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Pressure-induced structural crossover in a Zr65Ni35 metallic glass

Physical Review B 2024年第17期109卷 174111-174111页

作者： Dazhe Xu Hongbo Lou Di Peng Zhenfang Xing Fujun Lan Ziliang Yin Fei Zhang Lianghua Xiong Zhidan Zeng Hongwei Sheng Qiaoshi Zeng Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments (MFree) Institute for Shanghai Advanced Research in Physical Sciences (SHARPS) Shanghai 201203 China State Key Laboratory of Superhard Materials Institute of Physics Jilin University Changchun 130012 China Multi-Discipline Research Center Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Physics and Astronomy George Mason University Fairfax Virginia 22030 USA

The local atomic structure has long been recognized as a predominant characteristic and key to understanding glassy structures and properties. However, the factors governing the formation and evolution of these structures in metallic glasses remain elusive. Herein, we report an unexpected local structural crossover under pressure in a simple binary Zr65Ni35 metallic glass consisting of pure transition metals, evidenced by in situ high-pressure synchrotron x-ray diffraction and electrical resistivity measurements combined with ab initio molecular dynamics simulations. While the specific volume of the metallic glass (MG) follows a single-phase compression behavior without an apparent volume collapse, detailed analysis of the structural properties using structure factor, reduced pair-distribution function, and simulations reveals sharp changes of the Ni-centered clusters at ∼20 GPa in terms of their coordination numbers, atomic pair distances, and Voronoi polyhedra. This structural crossover is found to be closely linked to the enhanced contribution of the Ni d orbital to the electron density of state at the Fermi level under high pressures. These results underscore the correlation between the local atomic structure and the intricate electronic structure, particularly the 3d electronic structure, in transition-metal MGs, which sheds light on the stability characteristics of local structures in MGs from an electronic structure point of view.

关键词： Electronic structure High-pressure studies Structural phase transition Metallic glasses Ab initio molecular dynamics X-ray diffraction

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Multi-Scale GHG Emission Relations in Resource-Based Heavy Industrial Cities: A Case Study of Tangshan City, Hebei Province

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Chinese Journal of Urban and Environmental Studies 2021年第4期9卷 74-98页

作者： HAN Mengyao JIANG Chuan LIU Siyuan Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Key Laboratory of Regional Sustainable Development Modeling Chinese Academy of Sciences School of Mechanical Engineering Yanshan University Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science (Ministry of Education of China)Yanshan University

The greenhouse gas(GHG) emission pressure faced by resource-based heavy industrial cities was mainly induced by multi-scale interactions, which require systematical assessments from local,regional, national and global scales. Taking Tangshan city, a heavy industry base in Hebei Province of China, as the research area, this study carried out a multi-scale analysis on the GHG emissions in terms of final demand, final consumption and trade balance. The main results are as follows:(1) The average embodied intensity of GHG emissions in Tangshan was 27.6 tons/10,000 CNY, of which 66.2% was caused by local inputs;(2) The secondary industry was the main source for the relatively high GHG emissions in Tangshan;(3) The GHG emissions embodied in final demand were 201.6 million tons, within which the proportion of fixed capital formation reached 59.4%;(4) As for the trade balance, Tangshan was a net exporter of embodied GHG emissions, with the total net outflows of 411.6 million tons. Depicting the GHG emission flows and sorting out the multiple GHG emission inventory would be helpful to identify the transformation pressure of resource-based heavy industry cities, which would be significant for the adjustments in industrial structures and policy optimization of energy saving and emissions reduction.

关键词： Resource-based heavy industry city embodied greenhouse gas emissions multi-scale input–output analysis

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Experimental Study on the Low-Power Laser-Tig Hybrid Welding of Sicp/ 6061-T6 Al Matrix Composites

SSRN

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SSRN 2024年

作者： Gao, Zeng Zhang, Jianing Ba, Xianli Liu, Yang Huang, Mengxin Wang, Peng School of Materials Science and Engineering Henan Polytechnic University Jiaozuo454003 China Key Laboratory of Liaoning Advanced Welding and Joining Technology School of Materials Science and Engineering Dalian University of Technology Dalian116024 China Institute of Materials Science Joining and Forming Graz University of Technology Graz8010 Austria

This study investigates the use of low-power laser-induced tungsten inert gas (TIG) hybrid welding for joining SiC particle reinforced 6061-T6 aluminum matrix composites (SiCp/6061-T6 Al MMCs). The tensile strength, microhardness, microstructure, and fracture morphology of the joints were comprehensively analyzed in this research. The results demonstrate that laser power is a critical factor influencing the joint strength, with the highest observed strength reaching 182.67 MPa. Notably, the weld zone exhibited the lowest microhardness, while the heat-affected zone remained narrow and displayed a softened hardness profile. Microstructural analysis revealed pronounced interfacial reactions, marked by the formation of a significant amount of needle-shaped Al4C3, which adversely affected the joint strength, while only producing limited quantities of Al4SiC4. These interfacial reactions were predominantly observed in regions with concentrated SiC particles, while the depleted areas exhibit an equiaxed grain structure. Fracture analysis revealed that the joint predominantly exhibited characteristics of brittle fracture. © 2024, The Authors. All rights reserved.

关键词： Tensile strength

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Microstructure and Mechanicalproperties of a Low-Alloyed Mg-Zn-Al-Ca Alloy: Effect of Extrusion Speed

SSRN

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SSRN 2024年

作者： Liu, Ling Zhang, Datong Wang, Hua Qiu, Cheng Chen, Daolun Guangdong Key Laboratory for Advanced Metallic Materials Processing and Forming National Engineering Research Center of Near-net-shape Forming for Metallic Materials South China University of Technology Guangzhou510640 China Department of Mechanical Industrial and Mechatronics Engineering Toronto Metropolitan University TorontoONM5B 2K3 Canada

A low-alloyed Mg-1.2Zn-0.6Al-0.1Ca (wt.%) alloy was extruded at 200 °C with different ram speeds (0.5-4.0 mm/s), and the microstructure and mechanical properties were studied systematically. Heterostructures with fine dynamic recrystallized (DRXed) grains and coarse unDRXed grains were achieved at lower ram speeds of 0.5 mm/s and 1.0 mm/s, and fully-DRXed microstructure was attained at 4.0 mm/s. Increasing the extrusion speed resulted in an increase in DRXed grain size from 0.9 μm to 3.8 μm, and a transformation of the DRXed texture component from - to a new orientation that deviated by approximately 14°. The sample extruded at 0.5 mm/s presented an excellent tensile yield strength (TYS) of 369 MPa along with a 7.8% elongation, which was mainly owing to the high hetero-deformation induced (HDI) strengthening provided by its heterostructures. Increasing ram speed resulted in an improved elongation despite a decreased TYS. The reasons for the decreased strength with increasing extrusion speed were mainly associated with grain growth, reduced dislocation density and weakened HDI strengthening. The reasons for the improved ductility with increasing extrusion speed were largely due to the increased DRXed grains fraction with soft orientations. © 2024, The Authors. All rights reserved.

关键词： Magnesium alloys

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An Iterative Compensation Algorithm for Springback Control in Plane Deformation and Its Application

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Chinese Journal of Mechanical Engineering 2019年第2期32卷 212-223页

作者： Rui Ma Chunge Wang Ruixue Zhai Jun Zhao Key Laboratory of Advanced Forging & Stamping Technology and ScienceMinistry of Education of China Yanshan University College of Mechanical Engineering Yanshan University College of Mechanical and Energy Engineering Ningbo Institute of Technology Zhejiang University Key Laboratory of Roll Forming Technology Research

In order to solve the springback problem in sheet metal forming, the trial and error method is a widely used method in the factory, which is time-consuming and costly for its non-direction and non-quantitative. Finite element simulation is an e ective method to predict the springback of complex shape parts, but its precision is sensitive to the simulation model, particularly material model and boundary conditions. In this paper, the simple iterative method is introduced to establish the iterative compensation algorithm, and the convergence criterion of iterative parameters is put forward. In addition, the new algorithm is applied to the V-free bending and stretch-bending processes, and the convergence of curvature and bending angle is proved theoretically and verified experimentally. At the same time,the iterative compensation experiments for plane bending show that, the new method can predict the next compensaantido tnh ev atlaureg ebta cseurdv oatnu trhe ew sitphri tnhgeb earcrko ro fo fe laecshs ttehsat,n s0 o. 5 th%a ta rteh eo btatraigneet db aefntedri n2 g-3 a nitgelrea tiwoitnhs.t Thhei se rrreosre aorf clhe sps rtohpaons e±s 0 a.1%new iterative compensation algorithm to predict springback in sheet metal forming process, where each compensation value depends only on the iteration parameter di erence before and after springback for the same forming process of same material.

关键词： Springback control Iterative compensation algorithm Convergence criterion V-free bending Stretchbending

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Effect of temperature on the dispersion of graphene in graphene reinforced aluminum matrix composite 4

Effect of temperature on the dispersion of graphene in graph...

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2020 4th International Conference on Material Science and technology, ICMST 2020

作者： Wang, Qiang Sun, Qingze Chen, Shengyong Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao066004 China

The influence of hot pressing temperature on the dispersion of graphene (GR) in GR reinforced aluminum matrix composites was investigate. The micro structure s of the sample were observed by optical microscope, scanning electron microscopy and energy dispersion spectrum, respectively. The temperature is hold at 640-750°C, and the interval is 10°C. The results show that GR is mainly distributed at the grain boundary at 640°C. And GR is dispersed in the aluminum matrix, without obvious agglomeration at the temperature from 670°C to 680°C. However, GR is agglomerated in the aluminum matrix and has obvious regional differentiation at 690-750°C, in which the concentrated area of GR is in the middle of the sample, and the dilution area in the rest. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： Graphene

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Modeling and simulation of 3D topographies of slot milled walls and floor surface considering slot bi-sided wall constraints

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Journal of Manufacturing Processes 2025年 149卷 241-257页

作者： Lyu, Wenjun Liu, Zhanqiang Wang, Bing Cai, Yukui Liang, Xiaoliang Li, Liangliang School of Mechanical Engineering Shandong University Jinan250061 China State Key Laboratory for High-end Equipment and Advanced Technology of Metal Forming Shandong University Jinan250061 China Key Laboratory of High-efficiency and Clean Mechanical Manufacture of Ministry of Education Jinan250061 China Key National Demonstration Center for Experimental Mechanical Engineering Education Jinan250061 China School of Mechanical Electrical & Information Engineering Shandong University Weihai264209 China Shenyang Aircraft Corporation Shenyang110850 China

The deflection of long-cantilever length milling cutter significantly influences both surface morphology and dimensional precision during milling operations. Three surfaces are formed concurrently, including two walls and one floor surface in the one-pass slot milling operation. The cutting tool-edges concurrently make contacts with the floor surface and bi-sided walls of the slot. The bi-sided walls of the slot impose complex contact constraints on the cutting tool-edges, and the loaded force situation of the milling cutter is complex. The application of cantilever beam theory for calculating cutter deflection in planar milling is no longer applicable to one-pass slot milling. This study proposes a novel predictive framework for surface morphology in one-pass slot milling operations, incorporating time-dependent tool deflection. Firstly, the contact and force between cutting tool-edges and slot bi-sided walls and floor surface were analyzed. Secondly, the milling tool deflection models were proposed accounting for varying contact conditions of the cutting tool-edges with the slot bi-sided walls. The universal methodology for calculating tool deflection, applicable to various milling tool deflection models, has been developed. Then, the time-dependent milling force during one-pass slot milling was derived by considering time-dependent tool deflection. Numerical calculations were performed on the instantaneous cutter deflection. Finally, the bi-sided walls and floor surface topographies of slot milling were simulated and reconstructed by accounting for milling parameters, tool installation errors, random wear errors of milling tool, time-dependent milling forces and tool deflection. This framework can be embedded as a functional module in smart machining centers, enabling prediction and control of surface characteristics and dimensional accuracy. © 2025 The Society of Manufacturing Engineers

关键词： Milling machines

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Research of the Influence Mechanism of Multi Gradient Printing on Sand Mold Performance 7

Research of the Influence Mechanism of Multi Gradient Printi...

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2021 7th International Forum on Manufacturing technology and Engineering Materials, IFEMMT 2021

作者： Zheng, L.I. Zhongde, Shan Feng, Liu Yuelong, Ran State Key Laboratory of Advanced Forming Technology and Equipment Beijing National Innovation Institute of Lightweight Ltd. Beijing100044 China Nanjing University of Aeronautics and Astronautics Nan jing211106 China

In this paper, multi gradient sand mold sample printing was carried out based on the gray printing technology of sand mold 3D printing, and the influence of gradient distribution of resin addition in sand mold on the property of sand mold was studied. The results showed that the increase of resin addition gradient in sand mold would result in the decrease of tensile strength of sand mold with the constant total resin addition. The bending strength and air permeability of sand mold were mainly affected by the surface resin addition and gradient distribution. With increase of surface resin addition, The bending strength of sand mold decreased, and of which the air permeability increased at the same time. And the increase of gradient spacing between adjacent resin addition gradients in sand mold would lead to the increase of sand mold air permeability and the decrease of tensile strength and bending strength. The result also showed that The surface hardness of the sand mold increased with the increase of the resin content of the surface layer, and had nothing to do with the gradient distribution of the resin content. © Published under licence by IOP Publishing Ltd.

关键词： Resins

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Erratum to:Finite element simulation and experimental test of the wear behavior for self-lubricating spherical plain bearings

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Friction 2024年第7期12卷 1620-1620页

作者： Yahong XUE Jigang CHEN Sumin GUO Qingliang MENG Junting LUO School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing Yanshan UniversityQinhuangdao 066004China Education Ministry Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan UniversityQinhuangdao 066004China

Erratum to Friction 10(6):803–841(2022)Yahong Xue,Jigang Chen,Sumin Guo,Qingliang Meng&Junting *** element simulation and experimental test of the wear behavior for self-lubricating spherical plain *** 6(3):297–306(2018).https://***/10.1007/s40544-018-0206-x The authors regret that there was an inadvertent error in Fig.10(c)after checking the *** is important to note that the change does not impact the main conclusion of the *** 10(c)on page 304 was selected as the incorrect picture,and the accurate version of Fig.10(c)is provided as below.

关键词： wear Friction bearings

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Unraveling the link between annealing system and microstructure-mechanical properties of Mg/Al clad plate with corrugated interface

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Surfaces and Interfaces 2025年 69卷

作者： Li, Sha Li, Guoyan Wang, Heng Gui, Hailian Chu, Zhibing Han, Jianchao Wang, Tao School of Materials Science and Engineering Taiyuan University of Science and Technology Taiyuan 030024 China National Key Laboratory of Advanced Stainless Steel Taiyuan 030024 China College of Mechanical Engineering Taiyuan University of Technology Taiyuan 030024 China Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment Ministry of Education Taiyuan 030024 China

In this study, the effects of annealing treatment on the microstructure evolution and mechanical properties of the CFR Mg/Al clad plates were investigated, focusing on the temperature range of 200∼350 °C. The annealing process was conducted on the CFR Mg/Al clad plate and subsequently performed Electron Backscatter Diffraction (EBSD) analysis on the Mg/Al interface, along with tensile, tensile-shear, and hardness tests to thoroughly examine the changes in microstructure and mechanical properties. The findings revealed that at 200 °C/30 min, a slender Mg₁₇Al₁₂ phase emerged at the new bonding interface, enhancing the interface metallurgical bonding and overall bonding strength. At 250 °C/30 min, the new bonding interface rapidly expanded, leading to the formation of a complex intermetallic compounds (IMCs) layer containing both Mg₁₇Al₁₂ and Mg₂Al₃ phases. As the annealing temperature increased to 300 °C, a uniform distribution of the IMCs layer was observed across the entire interface, with the thickness of this layer increasing with higher annealing temperatures. Concurrently, the ultimate tensile strength (UTS) and interfacial tensile-shear strength decreased with rising annealing temperatures. Specifically, the transverse UTS at peak and trough positions were measured as 260.89 MPa and 264.47 MPa, respectively. The tensile-shear strength at the peak interface annealed at 200 °C/30 min was 30.15 MPa, while at the trough position, it was 35.09 MPa. © 2025

关键词： Annealing treatment Bonding strength CFR, Mg/Al clad plate Microstructure

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