Abstract When submicrocrystalline metal materials were first made available, their beneficial properties opened up various interesting design applications. However, several shortcomings soon became clear. One large problem is their complicated fabrication process, which cannot be applied on a large-scale industrial level. Another particularly vexing issue is their microstructural instability, which, even at lower temperatures, causes grains to rapidly coarsen. In this study, we have overcome these two problems in a submicrocrystalline Ti-Cu binary alloy. Contrary to conventional ideas of “microstructural heredity,” we have found that deformation with an initial coarse lamellar α′ microstructure when prism slip systems have been activated can remarkably refine grains to the submicron scale. We have also developed a strategy to improve the microstructural thermostability through Cu alloying, so that the submicrocrystalline grains formed during deformation at elevated temperatures can successfully be retained to room temperature. This study provides a theoretical foundation for the fabrication of submicrocrystalline titanium alloys using conventional hot rolling technology, which gives this alloy potential for further development within the titanium industry.

中文翻译：

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棱柱滑移相关动态再结晶在制备具有高热稳定性的亚微晶 Ti-Cu 合金中的作用

摘要 当亚微晶金属材料首次面世时，它们的有益特性开辟了各种有趣的设计应用。然而，几个缺点很快就变得清晰起来。一个大问题是它们的制造工艺复杂，无法在大规模工业水平上应用。另一个特别令人烦恼的问题是它们的微观结构不稳定性，即使在较低的温度下，也会导致晶粒迅速变粗。在这项研究中，我们在亚微晶 Ti-Cu 二元合金中克服了这两个问题。与“微观结构遗传”的传统观念相反，我们发现，当棱柱滑移系统被激活时，初始粗糙层状 α' 微观结构的变形可以显着地将晶粒细化到亚微米级。我们还开发了一种通过 Cu 合金化来提高微观结构热稳定性的策略，以便在高温变形过程中形成的亚微晶晶粒可以成功地保持到室温。该研究为使用常规热轧技术制造亚微晶钛合金提供了理论基础，这使该合金在钛工业中具有进一步发展的潜力。