【摘要】 研究了一种新型Ti-Al-Cr-Mo-W系高强、高韧β钛合金显微组织与力学性能的关系。结果表明,相变点之下固溶时效处理得到的含有等轴或短棒状初生α、细小片层次生α的混合组织的强度超过1400 MPa,断裂韧性达到50.7 MPa·m^1/2,该性能表明合金与同类高强钛合金相比具有更优异的强-韧性匹配。β区固溶缓冷处理得到的魏氏组织相比于混合组织具有较低的强度和较高的韧性。更多还原

【Abstract】 A new high strength titanium alloy containing elements Cr, Fe, Mo, W and Al was designed in order to achieve an excellent combination of ultra-high strength and good fracture toughness. Both the α/β and β heat treatment were introduced to study the effect of microstructure on mechanical properties of the alloy. The result shows that the alloy with α/β solution plus aging treatment is composed of mixture microstructures including a few equiaxed or short billet-like primary α phase and fine lamellar secondary α phase. The alloy has an excellent combination of ultra-high strength and good fracture toughness. The corresponding tensile strength exceeds 1400 MPa and fracture toughnesses K_IC is up to 50.7 MPa·m1/2. Compared with the alloy after α/β heat treatment, the alloy with β region heat treatment presents representative Widmanstatten structure which has higher fracture toughnesses and lower strengths than the bimodal microstructure.更多还原