CLUSTER-PLUS-GLUE-ATOM MODEL AND COMPOSITION DESIGN OF BCC Ti-Mo-Nb-Zr SOLID SOLUTION ALLOYS WITH LOW YOUNG'S MODULUS
CLUSTER-PLUS-GLUE-ATOM MODEL AND COMPOSITION DESIGN OF BCC Ti-Mo-Nb-Zr SOLID SOLUTION ALLOYS WITH LOW YOUNG'S MODULUS
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低杨氏模量BCC Ti-Mo-Nb-Zr固溶合金的簇加胶原子模型及成分设计
DOI：
10.3724/sp.j.1037.2010.00039
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发表时间：
2010-09-11
影响因子：
2.3
通讯作者：
Dong Chuang
中科院分区：
文献类型：
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作者：
Ma Rentao;Hao Chuanpu;Dong Chuang
采用团簇加胶原子模型，将合金结构分解为团簇部分和胶原子部分，即孤立的团簇与胶原子连接，分析了典型低杨氏模量bcc β-Ti固溶体合金的成分特征。这里的簇是最近邻配位多面体，配位数为14（CN 14）。证实了低杨氏模量β-Ti固溶体合金满足由该模型给出的一个普遍的团簇公式[CN 14团簇]（胶原子）（x）。用簇式[MoTi 14]Ti、[MoTi 14]Nb、[MoTi 14]Nb-2和[Mo（Ti 13 Zr）]Nb-2、Ti-11.8Mo描述的合金（质量分数，%）、Ti-11.2Mo-10.8Nb、Ti-10.1Mo-19.5Nb和Ti-9.2Zr-9.6Mo-18.7Nb合金，采用铜模吸铸法制备直径为3 mm和6 mm的合金棒材，分别这些吸铸合金具有整体bcc β-Ti结构。低模量Nb作为胶原子的引入削弱了团簇连接，降低了杨氏模量。用低模量Zr进一步取代使[Mo（Ti 13 Zr）]Nb-2合金中的杨氏模量降低至72 GPa。固溶处理加随后的水淬火稍微降低吸铸合金的杨氏模量。
The composition characteristics of typical bcc beta-Ti solid solution alloys with low Young's modulus were analyzed by using the cluster-plus-glue-atom model, in which an alloy structure is dissociated into a cluster part and a glue atom part, i.e. isolated clusters are linked with glue atoms. The cluster here is the nearest neighbor coordination polyhedron with a coordination number of 14 (CN14). It is confirmed that beta-Ti solid solution alloys with low Young's moduli satisfy a universal cluster formula [CN14 cluster](glue atom)(x), given by this model. Alloys, described by cluster formulas [MoTi14]Ti, [MoTi14]Nb, [MoTi14]Nb-2 and [Mo(Ti13Zr)]Nb-2, Ti-11.8Mo (mass fraction, %), Ti-11.2Mo-10.8Nb, Ti-10.1Mo-19.5Nb and Ti-9.2Zr-9.6Mo-18.7Nb were designed and the alloy rods with diameters of 3 and 6 mm were prepared by copper-mould suction-cast method, respectively. These suction-cast alloys possess monolithic bcc beta-Ti structure. The introduction of low-modulus Nb as glue atoms weakens the cluster linking and decreases the Young's modulus. Further substitutions with low-modulus Zr reduces the Young's modulus to 72 GPa in the [Mo(Ti13Zr)]Nb-2 alloy. Solution treatment plus subsequent water quenching decreases slightly the Young's moduli of the suction-cast alloys.