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

doi:10.3724/SP.J.1037.2010.00039

Acta Metall Sin

2010, Vol. 46

Issue (9): 1034-1040 DOI: 10.3724/SP.J.1037.2010.00039

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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 Rentao¹⁾, HAO Chuanpu¹⁾, WANG Qing¹⁾, REN Mingfa²⁾, WANG Yingmin¹⁾, DONG Chuang¹⁾

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

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MA Rentao HAO Chuanpu WANG Qing REN Mingfa WANG Yingmin DONG Chuang. CLUSTER-PLUS-GLUE-ATOM MODEL AND COMPOSITION DESIGN OF BCC Ti-Mo-Nb-Zr SOLID SOLUTION ALLOYS WITH LOW YOUNG'S MODULUS. Acta Metall Sin, 2010, 46(9): 1034-1040.

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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

Received: 21 January 2010

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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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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00039 OR https://www.ams.org.cn/EN/Y2010/V46/I9/1034

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