文献类型：期刊文献

英文题名：Tuning generalized planar fault energies to enable deformation twinning in nanocrystalline aluminum alloys

作者：Zhang, Jingfan[1];Pang, Xueyong[1];Li, Yue[2];Wei, Shaolou[2];Yang, Chao[3];Pan, Shuaihang[4];Sun, Binhan[5];Zhou, Dengshan[1];Huang, Xiaoxu[6];Zhang, Deliang[1,7];Qin, Gaowu[1]

机构：[1]Northeastern Univ, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat, MoE, Shenyang 110819, Peoples R China;[2]Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany;[3]Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Adv High Temp Mat & Precis Formin, Shanghai 200240, Peoples R China;[4]Univ Utah, Dept Mech Engn, Lab Adv Mfg LoAM, Salt Lake City, UT 84107 USA;[5]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[6]Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China;[7]Northeastern Univ, Natl Frontiers Sci Ctr Ind Intelligence & Syst Opt, Shenyang 110819, Peoples R China

年份：2024

卷号：178

外文期刊名：INTERNATIONAL JOURNAL OF PLASTICITY

收录：;EI(收录号：20242316197169);WOS:【SCI-EXPANDED(收录号:WOS:001251610400001)】；

基金：Dengshan Zhou acknowledges the financial support from the Natural Science Foundation of China (Grant No. 51701036) , the Fundamental Research Funds for the Central Universities (Grant No. N2302013) , and the Natural Science Foundation of Liaoning (Grant No. 2023-MSBA-036) . Yue Li acknowledges the research fellowship provided by the Alexander von Humboldt Foundation. Chao Yang acknowledges the funding from the Science and Technology Cooperation Project of Inner Mongolia Autonomous Region and Shanghai Jiao Tong University (Grant No. 2023XYJG0001-01-01) . Shaolou Wei thanks the finantial support from Alexander von Humboldt Research Fellowship. We acknowledge Andreas Sturm for his assistance with the Focused Ion Beam/Scanning Electron Microscopy (FIB/SEM) facilities and Uwe Tezins for his assistance with the Atom Probe Tomography (APT) facilities. Special thanks are due to the instrumental/data analysis from Analytical and Testing Center, Northeastern University.

语种：英文

外文关键词：Nanocrystalline aluminum; Deformation twinning; Generalized stacking fault energies; Grain rotation; Plastic deformation mechanisms; First-principles calculations

摘要：As deformation twins have a profound impact on the plastic flow and mechanical properties of metallic materials, enhancing deformation twinning in face-centered cubic (FCC) metallic materials has long served as a unique microstructure design strategy to attain an extraordinary strength-ductility synergy. Deformation twinning, however, rarely occurs in pure FCC Al and its alloys since its generalized planar fault energies (GPFEs) are almost unaffected by most soluble alloying elements such as Mg, Zn and Cu. Here we successfully tune the GPFEs of a nanocrystalline Al-Mg alloy by alloying with Zr, Fe or Y element, and enable deformation twinning in the Zr-, Fe- and Y-containing alloys. Based on a combined analysis of microscopic observations, modeling and ab initio calculations, we find a strong grain-size-dependent twinning (i.e., twinning occurs in preferable grains having sizes in the range similar to 20-40 nm), as well as only one single twinning plane (i.e., twinning occurs in single, parallel atomic planes) for twin formation rather than intersecting twinning planes (i.e., twinning occurs in multiple, unparallel atomic planes) usually observed in coarse-grained FCC materials. This interesting twinning behavior is further observed to be accompanied by grain rotations, producing defective twin boundaries. Our experimental results extend the current understanding of the plastic deformation mechanisms in nanograined metallic materials, and will guide microstructure design of twinnable nanograined Al alloys with an improved strength-ductility synergy.