航空材料学报2024，Vol.44Issue(2)：176-183,8.DOI:10.11868/j.issn.1005-5053.2023.000154
一种高强钛合金疲劳裂纹扩展行为
Fatigue crack propagation behavior of high strength titanium alloy
摘要
Abstract
High strength Ti-5Al-3Mo-3V-2Zr-2Cr-1Nb-1Fe(Ti-5321)alloy is a new type of high strength tolerance titanium alloy designed and developed to meet the demand of high performance titanium alloy for new generation aircraft in China.Ti-5321 alloy with equiaxed microstructure(EM),basket-weave microstructure(BW)and fine basket-weave microstructure(F-BW)was obtained by forging and heat treatment,and the tensile properties and fatigue crack growth behavior were studied.Fatigue crack propagation mechanisms in Paris and unstable propagation regimes were revealed by analyzing the microstructures and fracture morphology using optical microscopy(OM)and scanning electron microscopy(SEM).The results show that the samples with EM,BW and F-BW exhibit the excellent fatigue crack propagation resistance with the tensile strength of 1200 MPa.The sample with F-BW presents the highest fatigue crack propagation resistance in Paris and rapid growth regimes,while the sample with EM presents the lowest fatigue crack propagation resistance.In F-BW,the crack mainly propagates through and along α phase.Crack tends to propagate across colony oriented for((1¯)011)<12(1¯)0>pyramidal slip and propagates along colony oriented for(10(1¯)0)<1(2¯)10>prismatic planes.关键词
Ti-5321合金/细网篮组织/断口形貌/疲劳裂纹扩展机制Key words
Ti-5321 alloy/fine basket-weave microstructure/fracture morphology/fatigue crack growth mechanism分类
矿业与冶金引用本文复制引用
王欢,辛社伟,郭萍,强菲,张磊,乔忠立,赵永庆..一种高强钛合金疲劳裂纹扩展行为[J].航空材料学报,2024,44(2):176-183,8.基金项目
国家科技部重点研发项目(2022YFB3705601) （2022YFB3705601）
陕西省博士后科研项目(2023BSHGZZHQYXMZZ30) （2023BSHGZZHQYXMZZ30）
