Titanium alloys are alloys that contain a mixture of titanium and other chemical elements. Such alloys have very high tensile strength and toughness (even at extreme temperatures). They are light in weight, have extraordinary corrosion resistance and the ability to withstand extreme temperatures.
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Advantages of Titanium alloy
One of the natural advantages of Titanium lies in its exceptional strength. This particular metal is renowned for its exceptional strength and durability, making it highly advantageous in a wide range of manufacturing contexts.
Titanium exhibits the most favorable strength-to-density ratio among all metallic elements listed in the periodic table, thereby highlighting its natural benefits.
Unalloyed titanium exhibits comparable strength to steel, yet possesses a lower density, rendering it a highly favored option among numerous professionals.
Titanium's strong resistance to oxidation and corrosion is a major benefit. Metal erodes when exposed to dampness because of a chemical reaction called oxidation. Whether placed indoors or out, it will resist rust and corrosion for a long time.
Titanium is a versatile metal that is used in everything from airplanes and cars to boats and pacemakers.
Titanium exhibits corrosion resistance, thereby indicating its ability to resist the effects of oxidation and degradation when subjected to environmental conditions.
Titanium exhibits biocompatibility, rendering it suitable for utilization in medical implants and other devices that interface with the human body.
Titanium exhibits non-toxic properties and does not emit hazardous substances when subjected to heat or combustion.
Titanium's remarkable strength-to-weight ratio makes it a versatile metal that is both durable and easy on the body.
Titanium alloys are classified into three different categories. These are differentiated according to the phase composition.
Un Alloyed Grades Or Alpha Alloys
Commercially pure or unalloyed titanium is characterized by a titanium content of more than 99 %. The main alloying element is oxygen, which determines the strength. A higher content of oxygen means that the strength and hardness increases as well. Alpha alloys are usually only consisting of α-phase. Due to impurities, however, small amounts of β-phase are possible.
Unalloyed titanium grades show great mechanical properties, such as very good corrosion resistance and high ductility and formability.
However, the strength is relatively low compared to other titanium alloy grades. Further, alpha alloys can not be heat treated to increase strength.
Examples of unalloyed grades are ASTM grade 1, 2, 3 and 4.
Near Alpha Aloys
In contrast to alpha alloys which entirely consist of α-phase, near alpha alloys contain a small amount of ductile β-phase. To stabilize α-phase, alloys such as aluminium are added. Moreover, alloys such as molybdenum or vanadium are used as β-phase stabilizers. The content of these is about 1-2 %.
Near alpha alloys show good mechanical properties, suc as high toughness, good creep resistance and weldability. However, the mechanical strength is only moderate and increases with the aluminum content.
Examples of near alpha alloys include Ti-6Al-2Sn-4Zr-2Mo and Ti-5.5Al-3.5Sn-3Zr-1Nb.
Al Pha Beta Alloys
Alpha-beta alloys consist mainly of Ti-(4-6)Al combined with contents between 4 % and 5 % of β-stabilizer elements. These include elements such as tungsten, molybdenum, vanadium and aluminum. Therefore, alpha-beta alloys consist of a mixture of α and β phases.
Alpha-beta alloys can be heat treated. This results in a significant increase in strength, especially when precipitation hardening is applied. However, the heat treatment leads to a decrease in ductility.
Overall, alpha-beta alloys show high tensile and fatigue strength. Also, they are characterized by good hot formability and acceptable creep resistance.
Examples of alpha-beta alloys include Ti-6Al-4V (Grade 5), which makes up half of the total production of titanium alloys.
Beta Titani Um Alloys
Beta titanium alloys are rich in β-phase. This is ensured by adding enough β-phase stabilizers such as molybdenum and vanadium. In this way, it is possible to maintain the β-phase after quenching.
Like alpha-beta alloys, beta alloys can be heat and solution treated. Therefore, they can possess high strength and great formability.
However, the fatigue strength and ductility are low.
Examples of beta titanium alloys include Ti-10V-2Fe-3Al, Ti-13V-11Cr-3Al and Ti-15-3.
Grades of Titanium Alloys With Properties and Applications
Titanium alloys are available in a wide range of grades, each with its specific properties. The following are some of the most common titanium alloy grades.
Grade 5 Titanium Alloy
- Grade 5 is the most common titanium alloy due to its high strength. It is a commonly welding alloy that can function in structural and pressure-containing components. It has high corrosion resistance in both oxidizing and reducing environments.
- In addition, it also finds use in the chemical and petroleum industries and the fabrication of offshore drilling platforms. The alloy functions in constructing water treatment facilities, nuclear reactors, and other critical environments requiring a high-strength, low-cost material.
Grade 6 Titanium Alloy
Grade 6 is a commonly welded titanium alloy containing aluminum and tin often used for components exposed to elevated temperatures. In addition to its high-strength properties, the alloy has excellent stability, making it a good choice for airframes and jet engines.
Grade 7 Titanium Alloy
Grade 7 titanium alloy is especially useful for low temperatures and pH applications. This is a result of its extreme corrosion resistance.
Grade 11 Titanium Alloy
- Grade 11 is a titanium alloy with good high-temperature strength and high corrosion resistance. The alloy is a raw material for components operating in high temperatures, such as chemical and petroleum processing equipment and manufacturing aircraft engines and airframes. Grade 11 is also used to manufacture turbines, liquid hydrogen storage tanks, and other critical equipment. The alloy is easily fabricated by machining, forging, rolling, and extruding.
Grade 12 Titanium Alloy
- It applies to manufacturing aircraft components, such as engine parts, airframes, landing gear, fuel systems, and other critical equipment. The alloy is also used to manufacture cryogenic vessels, heat exchangers, distillation columns, and other equipment operating at high temperatures.
- In addition, grade 12 is easily fabricated by machining, forging, rolling, and extruding. Therefore, it is ideal for the manufacture of valves, fittings, and other equipment requiring corrosion-resistant materials.
Grade 23 Titanium Alloy
Grade 23 is a titanium alloy with good ductility and fracture toughness. It functions mostly in the manufacture of medical implants.
The difference in material properties across different titanium alloys arises from their compositions. The elements added to the titanium base can significantly influence the resulting alloy. For instance, when vanadium and aluminium are used as alloying elements, the result is Ti-6Al-4V, a powerful and sturdy alloy. Other alloying additions used frequently to modify the properties of titanium alloys include molybdenum, iron, manganese, and chromium.
|
Alloy |
Chemical composition |
|
Ti-6Al-4V |
90% Titanium, 6% Aluminium, 4% Vanadium |
|
Ti-5Al-2.5Sn |
92.5% Titanium, 5% Aluminium, 2.5% Tin |
Physical Characteristics of Titanium Alloy
Understanding the physical characteristics of titanium alloy, such as its density and melting point, provides further insight into why it's so beneficial in engineering contexts. For instance, it offers a density of around 4500 kg/m3, significantly less than other common engineering materials like steel and copper. Additionally, its melting point is quite high, ranging from 1660°C to 3287°C, depending on the specific alloy type.
Understanding Hardness Testing for Titanium Alloys
One of the compelling reasons why you might want to understand hardness testing for titanium alloys lies in their diverse utilization. From the aerospace industry where these alloys form the backbone of aircraft frame construction, to the biomedical field where they are used for creating implants, the hardness of the material can significantly impact their performance.
Hardness testing functions on a simple premise – it gauges the resistance of the material to indentation under a standard force. A typical hardness test involves the use of a small indenter that is forced onto the surface of the sample material under a specific load. There are two commonly used hardness testing methods for titanium alloys: Brinell hardness test and Rockwell hardness test.
Alternatively, the Rockwell hardness test, also a common method, uses a small diamond cone as an indenter which leaves a much smaller imprint than the Brinell test. The hardness number is calculated using a formula that includes the depth of indentation, measurement taken after removing the major load, but while the minor load is still applied.
Where: -
Is the depth of indentation (in mm) -
Is a number depending on the scale of the test (150 for scale C) -
Is constant depending on the scale of test (0.002 mm for scale C)
Machinability of Titanium Alloys
When discussing the characteristics of titanium alloys, their machinability - how easily they can be cut and shaped into the desired form - plays a crucial role in determining their various applications.
Titanium alloys, renowned for their high strength-to-weight ratio, corrosion resistance, and high-temperature stability, serve a wide range of industries.
Nevertheless, machining these alloys can be a real challenge, given their distinct properties. The primary machining processes used for titanium alloys include:
Turning: A process where the workpiece rotates while the cutting tool moves in a linear motion. It's primarily used to create cylindrical shapes.
Milling: Here, the workpiece stays stationary, and the cutting tool rotates on its axis to remove material. It's used to produce slots, flat surfaces, or complex contours.
Drilling: To make holes in the titanium alloy piece, drilling comes into play. It involves a rotating tool that makes round holes.
Grinding: An abrasive machining process using a grinding wheel as the cutting tool. It's used for finishing purposes, delivering highly accurate dimensions and fine surface finish.
Of these, turning and milling are the most common and extensively used. However, care should be taken while machining titanium alloys. These alloys can quickly wear out cutting tools and generate a lot of heat, which may affect the alloy's mechanical properties.
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Located in Baoji, Shaanxi province, known as China's Titanium Valley, Baoji West Titanium Materials Co., Ltd (West-Ti) was established in 2019 with a registered capital of 60 million yuan. The company was merged with Baoji Hongyuan Titanium Industry Co., Ltd. and Baoji Overflow Industrial Co., Ltd, both companies have more than 20 years of experience in the titanium industry. In 2019, the jointly established Baoji West Titanium Materials Co., Ltd business covers the processing and sales of rare metals such as titanium coil, plate, bar, wire, and titanium forging.
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