cr2 A1） alloy with two A1 atoms, thus the hardnesses of the alloys are improved. That A1, Ti and Nb occupied the cluster center in equal proportion makes the [ （ Alt/3Ti1/3 Nbl/3 ） -（ Ni10 Fe2 ） ] Cr3 alloy have the highest hardness, being 2.86 GPa.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第8期184-188,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金资助项目(51171035
50901012)
作者简介
于晶晶（1987一），女，E—mail：flyjingjingyu@126．com。
通讯作者：王清，电话：0411-84708615，E-mail：wangq@dlut．edu．cn。
