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Effect of Room Temperature Ultrasonic Vibration Compression on the Microstructure Evolution and Mechanical Properties of AZ91 Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1135-1146页

作者： Ziyue Xu Huan liu luyao li Chao Sun Xi Tan Baishan Chen Qiangsheng Dong Yuna Wu Jinghua Jiang Jiang Ma College of Materials Science and Engineering Hohai UniversityNanjing210000China Suzhou Research Institute of Hohai University Suzhou215000China Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen518060China Institute of Medical Devices(Suzhou) Southeast UniversitySuzhou215163China Institute for Advanced Study Central South UniversityChangsha410083China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing Institute of TechnologyNanjing211167China

To investigate the potential of direct ultrasonic vibration on improving the performance of magnesium alloys,this study first employed the ultrasonic vibration compression(UVC)on the solid solution treated AZ91 alloy,and explored its microstructure evolution and mechanical properties under *** only two seconds,the UVC alloys showed large deformation strains of 34.8–54.4%,and sudden increase of sample temperature to 243℃.Microstructure characterizations proved that UVC promoted the formation of abundant shear bands,fine grains,and the bimodal distribution of Mg17Al12 precipitates consisting of submicron particles located within the shear bands and nano-sized ones within the *** to the unique microstructure,the micro-hardness(and nano-hardness)value of UVC alloy was increased by 37.7%(35%)when compared with the solution-treated ***,the nano-modulus of the developed AZ91 alloy was also significantly increased to 62 GPa by statistical nanoindentation tests,which could be ascribed to increased Mg_(17)Al_(12) precipitates and decreased c/a value to some *** general,this work provides a new insight into the design and preparation of high-performance magnesium alloys by UVC at room temperature.

关键词： AZ91 alloys Ultrasonic vibration compression Precipitation Shear bands Mechanical properties

Language Cognition and Identity of Beijing and Shanghai

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教育研究前沿（中英文版） 2022年第1期12卷 70-72页

作者： luyao li Chengdu Institute Sichuan International Studies University Sichuan

Dialect is important in our live,we can find our culture and identity through *** the economic center of China,Shanghai enjoys high prosperity and rich culture,people in Shanghai have different attitude towards dialec... 详细信息

关键词： Identity Dialect Cognition Language

Preliminary Study of Pulsed Ultraviolet Technology for Low-Temperature Disinfection

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China CDC weekly 2022年第16期4卷 347-352页

作者： luyao li Tao li Jin Shen Huihui Sun Hongyang Duan Changping Zhu Wei Zhang Chen liang Baoying Zhang Yan li liubo Zhang National Institute of Environment Health Chinese Center for Disease Control and PreventionBeijingChina Chengdu Gecko Medical Technology Co. ChengduSichuan ProvinceChina

Introduction:To explore the feasibility of pulsed ultraviolet(UV)light technology for low-temperature disinfection,a series of experiments were ***:Pulsed UV technology’s effectiveness in disinfecting Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli on different carriers were studied under varying ***:Under different temperatures and constant radiation illumination(i.e.,distance),the disinfection effect was correlated with irradiation time;among the three carriers,the disinfection effect of cloth sheets was the best,followed by stainless steel sheets,and corrugated paper *** disinfection effect on Gram-negative bacteria Escherichia coli was better than that on Gram-positive bacteria Staphylococcus aureus ***:Temperature has a limited effect on pulsed UV *** times and carrier types are influencing factors.

关键词： steel effect illumination

Ultra-fast amorphization of crystalline alloys by ultrasonic vibrations

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Journal of Materials Science & Technology 2023年第11期142卷 76-88页

作者： luyao li Guo-Jian Lyu Hongzhen li Caitao Fan Wenxin Wen Hongji lin Bo Huang Sajad Sohrabi Shuai Ren Xiong liang Yun-Jiang Wang Jiang Ma Weihua Wang Guangdong Key Laboratory of Electromagnetic Control and Intelligent Robots Shenzhen UniversityShenzhen 518060China State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China National Engineering Research Center of Near-net-shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510640China Institute of Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444China School of Engineering Science University of Chinese Academy of SciencesBeijing 101408China Songshan Lake Materials Laboratory Dongguan 523808China Institute of Physics Chinese Academy of SciencesBeijing 100190China

The amorphization of alloys is of both broad scientific interests and engineering *** considered as an efficient strategy to regulate and even achieve record-breaking properties of metallic materials,a facile and rapid method to trigger solid-state amorphization is still being *** we report such a method to utilize ultrasonic vibration to trigger amorphization of intermetallic *** ultrasonic vibrations can cause tunable amorphization at room temperature and low stress(2 MPa)***,the ultrasonic-induced amorphization could be achieved in 60 s,which is 360 times faster than the ball milling(2.16×10^(4) s)with the similar proportion of *** elements redistribute uniformly and rapidly via the activated short-circuit *** experimental evidences and simulations show that the amorphous phase initiates and expands at nanograin boundaries,owing to the induction of lattice *** work provides a groundbreaking strategy for developing novel materials with tunable structures and properties.

关键词： Amorphization Ultrasonic vibration Lattice instability Elemental diffusion

Development of Cryogenic Disinfectants Using in-18℃and-40℃Environments—Worldwide,2021

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China CDC weekly 2021年第13期3卷 285-289页

作者： Huihui Sun Hongyang Duan Wei Zhang Chen liang luyao li Yuan Lyu Yanyan Chen Jin Shen liubo Zhang National Institute of Environment Health Chinese Center for Disease Control and PreventionBeijingChina.

Introduction:Since the outbreak of coronavirus disease 2019(COVID-19)in Beijing Xinfadi Wholesale Market,a series of COVID-19 outbreaks has indicated the threat of transmission due to outer surfaces of objects under low ***,2 kinds of chlorine-containing disinfectants for−18℃and−40℃were developed in order to solve the problem of low temperature ***:The properties of two cryogenic disinfectants were evaluated by low-temperature *** aureus and Escherichia coli were used as two indicator microorganisms to evaluate the effects of the two cryogenic disinfectants in the laboratory and field tests according to Technical Specifications for Disinfection(2002 version)and Test method for bactericidal effect of disinfectants in laboratory(GB/T 38502-2020).Results:Two disinfectants could remain in the liquid state at−18℃or−40℃in 72 hours without crystallization and precipitation,and the average log values of microbial reduction before and after disinfection(the average killing log value)both on Staphylococcus aureus and Escherichia coli were>3 in the laboratory and field ***:The results showed that these two disinfectants remained functional at low temperature to disinfect the packaging of imported cold chain food and surrounding packaging to prevent transmission of COVID-19 from material to people.

关键词： infect chlorine outer

Design and Implementation of Mobile Intelligent Hidden Danger Inspection System

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Modern Electronic Technology 2021年第1期5卷 15-19页

作者： Hongtao Ma Hongsheng Guo luyao li China United Coalbed Methane Co. Ltd.Beijing100016China School of Ocean and Spatial Information China University of Petroleum(East China)QingdaoShandong266580China

With the increasing development of Internet technology,computer Internet,intelligent terminal,cloud computing and other new technologies continue to *** kinds of app based on mobile intelligent terminal are widely used because of its convenience and ***,for the safety of the coal industry,how to use these technologies based on mobile intelligent terminal to establish a set of efficient long-term mechanism of safety inspection and risk control is a necessary method to upgrade the safety management ***,in order to meet the requirements of hidden danger investigation and management,this paper designs an intelligent hidden danger investigation and management *** on Ionic,the system constructs a cross platform mixed mode mobile app development *** paper shows that the system can realize the basic hidden danger investigation requirements.

关键词： Internet System design Mobile intelligent terminal Hidden danger

Efficacy of Online Learning and Influence on Skin and Eyes Among College Students

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International Journal of Plant Engineering and Management 2024年第1期29卷 14-27页

作者： LUAN Mei li luyao CHEN Jianan ZHAO Yixin HE qiannan Department of Dermatology the Frist Affiliated Hospital of Xi′an Jiaotong UniversityXi′an 710061China Department of Pathology the First Affiliated Hospital of Xi′an Jiaotong UniversityXi′an 710061China

To evaluate the efficacy of online learning and explore the impact of long-term use of electronic products on facial skin as well as eyes.A cross-sectional survey was conducted to 180 sophomores in Xi′an Jiaotong University by cluster random sampling from September to October *** questionnaire covering study condition,skin lesion and Ocular Surface Disease Index.χ_(2) test was used to compare the facial skin condition among different groups,and spearman correlation test was used to test the correlation of rank *** online education,students′learning pressure is reduced,their autonomy is improved,and the learning efficiency is *** were differences in the incidence of facial itching and papules among different *** of use of electronic products was positively correlated with the facial itching,with an r value of 0.231(Plight protection groups(12.8%)was higher than that in blue light protection groups(1.7%),the difference was statistically significant(χ_(2)=8.384,Pline ***-term use of electronic products and no blue light protection have an impact on facial *** should enhance the knowledge of skin-care and eye-care and develop better habits.

关键词： online learning facial skin dry eye college students

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CRTSⅢ型无砟轨道板智能精调系统研发

铁道标准设计 2022年第10期66卷 48-51页

作者：李路遥中铁第四勘察设计院集团有限公司武汉430063 铁路轨道安全服役湖北省重点实验室武汉430063

CRTSⅢ型无砟轨道板精调传统作业方式以人工操作为主,劳动强度大、受工人主观因素影响较强。为提高无砟轨道施工的自动化和智能化水平,研发了可远程控制,具备自动化测量、轨道板姿态调整量计算、轨道板几何形位自动调整的轨道板智能精... 详细信息

CRTSⅢ型无砟轨道板精调传统作业方式以人工操作为主,劳动强度大、受工人主观因素影响较强。为提高无砟轨道施工的自动化和智能化水平,研发了可远程控制,具备自动化测量、轨道板姿态调整量计算、轨道板几何形位自动调整的轨道板智能精调系统,其由测量子系统、伺服驱动子系统、管控平台等部分组成。运用精调测量手簿实现了远程无线控制全站仪进行精调测量,实现了以轨道板铺设精准三维坐标为驱动的轨道板智能精调作业。提出轨道板的三相精调器结构,进一步提升了精调的稳定性。构建精调管控平台,实现了精调全过程的监控、分析,为精调管理提供了信息化手段。该系统相比传统工艺在施工效率、精度方面具有明显提升,同时降低了劳动强度,提升了施工智能化水平,对建设智能高速铁路起到一定支撑作用。

关键词：高速铁路 CRTSⅢ型板式无砟轨道轨道板精调智能装备信息化管控平台

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Ultrasonic vibration enabled under-liquid forming of metallic glasses

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Science Bulletin 2024年第2期69卷 163-166页

作者： Xin li luyao li Sajad Sohrabi Jia'nan Fu Zhen li Zhe Chen Rongce Sun Yu Zhang Jinbiao Huang Heting Zhang Jian Zhu Xiangyan Chen Kaikai Song Jiang Ma School of Mechanical Electrical&Information EngineeringShandong UniversityWeihai 264209China State Key Laboratory of Radio Frequency Heterogeneous Integration College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen 518055China Shenzhen Research Institute of Shandong University Shenzhen 518057China

Advancements in forming technology offer significant advantages for the manufacturing industry,including enhanced efficiency,energy conservation,and improved material utilization[1].However,traditional additive manufacturing[2],thermoplastic forming[3],and laser cutting[4]encounter challenges when applied in under-liquid environments,mainly due to difficulties in temperature control and heat source provision.

关键词： glasses liquid metallic