(北京有色金屬研究總院 有色金屬材料制備加工國家重點實驗室，
北京 100088)
摘 要:
關(guān)鍵字: TA15 ELI鈦合金；疲勞裂紋；擴展速率；斷裂韌性；損傷容限
properties of ta15 eli titanium alloy
（State Key Laboratory for Fabrication and Processing of Non-ferrous Metals,
General Research Institute for Non-ferrous Metals, Beijing 100088, China）
Abstract:The damage tolerance behavior of TA15 ELI alloy 43 mm plates with equiaxed, bi-model and lamellae microstructure were studied, including tensile properties, fracture toughness and fatigue crack propagation behavior. The effects of microstructure of TA15 ELI alloy on the damage tolerance were discussed. The results show that the equiaxed and bi-modal microstructures have the similar mechanical properties and fatigue crack propagation rate. The plate with lamellae microstructure has higher fracture toughness about 111 MPa∙m1/2 and fatigue crack propagation resistance, and its strength lose is less compared with that of bi-modal microstructure, which indicates that the lamellar microstructure has better damage tolerance behavior.
Key words: TA15 ELI titanium alloy; fatigue crack propagation rate; fracture toughness; damage tolerance
