Modulating mechanical performances of metallic amorphous materials through phase gradient

doi:10.1016/j.ijmecsci.2022.107680

IMECH-IR > 非线性力学国家重点实验室

	Modulating mechanical performances of metallic amorphous materials through phase gradient
	Guan, Yunlong ; Wang YJ(王云江); Song, Weidong
发表期刊	INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
	2022-11
卷号	234 页码:107680
ISSN	0020-7403
摘要	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.
关键词	Metallic glasses Strength-ductility synergy Phase gradient Shear bands Molecular dynamics
学科领域	Engineering, Mechanical ; Mechanics
DOI	10.1016/j.ijmecsci.2022.107680
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000860322500002
项目资助者	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]
论文分区	一类
力学所作者排名	2
RpAuthor	Song, WD (corresponding author), Beijing Inst Technol, State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China.
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/90174
专题	非线性力学国家重点实验室
作者单位	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
推荐引用方式 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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