Molybdenum foil exhibits good fatigue resistance, maintaining a long service life under cyclic loading, suitable for dynamic stress environments. Fatigue resistance refers to a material’s ability to resist crack initiation and propagation under repeated alternating stress. The fatigue strength of molybdenum foil is approximately 50% of its tensile strength, around 250-350 MPa at room temperature (tensile strength 500-700 MPa), enabling it to endure millions of stress cycles without failure. Cold-rolled foil, with finer grains and work hardening, has slightly higher fatigue strength but may develop cracks due to microscopic defects; annealed foil, with optimized crystal structure, offers longer fatigue life. High-purity molybdenum (99.95%) reduces crack initiation sites, enhancing fatigue performance. Temperature significantly affects fatigue: at high temperatures (above 1000°C), strength decreases, and fatigue limit drops to 50-100 MPa, requiring careful load design. In high-temperature furnaces and aerospace components (e.g., turbine blade supports), molybdenum foil’s fatigue resistance supports vibration and thermal cycling. Surface quality is critical; polished foil reduces defects, extending fatigue life. Oxidation above 600°C may cause surface microcracks, reducing fatigue resistance, so use in vacuum or inert gas is recommended. Processing, purity, and environmental control are key to optimizing fatigue performance. Molybdenum foil’s fatigue resistance ensures reliability in dynamic high-temperature applications, provided stress concentrations are minimized.
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