What is the difference between TC4 titanium alloy and TC4ELI titanium alloy?
TC4 titanium alloy
TC4 titanium alloy is a type α - β titanium alloy successfully developed by the United States in 1954, which contains 6% α stable element and 4% β stable element V. The aluminum equivalent of the nominal component of TC4 titanium alloy is 7.0, the molybdenum equivalent is 2.9, and the annealed state contains 10% -15% β phase. Al improves the room temperature strength and thermal strength in the α phase of the alloy in Ti-Al-V series, and V is one of the few alloy elements in titanium alloy that can improve both strength and plasticity. The favorable effect of V on the plasticity of titanium alloy is because it does not increase the ratio of lattice c / a axis in the α state like most alloy elements, but reduces the ratio, thus improving the formation of α phase and avoiding the alloy embrittlement in the process of long-term use.
The main characteristics of TC4 titanium alloy are its excellent comprehensive performance and good process performance. TC4 titanium alloy has moderate room temperature strength and high temperature strength, good creep resistance and thermal stability, high fatigue resistance and crack extension resistance in seawater, satisfactory fracture toughness and corrosion resistance, the sensitivity to hydrogen is smaller than TC2 and TC1 alloy, suitable for the manufacture of various parts working in a wide temperature range of-196~450℃, especially those designed by the principle of damage capacity limit. TC4 titanium alloy also has excellent process plasticity and super plasticity, suitable for using a variety of pressure processing methods for forming, and using various ways for welding and machining.
The main semi-finished products of TC4 titanium alloy are bars, forgings, sheet, thick sheet, profile and wire, etc., which are also used in castings (ZTC 4).
TC4ELI Titanium alloy
TC4ELI Is an improved type of TC4, whose main differences are different Al content and lower content of gap elements Fe, N, H, and O.
TC4ELI Titanium alloy has become an ideal material for medical surgical implants due to its advantages of good biocompatibility, low elastic modulus, low density, good anticorrosion properties, non-toxic, high yield strength, long fatigue life, large plasticity at room temperature, and easy forming. Medical TC4ELI titanium alloy plate is mainly used for skull repair, bone grafting and other aspects, which has higher requirements for its strength, fatigue life, plasticity and so on.
Titanium alloy is an alloy composed of titanium elements based on other elements. Titanium has two kinds of homogenous crystals: titanium is an isomer, melting point of 1668℃, below 882℃, called α -titanium; above 882℃, called β -titanium. Using the different characteristics of the above two structures of titanium, the appropriate alloy elements are added, making the phase change temperature and composition content gradually change, and get the titanium alloy (titanium alloys) of different tissues.
And the content of Fe, the strength is reduced, but can significantly improve the toughness. TC4 ELI With good plasticity, toughness, good welding performance and low temperature performance, widely used in low temperature engineering, medical treatment, ships and aircraft and other important fields.
TC4 alloy can be used in ordinary environment or high temperature environment, TC4ELI combined
