Molybdenum foil exhibits moderate ductility, with an elongation of 10-20%, supporting some forming processes but with poor low-temperature toughness, requiring optimized processing to meet application needs. 1) Elongation: Hot-rolled foil achieves 15-20% elongation, offering good toughness for complex forming, like aerospace parts; cold-rolled foil, due to work hardening, has 5-10% elongation, with high strength (800-1000 MPa) but lower toughness, prone to brittle fracture. 2) Influencing Factors: Annealing (800-1200°C) relieves internal stress, restoring elongation to 15-20% and improving toughness; high-purity foil (≥99.95%) has fewer grain boundary defects, ensuring stabler ductility; low-purity foil (<99%) may have reduced ductility due to impurities. 3) Temperature Effects: Ductility is limited at room temperature, with brittle fracture risk below 0°C; above 1000°C, ductility improves, aiding hot forming. 4) Processing: Cold rolling refines grains, reducing ductility; hot rolling yields larger grains, enhancing ductility. 5) Applications: Ductility supports forming for semiconductor substrates, vacuum furnace heating strips, and molds. Oxidation above 600°C, forming MoO₃, requires vacuum protection to maintain performance. Ductility is tested via tensile tests, with ±0.5% precision. Quality control uses microscopic analysis and mechanical testing to meet electronics and aerospace demands, balancing strength and ductility.
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