Abstract
The Ti-Al-Fe-V quaternary system is a very useful system for titanium alloy development. However, there are few reports on the thermodynamic description of this system. In the present work, the experimental investigation and thermodynamic description of the relative sub-systems of the Ti-Al-Fe-V quaternary system are summarized and reviewed, wherein the Ti-Fe-V system is re-assessed by using CALPHAD (CALculation of PHAse Diagrams) approach. The thermodynamic database of the Ti-Al-Fe-V quaternary system is established by extrapolating the thermodynamic descriptions of all sub- systems. Then, a method of titanium alloy design combining Mo equivalent with CALPHAD is proposed. The pseudo-binary sections with V:Fe = 3.5:1 and Al = 0.0, 3.0, 4.5 and 6.0 wt% are calculated. Finally, three different types of titanium alloys are recommended according to the new method.
Highlights
As important lightweight structural materials, titanium and titanium alloys are widely used in aviation, aerospace, vehicle engineering, biomedical engineering and other fields due to their excellent performance [1–3]
The cost of the related processing accounts for 60% of the total cost of commercial titanium alloys, while the raw materials account for 40% [8]
The ratio of V:Fe = 3.5:1 is recommended to design novel titanium alloys
Summary
As important lightweight structural materials, titanium and titanium alloys are widely used in aviation, aerospace, vehicle engineering, biomedical engineering and other fields due to their excellent performance [1–3]. The high production cost of titanium alloys limits their development and application. The low-cost preparation of titanium alloys and the development of low-cost titanium alloys have become the focus of research [5–7]. The cost of the related processing accounts for 60% of the total cost of commercial titanium alloys, while the raw materials account for 40% [8]. We can use inexpensive raw materials (alloying elements) to design titanium alloys. ATI company has developed ATI 425 low-cost titanium alloy using inexpensive Fe instead of part V [10], which reduces the cost, and reduces the possibility of the occurrence of brittle phase, this alloy keeps the good mechanical properties and can be applied to military armor materials.
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