Both zirconium and silicon zirconium have a homogeneous transformation, the high-temperature phase is β-Zr with a body-centered cubic structure, and the low-temperature phase is α-Zr with a close-packed hexagonal structure. The transition temperature of silicon zirconium is 862℃. The transformation temperature of alloys and industrial zirconium is affected by alloying elements and impurity elements: the addition of iron, nickel, chromium, and niobium reduces the α-Zr phase region, which reduces the transformation temperature; oxygen, nitrogen, and tin expand the α-Zr phase region, so that The transition temperature increases.
Zr-2.5Nb alloy has obvious quenching strengthening effect. This alloy is heated to the β area or (α+β) high temperature area. After quenching in water, the tensile strength at room temperature can reach 90 kgf/mm2; after quenching, the alloy is subjected to proper aging treatment at 500°C, and its strength does not decrease. , But the plasticity is significantly improved. This solution-aging alloy has relatively good corrosion resistance.
