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对一种新型高强β钛合金热处理过程中初生α相形貌演变和力学性能进行了研究。结果表明:新型合金α/β区双重固溶处理时初生α相在原有近球形晶粒基础上呈现球状生长;固溶后以0.5℃/min冷却速率炉冷,除部分初生α相依然保持近球状生长外,另有部分α相出现了α相端面的“叉型”结构定向生长特征。新型合金α/β区固溶后空冷+时效处理获得的细小等轴或短棒状初生α相与针状次生α相的混合组织具有优异的强-塑性匹配(抗拉强度1300 MPa,延伸率10.5%)。固溶后炉冷+时效处理的合金的抗拉强度为1000 MPa,延伸率为19%,断面收缩率为45%,且具有优异的断裂韧性(≥80 MPa·m~(1/2))。认为该合金是一种优良的结构材料。
The morphologies and mechanical properties of the primary α phase in the heat treatment of a new type of high strength β-titanium alloy were studied. The results show that the primary α phase in the α / β zone of the new alloy presents spherical growth on the basis of the original nearly spherical grains. After solution treatment, the primary α phase is cooled by the cooling rate of 0.5 ℃ / min, Spherical growth, while the other part of the α-phase appeared the “fork” structure directional growth characteristics. The new alloy α / β region after solution-air + aging treatment obtained fine equiaxed or short rod-like primary α phase and needle secondary α phase mixed organization has excellent strong - plastic matching (tensile strength 1300 MPa, elongation 10.5%). After cold-solution and aging treatment, the alloy has a tensile strength of 1000 MPa, an elongation of 19%, a reduction of area of 45%, and an excellent fracture toughness (≥80 MPa · m 1/2) . That the alloy is an excellent structural material.