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Journal of Iron and Steel Research(International) 2020年第1期27卷 96-104页

作者： Hui-wen Zhu Bao-yi Yu Hao Zhang Bo-ning Yu Shu-ning Lv Li Zheng Run-xia Li School of Material Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808GuangdongChina

Al/Ni multilayer composites are produced by Accumulative roll bonding process and then annealed with different temperatures and time.Macroscopic images,microstructure and mechanical properties of Al/Ni multilayer composites are investigated.As for the macroscopic images,although there was an edge crack along the rolling direction at the third pass,the defect of composites was not serious and the forming quality of composites was relatively good.The yield strength and elongation of Al/Ni multilayer composites are improved after the annealing treatment;however,with the increase in annealing temperature and time,the yield strength and ciongation of Al/Ni multilayer composites are decreased.During the process of annealing treatment,aluminum atoms diffuse in the way of vacancy diffusion,which results in the formation of Al3Ni intermetallic phase at Al/Ni interface and Kirkendall void in the aluminum side.The content of Al3Ni intermetallic phase and Kirkenckill void would increase with the increase in annealing temperature and time.

关键词： Al/Ni multilayer composite Accumulative roll bonding process Annealing treatment Interrnetallic phase

Microstructural and textural evolutions in multilayered Ti/Cu composites processed by Accumulative roll bonding

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Journal of Materials Science & Technology 2019年第6期35卷 1165-1174页

作者： Shuang Jiang Ru Lin Peng Nan Jia Xiang Zhao Liang Zuo Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) School of Material Science and Engineering Northeastern UniversityShenyang 110819 China Department of Mechanical Engineering Linkoping University Linkoping 58183 Sweden

Ti/Cu multilayered composites were fabricated via Accumulative roll bonding(ARB). During codeformation of the constituent metals, the hard Ti layers necked preferentially and then fragmented with the development of shear bands. Transmission electron microscopy showed that with increasing ARB cycles, grains in Ti were significantly refined even though dynamic recrystallization has occurred. For Cu the significant grain refinement was only found within the shear banded region when the composite was processed after five ARB cycles. Due to the diffusion of Cu atoms into Ti at the heterophase interfaces, amorphization with a width less than 10 nm was identified even in the composite processed by one cycle. At higher ARB cycles, the width of amorphous region increased and intermetallic compounds CuTi appeared from the region. The lattice defects introduced at the heterophase interfaces under roll bonding was responsible for the formation of the nano-scaled compounds. X-ray diffraction showed that an abnormal {1120} fiber texture was developed in Ti layers, while significant brass-type textures were developed in Cu layers. Some orientations along the {1120} fiber favored the prismatic slip for Ti.Tensile tests revealed the elevated strength without a substantial sacrifice of ductility in the composites during ARB. The unique mechanical properties were attributed to the significantly refined grains in individual metals, the good bonding between the constituent metals, as well as the development of an abnormal {1120} fiber texture in Ti layers.

关键词： Titanium/copper multilayered composite Accumulative roll bonding Microstructure Texture Mechanical properties

Enhanced Electromagnetic Interference Shielding in a Duplex-Phase Mg-9Li-3Al-1Zn Alloy Processed by Accumulative Roll Bonding

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Acta Metallurgica Sinica(English Letters) 2020年第4期33卷 490-499页

作者： Jiahao Wang Lin Xu Ruizhi Wu Jing Feng Jinghuai Zhang Legan Hou Milin Zhang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China College of Science Heihe UniversityHeihe 164300China

High electromagnetic shielding performance was achieved in the Mg-9Li-3Al-1Zn alloy processed by Accumulative roll bonding(ARB).The microstructure,electromagnetic interference shielding effectiveness(SE) in the frequency of 30-1500 MHz and mechanical properties of the alloy were investigated.A model based on the shielding of the electromagnetic plane wave was used to theoretically discuss the EMI shielding mechanisms of ARB-processed alloy.Results indicate that the SE of the material increases gradually with the increase in the ARB pass.The enhanced SE can be attributed to the obvious microstructure orientation caused by ARB,and the alternative arrangement of alpha(Mg) phase and beta(Li)phase.In addition,with the increase in ARB pass,the number of interfaces between layers increases and the grain orientation of each layer tends to alignment along c-axis,which is beneficial to the reflection loss and multiple reflection loss of the incident electromagnetic wave.

关键词： Accumulative roll bonding(ARB) Mg-Li alloy Dual-phase alloys Electromagnetic interference Reflection loss

Microstructure and mechanical properties of SiC-particle-strengthening tri-metal Al/Cu/Ni composite produced by Accumulative roll bonding process

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International Journal of Minerals,Metallurgy and Materials 2018年第3期25卷 357-364页

作者： Moslem Tayyebi Beitallah Eghbali Department of Material Engineering Sahand University of Technology

In this study, a multilayer Al/Ni/Cu composite reinforced with Si C particles was produced using an Accumulative roll bonding(ARB) process with different cycles. The microstructure and mechanical properties of this composite were investigated using optical and scanning microscopy and hardness and tensile testing. The results show that by increasing the applied strain, the Al/Ni/Cu multilayer composite converted from layer features to near a particle-strengthening characteristic. After the fifth ARB cycle, a composite with a uniform distribution of reinforcements(Cu, Ni, and SiC) was fabricated. The tensile strength of the composite increased from the initial sandwich structure to the first ARB cycle and then decreased from the first to the third ARB cycle. Upon reaching five ARB cycles, the tensile strength of the composite increased again. The variation in the elongation of the composite exhibited a tendency similar to that of its tensile strength. It is observed that with increasing strain, the microhardness values of the Al, Cu, and Ni layers increased, and that the dominant fracture mechanisms of Al and Cu were dimple formation and ductile fracture. In contrast, brittle fracture in specific plains was the main characteristic of Ni fractures.

关键词： Accumulative roll bonding Al/Ni/Cu/SiC composite silicon carbide particles microstructure mechanical properties

Investigating of the Microstructure and Mechanical Properties of Al-Based Composite Reinforced with Nano-Trioxide Tungsten via Accumulative Roll Bonding Process

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Open Journal of Metal 2017年第1期7卷 9-23页

作者： Jalal Kahani Khabushan Soheila Bazzaz Bonabi R&D Department Oghab Afshan Industrial & Manufacturing Company Semnan Iran Faculty of Materials and Metallurgical Engineering Semnan University Semnan Iran

In the present investigation, an Al/WO3p metal matrix nanocomposite was fabricated by Accumulative roll bonding (ARB) technique. Microstructural evaluation and mechanical properties of specimens were studied by Field Emission-Scanning Electron Microscopy, X-ray Diffraction, microhardness and tensile test. Several factors that affect uniform distribution of reinforcing particles were investigated. At the initial stages of ARB process particle free zones as well as particle clusters were observed in the microstructure of the composite. After 12 ARB cycles, a nanocomposite with a uniform distribution of nanoparticles was produced. It was shown that the tensile strength of the ARBed composite enhanced with the increasing number of ARB cycles. After the first cycle, a significant increase was observed in the tensile strength of nanocomposite in 2.0 percent volume of WO3p, from 89 MPa to 128 MPa (almost 1.4 times increase in strength). After the final cycle, the tensile strength value increased to 205 MPa (that is almost 2.3 times increase in strength) due to the strain hardening and grain refinement. The X-ray diffraction results showed that Al/WO3p nanocomposite with the average crystallite size of 41 nm was successfully attained after 12 cycles of the ARB process. Finally, observations revealed that the fracture mode in Al/WO3p nanocomposite was of type shearing ductile fracture with elongated shallow dimples.

关键词： Accumulative Roll Bonding Nanocomposite Microstructure Mechanical Properties

Novel models for simulating maize growth based on thermal time and photothermal units: Applications under various mulching practices

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Journal of Integrative Agriculture 2023年第5期22卷 1381-1395页

作者： LIAO Zhen-qi ZHENG Jing FAN Jun-liang PEI Sheng-zhao DAI Yu-long ZHANG Fu-cang LI Zhi-jun Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas Ministry of EducationNorthwest A&F UniversityYangling 712100P.R.China Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041P.R.China

Maize (Zea mays L.) is one of the three major food crops and an important source of carbohydrates for maintaining food security around the world.Plant height (H),stem diameter (SD),leaf area index (LAI) and dry matter (DM) are important growth parameters that influence maize production.However,the combined effect of temperature and light on maize growth is rarely considered in crop growth models.Ten maize growth models based on the modified logistic growth equation (Mlog) and the Mitscherlich growth equation (Mit) were proposed to simulate the H,SD,LAI and DM of maize under different mulching practices based on experimental data from 2015–2018.Either the Accumulative growing degree-days (AGDD),helio thermal units (HTU),photothermal units (PTU) or photoperiod thermal units (PPTU,first proposed here) was used as a single driving factor in the models;or AGDD was combined with either Accumulative actual solar hours (ASS),Accumulative photoperiod response (APR,first proposed here) or Accumulative maximum possible sunshine hours (ADL) as the dual driving factors in the models.The model performances were evaluated using seven statistical indicators and a global performance index.The results showed that the three mulching practices significantly increased the maize growth rates and the maximum values of the growth curves compared with non-mulching.Among the four single factor-driven models,the overall performance of the Mlog_(PTU)Model was the best,followed by the Mlog_(AGDD)Model.The Mlog_(PPTU)Model was better than the Mlog_(AGDD)Model in simulating SD and LAI.Among the 10 models,the overall performance of the Mlog_(AGDD–APR)Model was the best,followed by the Mlog_(AGDD–ASS)Model.Specifically,the Mlog_(AGDD–APR)Model performed the best in simulating H and LAI,while the Mlog_(AGDD–ADL)and Mlog_(AGDD–ASS)models performed the best in simulating SD and DM,respectively.In conclusion,the modified logistic growth equations with AGDD and either APR,ASS or ADL as the dual driving factors outperformed the commonly used modified

关键词： thermal time Accumulative growing degree-days helio thermal units photothermal units growth model

CHEMICAL HARDNESS, REACTIVITY AND PROPERTY OF MATTER——Accumulative PROPERTY OF THE COMPLEXES OF ACIDS AND BASES

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Chinese Science Bulletin 1992年第13期37卷 1080-1083页

作者：王远亮 Department of Applied Chemistry Chongqing University Chongqing 630044 PRC

Theoretical research on hard and soft acids and bases (HSAB) has been getting to the bottom recently, and solidly theoretical sets have been developed by summarizing and classifying the measured values. In practice, it has been developed to quantitatively expounding numbers of questions from qualitatively interpreting many chemical phenomena.

关键词： hard and soft acids and bases complex Accumulative point Accumulative equation.

Characterization of low-N responses in maize(Zea mays L.) cultivars with contrasting nitrogen use efficiency in the North China Plain

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Journal of Integrative Agriculture 2019年第9期18卷 2141-2152页

作者： LI Xiang-ling GUO Li-guo ZHOU Bao-yuan TANG Xiang-ming CHEN Cong-cong ZHANG Lei ZHANG Shao-yun LI Chong-feng XIAO Kai DONG Wei-xin YIN Bao-zhong ZHANG Yue-chen College of Agronomy Hebei Agricultural University/Key Laboratory of Crop Growth Regulation of Hebei ProvinceBaoding 071001P.R.China Institute of Crop Sciences Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Physiology and ProductionMinistry of Agriculture and Rural AffairsBeijing 100081P.R.China College of Plant Protection Hebei Agricultural UniversityBaoding 071001P.R.China Teaching Support and Service Center Hebei Radio and TV UniversityShijiazhuang 050080P.R.China

Over-use of N fertilizer in crop production has resulted in a series of environmental problems in the North China Plain(NCP).Thus,improvement of nitrogen use efficiency(NUE)in summer maize has become an effective strategy for promoting sustainable agriculture in this region.Using twenty maize cultivars,plant dry matter production,N absorption and accumulation,yield formation,and NUE in summer maize were investigated under three N levels in two growing seasons.Based on their yield and yield components,these maize cultivars were categorized into four groups including efficient-efficient(EE)cultivars,high-nitrogen efficient(HNE)cultivars,low-nitrogen efficient(LNE)cultivars and nonefficient-nonefficient(NN)cultivars.In both two seasons,the EE cultivars improved grain yield together with increased plant biomass,and enhanced Accumulative amounts as well as higher average grain yields than the other cultivar groups under deficient-N conditions.Significant correlations were observed between yield and kernel numbers(KN),dry matter(DM)amount and N accumulation at both post-silking and maturity stages.DM and N accumulation at late growth stage(i.e.,from silking to maturity)contributed largely to the enhanced yield capacity and improved NUE under N-deficient conditions.Compared with the NN cultivars,the EE cultivars also showed increased N assimilation amount(NAA)and N remobilization content(NRC),and elevated N remobilization efficiency(NRE),NUE and nitrogen partial factor productivity(PFPN).Our investigation has revealed N-associated physiological processes and may provide guidance for cultivation and breeding of high yield and NUE summer maize under limited N conditions in the NCP.

关键词： summer maize N deficiency yield dry matter production N Accumulative amount

THE IMPROVEMENT OF ALKALINE MEADOW BY Accumulative SAND BY WIND IN THE SONGNEN PLAIN

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Chinese Geographical Science 1993年第2期3卷 65-68页

作者：李崇皓郑萱凤

In the Songnen Plain, there are 330,000 ha of alkaline meadow, many sand sources such as fixed dunes, semi-fixed dunes and sand hills, and rich wind force resources as well. Sand has been stopped naturally and A neurolepidium chinense has grown on alkaline patch of the plain. If we make use of the natural law and set up manmade obstacles in alkaline patches, we can use Accumulative sand to cover alkali, improve alkaline meadow, restore A neurolepidium chinense vegetation to develop animal husbandry.

关键词： alkaline meadow Accumulative sand improvement of alkaline meadow

Microstructure and mechanical properties of Al/Cu/Mg laminated composite sheets produced by the ARB proces

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International Journal of Minerals,Metallurgy and Materials 2018年第5期25卷 564-572页

作者： Davood Rahmatabadi Moslem Tayyebi Ramin Hashemi Ghader Faraji School of Mechanical Engineering Iran University of Science and Technology Department of Materials Engineering Sahand University of Technology School of Mechanical Engineering College of EngineeringUniversity of Tehran

In the present study, an Al/Cu/Mg multi-layered composite was produced by Accumulative roll bonding(ARB) through seven passes, and its microstructure and mechanical properties were evaluated. The microstructure investigations show that plastic instability occurred in both the copper and magnesium reinforcements in the primary sandwich. In addition, a composite with a perfectly uniform distribution of copper and magnesium reinforcing layers was produced during the last pass. By increasing the number of ARB cycles, the microhardness of the layers including aluminum, copper, and magnesium was significantly increased. The ultimate tensile strength of the sandwich was enhanced continually and reached a maximum value of 355.5 MPa. This strength value was about 3.2, 2, and 2.1 times higher than the initial strength values for the aluminum, copper, and magnesium sheets, respectively. Investigation of tensile fracture surfaces during the ARB process indicated that the fracture mechanism changed to shear ductile at the seventh pass.

关键词： multi-layered composite Al/Cu/Mg Accumulative roll bonding fractography mechanical properties microstructure