Effect of prior processing on the decomposition of the ß phase in Ti-Nb alloys during intermediate heat treatments
Effect of prior processing on the decomposition of the ß phase in Ti-Nb alloys during intermediate heat treatments
复制标题
中间热处理过程中预加工对Ti-Nb合金中α相分解的影响
DOI：
10.1016/j.scriptamat.2023.115729
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发表时间：
2024
影响因子：
6
通讯作者：
Talbot C
中科院分区：
文献类型：
--
作者：
Talbot C
亚稳β-Ti合金在等温时效过程中表现出多种分解途径。在低于α/β转变的中间温度下的年龄导致α或等温ω的形成。先前处理对这些途径的影响在文献中仍然很大程度上未被探索。因此，在冷轧和固溶条件下研究了加工对Ti-Nb合金的作用。溶解的样品显示出再结晶的证据，具有来自先前冷轧的剪切带残余物，其表现出比周围材料更大程度的织构。在等温时效过程中，在这些带外观察到ω iso，而α相在带内和整个冷轧样品中析出。这表明轧制过程中产生的残余应变对α/β界面的调节作用使α形核超过了ω iso形核。此外，还发现内部应变的大小对观察到的α形态有显著影响。
Metastable β-Ti alloys exhibit multiple decomposition pathways during isothermal ageing. Ages at intermediate temperatures below the α/βtransus result in the formation of α or isothermal ω. The effect of prior processing on these pathways remains largely unexplored within the literature. Therefore, the role of processing on a Ti–Nb alloy was investigated in cold rolled and solutioned conditions. The solutioned sample showed evidence of recrystallisation, with shear bands remnant from the prior cold rolling that exhibited a greater degree of texture than the surrounding material. During isothermal ageing ωisowas observed outside of these bands whilst α phase precipitated within the bands and throughout the cold rolled sample. This shows that the remnant strain from the rolling process facilitated α nucleation over ωisodue to accommodation of the α/β interface. Additionally, it was seen that the magnitude of internal strains had a marked effect on the α morphology observed.