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Materials 2018, 11(9), 1603; https://doi.org/10.3390/ma11091603

Optimal Design of High-Strength Ti‒Al‒V‒Zr Alloys through a Combinatorial Approach

1
School of Material Science and Engineering, Central South University, Changsha 410083, China
2
Key Laboratory of Non-Ferrous Metallic Materials Science and Engineering, Ministry of Education, Changsha 410083, China
3
School of Metallurgy and Environment, Central South University, Changsha 410083, China
4
State Key Laboratory of Powder Metallurgy, Changsha 410083, China
*
Authors to whom correspondence should be addressed.
Received: 13 August 2018 / Revised: 25 August 2018 / Accepted: 27 August 2018 / Published: 4 September 2018
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

The influence of various Zr contents (0–45 wt.%) on the microstructure and mechanical properties of Ti6Al4V alloy was investigated through a combinatorial approach. The diffusion multiples of Ti6Al4V–Ti6Al4V20Fe–Ti6Al4V20Cr–Ti6Al4V20Mo–Ti6Al4V45Zr were manufactured and diffusion-annealed to obtain a large composition space. Scanning electron microscopy, electron probe micro-analysis, and a microhardness system were combined to determine the relationships among the composition, microstructure, and hardness of these alloys. The Ti–6Al–4V–30Zr alloy was found to contain the thinnest α lath and showed peak hardness. X-ray diffraction and transmission electron microscope results indicated that after quenching from the β-field, the metastable α″-phase formed; moreover, at the secondary aging stage, the metastable α″-phase acted as precursor nucleation sites for the stable α-phase. The bulk Ti6Al4V30Zr alloy was manufactured. After aging at 550 °C, the alloy showed excellent balance of strength and ductility, and the tensile strength was 1464 MPa with a moderate elongation (8.3%). As the aging temperature increased, the tensile strength and yield strength of the alloys rose, but the total elongation decreased. The lamella thickness and volume fraction of the α-phase were the major factors that had great impacts on the mechanical properties. View Full-Text
Keywords: combinatorial alloy design; diffusion multiple; Ti6Al4VxZr; microstructure and mechanical properties; phase transformation combinatorial alloy design; diffusion multiple; Ti6Al4VxZr; microstructure and mechanical properties; phase transformation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Wu, D.; Tian, Y.; Zhang, L.; Wang, Z.; Sheng, J.; Wang, W.; Zhou, K.; Liu, L. Optimal Design of High-Strength Ti‒Al‒V‒Zr Alloys through a Combinatorial Approach. Materials 2018, 11, 1603.

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