Metallographic Preparation Procedure for Titanium Alloys

Titanium alloys refer to a variety of alloy metals made by mixing titanium with other metallic elements. Characterized by high strength, excellent corrosion resistance, and high heat resistance, titanium alloys are widely utilized in aerospace, marine, and chemical industries.

Classification by Microstructure

α Titanium Alloys (TA): Feature a stable microstructure with good toughness and stability; primarily used in the chemical and processing industries.

α+β Titanium Alloys (TC): Offer superior comprehensive mechanical properties, and their strength can be enhanced through heat treatment. This is the most widely used class of titanium alloys in industrial applications. For instance, TC4 and TC11 are critical structural components such as front journals, discs, blades, and front casings in aircraft engines.

β Titanium Alloys (TB): Exhibit excellent deformation processing properties, a good combination of strength and fracture toughness, and high resistance to stress corrosion. With their exceptional fatigue resistance, they are primarily applied in aircraft landing gears and medical fields.

Metallographic Challenges

The metallographic specimen preparation of titanium and titanium alloys is more difficult than that of steel, as their grinding and polishing efficiency is extremely low. Excessively aggressive sectioning and grinding processes can induce deformation twinning within the α phase.

Standard Reference: GB/T 5168-2020: Microstructures and macrostructures examination methods for titanium and titanium alloys.

A standard 3-step polishing method can achieve simple and highly efficient sample preparation.