Abstract The role of elemental partitioning between β and ω phase in embrittling an originally ductile ω-containing Ti–12Mo (wt.%) model alloy was studied using transmission electron microscopy and atom probe tomography. It is revealed that the embrittlement of this alloy already occurs after aging at 400 °C for as short as 10 min, when the size, inter-particle spacing and volume fraction of the ω particles remain almost unchanged. The origin of the aging-induced embrittlement is attributed to the significant rejection of Mo (>5 at.%) from the ω particles during aging, which leads to remarkable increase in the shear modulus (>30 GPa) of the ω particles, promoting intense plastic flow localization and facilitating crack nucleation prior to macroscopic yielding.

中文翻译：

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重新审视亚稳态 β 钛合金中的 ω 相脆化：元素分配的作用

摘要 使用透射电子显微镜和原子探针断层扫描研究了 β 和 ω 相之间的元素分配在使原本具有延展性的含 ω 的 Ti-12Mo (wt.%) 模型合金脆化中的作用。结果表明，这种合金在 400°C 时效短至 10 分钟后已经发生脆化，而 ω 颗粒的尺寸、颗粒间距和体积分数几乎保持不变。时效引起脆化的起因是在时效过程中从 ω 粒子中显着拒绝了 Mo (> 5 at.%)，这导致 ω 粒子的剪切模量 (>30 GPa) 显着增加，促进了在宏观屈服之前，强烈的塑性流动定位和促进裂纹成核。