Freezing solute atoms in nanograined aluminum alloys via high-density vacancies.
Freezing solute atoms in nanograined aluminum alloys via high-density vacancies.
复制标题
通过高密度空位冻结纳米晶铝合金中的溶质原子。
DOI：
10.1038/s41467-022-31222-6
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发表时间：
2022-06-17
影响因子：
16.6
通讯作者：
中科院分区：
文献类型：
--
作者：
过饱和固溶体在低温下分解为沿晶析出物是限制纳米晶铝合金实际应用的瓶颈。减小空位浓度通常被认为是抑制分解过程的有效途径。在这里，我们报告了一个违反直觉的战略，以稳定过饱和固溶体的纳米晶Al-Cu合金通过高密度空位结合Sc微合金化。通过在强（Cu，Sc，空位）富集的原子络合物中产生两个数量级更高浓度的空位，在Al-Cu-Sc合金中实现了高的热稳定性，其沉淀在高达~230 °C下几乎被抑制。溶质-空位复合体也使纳米晶Al-Cu合金具有更高的强度、更大的应变硬化能力和塑性。这些研究结果提供了展望的巨大潜力的溶质-空位相互作用和发展的纳米晶粒合金具有高稳定性和良好的机械性能。低温分解和塑性变形能力不足是限制纳米晶铝合金实际应用的瓶颈。在这里，作者利用高密度空位结合Sc微合金化来稳定纳米晶Al-Cu合金。
Low-temperature decomposition of supersaturated solid solution into unfavorable intergranular precipitates is a long-standing bottleneck limiting the practical applications of nanograined aluminum alloys that are prepared by severe plastic deformation. Minimizing the vacancy concentration is generally regarded as an effective approach in suppressing the decomposition process. Here we report a counterintuitive strategy to stabilize supersaturated solid solution in nanograined Al-Cu alloys via high-density vacancies in combination with Sc microalloying. By generating a two orders of magnitude higher concentration of vacancies bonded in strong (Cu, Sc, vacancy)-rich atomic complexes, a high thermal stability is achieved in an Al-Cu-Sc alloy that precipitation is nearly suppressed up to ~230 °C. The solute-vacancy complexes also enable the nanograined Al-Cu alloys with higher strength, greater strain hardening capability and ductility. These findings provide perspectives towards the great potentials of solute-vacancy interaction and the development of nanograined alloys with high stability and well-performed mechanical properties. Low-temperature decomposition and insufficient plastic deformability are bottlenecks that limit the practical applications of nanograined Al alloys. Here the authors utilize a high density vacancies in combination with Sc microalloying to stabilize nanograined Al-Cu alloys.
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DOI：
10.1016/j.jmrt.2017.05.001
发表时间：
2017-10-01
影响因子：
6.4
作者：
El-Tahawy, Moustafa;Huang, Yi;Gubicza, Jeno
通讯作者：
Gubicza, Jeno
影响因子：
1.2
作者：
Cizek, J.;Janecek, M.;Dobatkin, S. V.
通讯作者：
Dobatkin, S. V.
影响因子：
3.7
作者：
Kresse, G;Furthmuller, J
通讯作者：
Furthmuller, J
影响因子：
64.8
作者：
Biswas, Kanishka;He, Jiaqing;Kanatzidis, Mercouri G.
通讯作者：
Kanatzidis, Mercouri G.
影响因子：
16.6
作者：
Dumitraschkewitz, Phillip;Uggowitzer, Peter J.;Pogatscher, Stefan
通讯作者：
Pogatscher, Stefan