氧含量及晶粒尺寸对Ti-Zr二元合金拉伸屈服行为的影响  

Effect of Oxygen Content and Grain Size on Tensile Yield Behavior of Titanium Zirconium Binary Alloy

作　　者：梁林弘 王宜平 王小祥[1] LIANG Linhong;WANG Yiping;WANG Xiaoxiang(School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学材料科学与工程学院,浙江杭州310027

出　　处：《材料科学与工程学报》2024年第1期21-26,83,共7页Journal of Materials Science and Engineering

基　　金：浙江省科技厅重点研发计划资助项目(2019C03081)。

摘　　要：对不同氧含量的温轧态Ti-Zr二元合金进行不同温度的退火及二次时效处理,发现氧含量与晶粒尺寸影响Ti-Zr合金表现出的拉伸屈服行为。通过拉伸试验、金相分析、透射电镜观察及应变时效和EDS元素分布研究了不同锆、氧含量钛合金的屈服延伸与微观组织的联系。研究结果表明:Ti-12Zr-0.25O合金在晶粒尺度处于1~15μm区间时,表现出典型的屈服延伸现象,随着晶粒尺寸增大,屈服延伸逐渐减弱;氧含量从0.1wt%增加至0.3wt%,Ti-12Zr合金表现出最大的上下屈服点应力差值及最大屈服点延伸率,分别为47MPa,5.2%;仅当锆、氧原子共同存在时,屈服延伸得到明显增强,以Ti-12Zr-0.25O尤甚。After annealing and secondary aging treatment at different temperatures,it was found that oxygen content and grain size would affect the yield behavior of Ti-Zr binary alloy with different oxygen contents.The relationship between yield point elongation and microstructure was studied by tensile tests,metallographic analysis,TEM observation,strain aging and EDS.The results showed that Ti-12Zr-0.25O alloy exhibited typical yield plateau phenomenon within the grain size range of 1-15μm,while the yield phenomenon faded gradually with the increase of grain size;with the increase of oxygen content from 0.1 wt%to 0.3 wt%,Ti-12Zr alloy showed the peak yield drop and yield point elongation,which were 47 MPa and 5.2%,respectively;only when Zr and O atoms coexisted would yield point elongation be significantly enhanced,Ti-12Zr-0.25O especially.

关 键 词：Ti-Zr二元合金 氧含量 晶粒尺寸 屈服行为 锆氧“协同增强” 

分 类 号：TG146.23[一般工业技术—材料科学与工程]