Journal of Surface Science and Technology

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The Effects of Nb and Mo Addition on Microstructure and Mechanical Behaviour of Ti-6Al-4V Alloy


Affiliations
1 Laboratoire de de Genie des Procedes, Universite Amar Telidji – Laghouat, B.P. 37G Laghouat 03000, Algeria
2 Laboratoire de de Sciences Fondamentales, Universite Amar Telidji – Laghouat, B.P.37G Laghouat 03000, Algeria
3 Departamento de Ciencia e Ingenieria de Materiales, Carlos III Universidad, 30, 28911 Leganes, Madrid, Spain
     

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The effects of Nb and Mo addition, with different contents, on the microstructure and some mechanical properties of Ti-6Al-4V alloy were investigated. Treatments were performed at various high temperatures about 1200 and 1300 °C for 3h using vacuum furnace as first treatment and using an argon atmosphere as second treatment. The samples were characterized by X-ray diffraction and the influence of processing temperature on microstructure was studied, the microstructural evolution was evaluated by optical microscopy and SEM. The results revealed that the Nb and Mo elements added to the titanium alloy stabilized the β phase and changed the lattice parameters of α phase. Microstructural observations, phase analysis shown that Ti-6Al-4V alloy contain single phase and increasing Nb and Mo contents the equiaxed grain is refined, and reduction in the prior β grain size. Moreover, Nb/Mo addition up to 10 wt.% increases the volume fraction of β phase in the microstructure. Some mechanical properties such as hardness, Young's modulus and fracture toughness were achieved and tensile test was performed at room temperature. Experimental results revealed good mechanical properties including a low Young's modulus and high deformability, the hardness values of the alloy is about 350-570 HV and the fracture toughness values KIC are ranging from 16.8 MPa m1/2 to 28.5 MPa m1/2 depending on Nb/Mo contents.

Keywords

Molybdenum, Microstructure, Microhardness, Niobium, Ti-6Al-4V Alloy, Young’s Modulus.
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  • The Effects of Nb and Mo Addition on Microstructure and Mechanical Behaviour of Ti-6Al-4V Alloy

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Authors

A. Kaouka
Laboratoire de de Genie des Procedes, Universite Amar Telidji – Laghouat, B.P. 37G Laghouat 03000, Algeria
K. Benarous
Laboratoire de de Sciences Fondamentales, Universite Amar Telidji – Laghouat, B.P.37G Laghouat 03000, Algeria
A. Daas
Laboratoire de de Genie des Procedes, Universite Amar Telidji – Laghouat, B.P. 37G Laghouat 03000, Algeria
S. A. Tsipas
Departamento de Ciencia e Ingenieria de Materiales, Carlos III Universidad, 30, 28911 Leganes, Madrid, Spain

Abstract


The effects of Nb and Mo addition, with different contents, on the microstructure and some mechanical properties of Ti-6Al-4V alloy were investigated. Treatments were performed at various high temperatures about 1200 and 1300 °C for 3h using vacuum furnace as first treatment and using an argon atmosphere as second treatment. The samples were characterized by X-ray diffraction and the influence of processing temperature on microstructure was studied, the microstructural evolution was evaluated by optical microscopy and SEM. The results revealed that the Nb and Mo elements added to the titanium alloy stabilized the β phase and changed the lattice parameters of α phase. Microstructural observations, phase analysis shown that Ti-6Al-4V alloy contain single phase and increasing Nb and Mo contents the equiaxed grain is refined, and reduction in the prior β grain size. Moreover, Nb/Mo addition up to 10 wt.% increases the volume fraction of β phase in the microstructure. Some mechanical properties such as hardness, Young's modulus and fracture toughness were achieved and tensile test was performed at room temperature. Experimental results revealed good mechanical properties including a low Young's modulus and high deformability, the hardness values of the alloy is about 350-570 HV and the fracture toughness values KIC are ranging from 16.8 MPa m1/2 to 28.5 MPa m1/2 depending on Nb/Mo contents.

Keywords


Molybdenum, Microstructure, Microhardness, Niobium, Ti-6Al-4V Alloy, Young’s Modulus.

References





DOI: https://doi.org/10.18311/jsst%2F2017%2F11026