| Modulating mechanical performances of metallic amorphous materials through phase gradient | |
Guan, Yunlong; Wang YJ(王云江) ; Song, Weidong
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| Source Publication | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
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| 2022-11 | |
| Volume | 234Pages:107680 |
| ISSN | 0020-7403 |
| Abstract | Increasing strength is usually at the cost of sacrificing ductility in structural materials. The tradeoff becomes even conspicuous in a category of metallic amorphous materials, the so-called metallic glasses (MGs) featured without any atomic-scale translational symmetry. Therefore, there remains little room for simultaneous optimization of strength and ductility in MGs through tailoring the morphology and kinetics of structural imperfections. Here we propose an alternative strategy for modulating the mechanical properties of MGs through introducing proper content of compositional or phase gradient inspired by the mechanistic strain gradient theory. We design two types of CuZr-based phase gradient metallic glasses (PGMGs) with different compositional concentration gradient directions in either continuous or stepped gradient form. Extensive molecular dynamics simulations demonstrate that phase gradient raises the concentration of mechanically stable icosahedral and icosahedron-like Voronoi polyhedra and, thus, increases the strength of MGs. In terms of plastic deformation, free volume mismatch be-tween phases invalidates the autocatalytic activation mechanism of shear transformation zones, resulting in greater resistance to shear band propagation. The phase gradient also encourages branches of shear band and nucleation of multiple shear bands, which mechanism delocalizes deformation and postpones failure. These mechanisms lead to an improvement in the overall ductility of the PGMGs. The present strategy sheds light on evading the long-standing strength-ductility tradeoff in amorphous metals through extrinsic chemical and geometrical modulation that can be handled by appropriate thermal processing and fabrication technique. |
| Keyword | Metallic glasses Strength-ductility synergy Phase gradient Shear bands Molecular dynamics |
| Subject Area | Engineering, Mechanical ; Mechanics |
| DOI | 10.1016/j.ijmecsci.2022.107680 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000860322500002 |
| Funding Organization | National Natural Science Foundation of China [12172056, 11972092, 12002049] ; Beijing Institute of Technology Research Fund Program for Young Scholars [XSQD-202102005] ; Key Laboratory of Computational Physics Grant [HX02021-24] ; project of State Key Laboratory of Explosion Science and Technology [QNKT22-10] |
| Classification | 一类 |
| Ranking | 2 |
| Contributor | Song, WD (corresponding author), Beijing Inst Technol, State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China. |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/90174 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 1.Beijing Inst Technol, State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China |
| Recommended Citation GB/T 7714 | Guan, Yunlong,Wang YJ,Song, Weidong. Modulating mechanical performances of metallic amorphous materials through phase gradient[J]. INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES,2022,234:107680. |
| APA | Guan, Yunlong,王云江,&Song, Weidong.(2022).Modulating mechanical performances of metallic amorphous materials through phase gradient.INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES,234,107680. |
| MLA | Guan, Yunlong,et al."Modulating mechanical performances of metallic amorphous materials through phase gradient".INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 234(2022):107680. |
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| Jp2022FA082.pdf（13550KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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