Tuning generalized planar fault energies to enable deformation twinning in nanocrystalline aluminum alloys

被引:4
|
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
关键词
Nanocrystalline aluminum; Deformation twinning; Generalized stacking fault energies; Grain rotation; Plastic deformation mechanisms; First-principles calculations; INITIO MOLECULAR-DYNAMICS; GRAIN-BOUNDARIES; FORMATION MECHANISM; DISLOCATION; AL; ONSET; TWINS; SLIP; SIZE;
D O I
10.1016/j.ijplas.2024.104018
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
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.
引用
收藏
页数:19
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