低弹bcc结构Ti-Mo-Nb-Zr固溶体合金的&ldquo;团簇+连接原子&rdquo;模型及其成分设计

马仁涛; 董闯; 王清; 郝传璞; 任明法; 王英敏

doi:10.3724/SP.J.1037.2010.00039

金属学报 >

2010 , Vol. 46 >Issue 9: 1034 - 1040

DOI: https://doi.org/10.3724/SP.J.1037.2010.00039

论文

低弹bcc结构Ti-Mo-Nb-Zr固溶体合金的“团簇+连接原子”模型及其成分设计

马仁涛 ,
董闯 ,
王清 ,
郝传璞 ,
任明法 ,
王英敏

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1) 大连理工大学三束材料改性教育部重点实验室, 大连 116024
2) 大连理工大学工业装备结构分析国家重点实验室, 大连 116024

马仁涛, 男, 1984年生, 硕士

收稿日期: 2010-01-21

修回日期: 2010-06-01

网络出版日期: 2010-09-11

基金资助

国家自然科学基金项目50901012和50631010及国家重点基础研究发展计划项目2007CB613902资助

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CLUSTER-PLUS-GLUE-ATOM MODEL AND COMPOSITION DESIGN OF BCC Ti-Mo-Nb-Zr SOLID SOLUTION ALLOYS WITH LOW YOUNG'S MODULUS

MA Ren-Shou ,
DONG Chen ,
YU Qing ,
HAO Zhuan-Pu ,
REN Meng-Fa ,
YU Yang-Min

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1) Key Laboratory of Materials Modification (Ministry of Education), Dalian University of Technology, Dalian 116024
2) State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024

Received date: 2010-01-21

Revised date: 2010-06-01

Online published: 2010-09-11

Supported by

Supported by National Natural Science Foundation of China (Nos.50901012 and 50631010) and National Basic Research Program of China (No.2007CB613902)

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摘要

利用“团簇+连接原子”结构模型研究了典型低弹bcc β-Ti固溶体合金的成分特征. 对现有低弹β-Ti固溶体合金的成分分析表明它们均满足团簇式[CN14团簇](连接原子)_x. 根据该式, 设计了Ti-Mo-Nb-Zr系列合金 [MoTi₁₄]Ti (质量分数表达时为Ti-11.8Mo), [MoTi₁₄]Nb (Ti-11.2Mo-10.8Nb), [MoTi₁₄]Nb₂ (Ti-10.1Mo-19.5Nb)和[Mo(Ti₁₃Zr)]Nb₂ (Ti-9.2Zr-9.6Mo-18.7Nb), 并采用Cu模吸铸快冷技术制备直径为3和6 mm的合金棒. 结果表明, 吸铸制备的合金均为bcc结构; 当连接原子由Ti变成更低弹的Nb时, 合金弹性模量降低; 低弹Zr替代Ti进一步降低了合金的弹性模量, [Mo(Ti₁₃Zr)]Nb₂ 合金的弹性模量E=72 GPa. 铸态样品经过固溶和水淬处理后弹性模量降低.

关键词： Ti-Mo-Nb-Zr合金; β-Ti固溶体; “团簇+连接原子”结构模型; 成分设计; 低弹性模量

本文引用格式

马仁涛 , 董闯 , 王清 , 郝传璞 , 任明法 , 王英敏 . 低弹bcc结构Ti-Mo-Nb-Zr固溶体合金的“团簇+连接原子”模型及其成分设计[J]. 金属学报, 2010 , 46(9) : 1034 -1040 . DOI: 10.3724/SP.J.1037.2010.00039

Abstract

The composition characteristics of typical bcc β-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 β-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]Nb₂ and [Mo(Ti₁₃Zr)]Nb₂, 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 β-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)]Nb₂ alloy. Solution treatment plus subsequent water quenching decreases slightly the Young's moduli of the suction-cast alloys.

Key words： Ti-Mo-Nb-Zr alloy; β-Ti solid solution; cluster-plus-glue-atom model; composition design; low Young's modulus

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