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Cryoforged nanotwinned titanium with ultrahigh strength and ductility
Science ( IF 44.7 ) Pub Date : 2021-09-17 , DOI: 10.1126/science.abe7252
Shiteng Zhao 1, 2, 3 , Ruopeng Zhang 1, 2 , Qin Yu 4 , Jon Ell 1, 4 , Robert O Ritchie 1, 4 , Andrew M Minor 1, 2
Affiliation  

Nanostructured metals are usually strong because the ultrahigh density of internal boundaries restricts the mean free path of dislocations. Usually, they are also more brittle because of their diminished work-hardening ability. Nanotwinned materials, with coherent interfaces of mirror symmetry, can overcome this inherent trade-off. We show a bulk nanostructuring method that produces a multiscale, hierarchical twin architecture in a hexagonal closed-packed, solute-free, and coarse-grained titanium (Ti), with a substantial enhancement of tensile strength and ductility. Pure Ti achieved an ultimate tensile strength of almost 2 gigapascals and a true failure strain close to 100% at 77 kelvin. The multiscale twin structures are thermally stable up to 873 kelvin, which is above the critical temperature for many applications in extreme environments. Our results demonstrate a practical route to achieve attractive mechanical properties in Ti without involving exotic and often expensive alloying elements.

中文翻译:

具有超高强度和延展性的低温锻造纳米孪晶钛

纳米结构金属通常很坚固,因为超高密度的内部边界限制了位错的平均自由程。通常,由于加工硬化能力降低,它们也更脆。具有镜像对称相干界面的纳米孪晶材料可以克服这种固有的折衷。我们展示了一种块状纳米结构方法,该方法在六方密堆积、无溶质和粗晶钛 (Ti) 中产生多尺度、分层的孪生结构,并显着提高了拉伸强度和延展性。纯钛在 77 开尔文下实现了近 2 吉帕斯卡的极限抗拉强度和接近 100% 的真实失效应变。多尺度孪晶结构的热稳定性高达 873 开尔文,高于极端环境中许多应用的临界温度。
更新日期:2021-09-17
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