Development of ultra-high strength Ti-Nb-Sn alloys through grain-refinement by in situ Zener pinning
Development of ultra-high strength Ti-Nb-Sn alloys through grain-refinement by in situ Zener pinning
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DOI：
10.1016/j.scriptamat.2022.114809
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发表时间：
2022
影响因子：
6
通讯作者：
N.L. Church;C. Talbot;G.J. Wise;Oyi Shah;N. Jones
中科院分区：
文献类型：
--
作者：
N.L. Church;C. Talbot;G.J. Wise;Oyi Shah;N. Jones
基于Ti-Nb系统的亚稳β-Ti合金具有商业利益，因为它们经历提供阻尼能力的可逆马氏体转变。然而，与其他替代品（如NiTi）相比，它们的使用目前受到低屈服应力的限制。在这里，我们将展示如何克服这种限制，通过thein situformation的Ti 3Sn相的同时recrystalisation。由Ti 3Sn沉淀物产生的齐纳钉扎提供了显著的Hall-Petch强化，导致屈服应力超过1GPa，是类似合金的两倍以上，同时仍然允许常规的加工路线。这有可能提供可以与NiTi相媲美的Ti-Nb屈服应力，解决这类合金的最大挑战之一。
Metastable β-Ti alloys based on the Ti-Nb system are of commercial interest as they undergo a reversible martensitic transformation that offers damping capabilities. However, their use is currently limited by a low yield stress compared to other alternatives such as NiTi. Here, we show how this limitation can be overcome by thein situformation of the Ti3Sn phase concurrent with recrystalisation. The Zener pinning resulting from the Ti3Sn precipitates provides significant Hall-Petch strengthening leading to a yield stress in excess of 1 GPa, more than double that of similar alloys, whilst still allowing conventional processing routes. This has the potential to provide Ti-Nb yield stresses that can rival those of NiTi, addressing one of the biggest challenges for this class of alloys.