文献类型：期刊文献

英文题名：Dual-scale chemical ordering for cryogenic properties in CoNiV-based alloys

作者：Lu, Tiwen[1];Sun, Binhan[1];Li, Yue[2];Dai, Sheng[3];Yao, Ning[1];Li, Wenbo[3];Dong, Xizhen[2];Chen, Xiyu[1];Niu, Jiacheng[4];Ye, Fan[3];da Silva, Alisson Kwiatkowski[2];Zhu, Shuya[5];Xie, Yu[1];Yang, Xiaofeng[1];Deng, Sihao[6];Tan, Jianping[1];Li, Zhiming[5];Ponge, Dirk[2];He, Lunhua[6,7];Zhang, Xian-Cheng[1];Raabe, Dierk[2];Tu, Shan-Tung[1]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai, Peoples R China;[2]Max Planck Inst Sustainable Mat, Dusseldorf, Germany;[3]East China Univ Sci & Technol, Sch Chem & Mol Engn, Feringa Nobel Prize Scientist Joint Res Ctr, Key Lab Adv Mat & Joint Int Res Lab Precis Chem &, Shanghai, Peoples R China;[4]South China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Metall M, Guangzhou, Peoples R China;[5]Cent South Univ, Sch Mat Sci & Engn, Changsha, Peoples R China;[6]Spallat Neutron Source Sci Ctr, Dongguan, Peoples R China;[7]Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing, Peoples R China

年份：2025

卷号：645

期号：8080

起止页码：385

外文期刊名：NATURE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001594279000015)】；

基金：X.-C.Z. acknowledges the financial support from the National Key Research and Development Programme (2022YFB4602100) and the National Natural Science Foundation of China (52205152, 52321002, U21B2077), New Cornerstone Science Foundation. T.L. acknowledges the financial support from Shanghai Super Postdoctoral Incentive Plan (2021103) and Shanghai Pujiang Programme (23FJD023). B.S. acknowledges the financial support from the National Key Research and Development Project (2023YFB3712103), the National Natural Science Foundation of China (52275147) and the Shanghai Gaofeng Project for University Academic Program Development. S. Dai acknowledges the the National Natural Science Foundation of China (22376062), the Science and Technology Commission of Shanghai Municipality (24DX1400200 and 22ZR1415700) and the Fundamental Research Funds for the Central Universities. We thank J. Shi and T. He for discussions on the neutron diffraction analysis.

语种：英文

摘要：The mechanical properties of metallic materials often degrade under harsh cryogenic conditions, posing challenges for low-temperature infrastructures(1). Here we introduce a dual-scale atomic-ordering nanostructure, characterized by an exceptionally high number density of co-existing subnanoscale short-range ordering (approximately 2.4x10(26)m(-3)) and nanoscale long-range ordering (approximately 4.5x10(25)m(-3)) domains, within a metallic solid-solution matrix in a CoNiV-based alloy to improve the synergy of strength and ductility at low temperatures. We observe an ordering-induced increase in dislocation shear stress as well as a more rapid dislocation multiplication owing to the dislocation blocking effect of nanoscale long-range ordering and the associated generation of new dislocations. The latter effect also releases stress concentrations at nanoscale long-range-ordered obstacles that otherwise would promote damage initiation and failure. Consequently, the alloy shows a strength-elongation product of 76GPa% with a yield strength of approximately 1.2GPa at 87K, outperforming materials devoid of such ordering hierarchy, containing only short-range ordered or coherent precipitates of a few tens of nanometres. Our results highlight the impact of dual co-existing chemical ordering on the mechanical properties of complex alloys and offer guidelines to control these ordering states to enhance their mechanical performance for cryogenic applications.