Design of Low-Cost and High-Strength Titanium Alloys Using Pseudo-Spinodal Mechanism through Diffusion Couple Technology and CALPHAD |
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| Authors: | Chaoyi Ding Chun Liu Ligang Zhang Di Wu Libin Liu |
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| Affiliation: | 1.School of Material Science and Engineering, Central South University, Changsha 410083, China; (C.D.); (L.Z.);2.School of Mechanical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China;3.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China; |
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| Abstract: | The high cost of development and raw materials have been obstacles to the widespread use of titanium alloys. In the present study, the high-throughput experimental method of diffusion couple combined with CALPHAD calculation was used to design and prepare the low-cost and high-strength Ti-Al-Cr system titanium alloy. The results showed that ultra-fine α phase was obtained in Ti-6Al-10.9Cr alloy designed through the pseudo-spinodal mechanism, and it has a high yield strength of 1437 ± 7 MPa. Furthermore, application of the 3D strength model of Ti-6Al-xCr alloy showed that the strength of the alloy depended on the volume fraction and thickness of the α phase. The large number of α/β interfaces produced by ultra-fine α phase greatly improved the strength of the alloy but limited its ductility. Thus, we have demonstrated that the pseudo-spinodal mechanism combined with high-throughput diffusion couple technology and CALPHAD was an efficient method to design low-cost and high-strength titanium alloys. |
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| Keywords: | low-cost titanium alloy pseudo-spinodal mechanism CALPHAD diffusion couple 3D strength model |
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