Microstructural Evolution and Strengthening-Toughening Mechanisms of Cold-Rolled Ti-2Al-2.5Zr Titanium Alloy Tubes During Annealing AITranslate

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Chinese Library Classification Number:TG146.23[一般工业技术—材料科学与工程];TG156.2[金属学及工艺—金属材料]

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The effects of annealing process parameters(temperature and holding time)on the microstruc-ture and mechanical properties of cold-rolled Ti-2Al-2.5Zr titanium alloy tubes were systematically investi-gated using XRD,OM,SEM,EBSD,and tensile testing.The strengthening-toughening mechanisms of the annealed tubes were also analyzed.The results indicate that annealing at 700℃for 1.5~2.0 h leads to complete recrystallization of the cold-rolled tubes,resulting in a homogeneous fine-grained microstructure with an average grain size below 25μm.This microstructure exhibits a high yield strength of 436 MPa and a peak elongation of 27.5%.Grain refinement is identified as the dominant strengthening-toughening mechanismof the annealed tubes,leading to a significant enhancement of both strength and plasticity.Du-ring plastic deformation,the annealed tubes deform mainly via prismatic slip,complemented by pyramidal slip to accommodate strain.This study elucidates the microstructure-mechanical property relationship in annealed Ti-2Al-2.5Zr tubes,thereby providing a theoretical basis and process optimization guidelines for their application in nuclear and aerospace industries.