AMS 4928: Aerospace Material Specifications for Titanium Bar Alloys.

AMS 4928 is a specification issued by the Society of Automotive Engineers (SAE) Aerospace Materials Specifications (AMS) committee. It specifically covers titanium alloy bars used in aerospace applications. Here's an overview of AMS 4928 and its relevance to titanium bar alloys:

1. Scope: AMS 4928 defines the requirements for titanium alloy bars used in aerospace structural applications. It includes specifications for the chemical composition, mechanical properties, heat treatment, testing, and certification of these materials.

2. Material Grades: The specification covers several grades of titanium alloy bars, each identified by a numerical designation (e.g., Ti-6Al-4V, Ti-6Al-6V-2Sn, etc.). These titanium alloys are commonly used in aerospace components due to their high strength-to-weight ratio, corrosion resistance, and other desirable properties.

3. Chemical Composition: AMS 4928 specifies the chemical composition limits for each grade of titanium alloy bars. This ensures that the material meets the required alloying element concentrations necessary to achieve the desired mechanical properties and performance characteristics.

4. Mechanical Properties: The specification defines the mechanical property requirements for titanium alloy bars, including tensile strength, yield strength, elongation, and hardness. These properties are critical for ensuring the structural integrity and performance of aerospace components under various operating conditions.

5. Heat Treatment: AMS 4928 may include requirements for heat treatment processes such as annealing, solution treatment, aging, or stress relief to achieve the desired microstructure and mechanical properties in the titanium alloy bars.

6. Testing and Inspection: The specification outlines the testing and inspection procedures required to verify compliance with the specified requirements. This may include methods for chemical analysis, mechanical testing, non-destructive testing (NDT), and dimensional inspection.

7. Certification and Marking: AMS 4928 requires manufacturers to provide certification and marking on titanium alloy bars to indicate compliance with the specification. This typically includes identifying the material grade, heat treatment condition, manufacturer's name or trademark, and relevant test results.

8. Application Guidelines: The specification may provide additional guidance or recommendations for the selection, processing, and use of titanium alloy bars in aerospace applications to ensure optimal performance and reliability.

Overall, AMS 4928 plays a crucial role in establishing the quality, consistency, and reliability of titanium alloy bars used in aerospace structural components. Manufacturers, suppliers, and users of these materials must adhere to the requirements outlined in the specification to ensure compliance and safe operation in aerospace systems.