材料工程2024，Vol.52Issue(8)：130-141,12.DOI:10.11868/j.issn.1001-4381.2023.000221
不同变形方式β型Ti-Mo-Fe合金的低周疲劳性能
Low-cycle fatigue properties of β-type Ti-Mo-Fe alloys with different deformation modes
摘要
Abstract
The low-cycle fatigue (LCF) behavior of Ti-10Mo-xFe (x=1,2,3,mass fraction/％) alloys with different plastic deformation modes were investigated by OM,SEM,EBSD and electro-hydraulic fatigue test machine. The effects of the strain amplitudes (△εt/2=0.5％,1.0％ and 1.5％) and Fe content on the mechanical response,microstructures and fatigue crack propagation behavior were analyzed. The results show that the low-cycle fatigue performance of the alloys decreases with the increase of strain amplitude and Fe content. The cyclic stress response behaviors generally exhibit an initial cyclic hardening and then tend towards a cyclic stability or slight cyclic softening until fracture. The plastic deformation mode of Ti-10Mo-1Fe alloy is dominated by {332}<113>twinning,and changes to dislocation slip with the increase of Fe content. A few twins are formed in the fatigue initiation region of Ti-10Mo-1Fe alloy under low strain amplitude,and the twin area fraction increases gradually along the crack propagation direction,while a large number of twins are activated near the fracture area under high strain amplitude. The activation and intersection of abundant twins in Ti-10Mo-1Fe alloy divide the grain into network microstructures,which effectively release the stress concentration and delay the initiation of fatigue crack due to the dynamic microstructure refinement effect. At the same time,the abundant twin boundaries significantly extend the fatigue crack propagation path because the micro-crack deflects along the twin boundaries.关键词
β型钛合金/低周疲劳/孪生诱发塑性效应/{332}<113>孪生/位错滑移Key words
β-type titanium alloy/low-cycle fatigue/twinning-induced plasticity affect/{332}<113>twin/dislocation slip分类
矿业与冶金引用本文复制引用
李纵纵,闵小华,毛永换,姚凯..不同变形方式β型Ti-Mo-Fe合金的低周疲劳性能[J].材料工程,2024,52(8):130-141,12.基金项目
国家自然科学基金(52071051) （52071051）
