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Effect of Initial Microstructure Prior to Extrusion on the Microstructure and Mechanical Properties of Extruded AZ80 Alloy with a Low Temperature and a Low Ratio

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Chinese Journal of Mechanical Engineering 2023年第3期36卷 339-349页

作者： Hang Zhang Haipeng Li Rongguang Li boshu liu Ruizhi Wu Dongyue Zhao Shanshan Li School of Mechanical and Power Engineering Shenyang University of Chemical TechnologyShenyang 110142China Key Laboratory of Superlight Materials&Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China

Magnesium(Mg)alloys are the lightest metal structural material for engineering applications and therefore have a wide market of ***,compared to steel and aluminum alloys,Mg alloys have lower mechanical properties,which greatly limits their *** is one of the most important processing methods for Mg and its ***,the effect of such a heterogeneous microstructure achieved at low temperatures on the mechanical properties is lacking *** this work,commercial AZ80 alloys with different initial microstructures(as-cast and as-homogenized)were selected and extruded at a low extrusion temperature of 220℃and a low extrusion ratio of *** microstructure and mechanical properties of the two extruded AZ80 alloys were *** results show that homogenized-extruded(HE)sample exhibits higher strength than the cast-extruded(CE)sample,which is mainly attributed to the high number density of fine dynamic precipitates and the high fraction of recrystallized ultrafine *** to the coarse compounds existing in CE sample,the fine dynamical precipitates of Mg17(Al,Zn)12form in the HE sample can effectively promote the dynamical recrystallization during extrusion,while they exhibit a similar effect on the size and orientation of the recrystallized *** results can facilitate the designing of high-strength wrought magnesium alloys by rational microstructure construction.

关键词： Magnesium alloy Low temperature and low ratio extrusion Bimodal grain structure Dynamic precipitate Dynamic recrystallization

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Microstructure and Mechanical Property of Mg‑13Gd‑0.2Ni Alloy Processed by Extrusion and Aging

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Acta Metallurgica Sinica(English Letters) 2024年第8期37卷 1367-1376页

作者： Hang Zhang Jiaying Zhao Rongguang Li boshu liu Shanshan Li Sha Sha Yuehong Zhang Man Xu Yan Tang School of Mechanical and Power Engineering Shenyang University of Chemical TechnologyShenyang 110142China Instrumental Analysis Center Shenyang University of Chemical TechnologyShenyang 110142China

In this work,a good combination of strength and ductility is achieved in a Mg-13Gd-0.2Ni alloy by conventional extrusion and following aging *** aged Mg-13Gd-0.2Ni alloy exhibits a yield strength(YS)of 363 MPa,an ultimate tensile strength(UTS)of 433 MPa,and an elongation of 11.9%.The aged Mg-13Gd-0.2Ni alloy contains a microstructure with a 95%proportion of dynamically recrystallized(DRXed)grains with a micron size,weak texture,and a high number density of prismaticβ′precipitates within *** bulk compounds enriched with Ni element which are mainly formed during casting and stable in the extruded and aged *** dynamic compounds are formed during extrusion,and a high density of prismaticβ′precipitates are formed during *** high density of prismaticβ′precipitates results in a significant increase in the strength of the Mg-13Gd-0.2Ni alloy,and the YS and UTS are increased by 153 and 136 MPa,*** high proportion of DRXed grains with a weak texture contributes mainly to the high ductility and the fine compounds with a low density at grain boundaries formed during aging have no significant adverse effect on ductility of the aged Mg-13Gd-0.2Ni *** findings for the novel Mg-Gd-Ni alloy can provide guidance for the design of wrought Mg alloys with superior mechanical properties.

关键词： Mg-Gd-Ni alloy Extrusion Aging Strength Ductility

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Effect of a homogeneous recrystallized microstructure and a bimodal microstructure on mechanical properties in Mg-5Zn-0.6Zr alloys

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Resources Chemicals and Materials 2023年第3期2卷 208-214页

作者： Hang Zhang Xiang Xiao Rongguang Li Di Wu Ruizhi Wu boshu liu Shanshan Li Jingren Li School of Mechanical and Power Engineering Shenyang University of Chemical TechnologyShenyang 110142China Key Laboratory of Superlight Materials&Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China

For typical Mg-Zn-Zr alloys,exhilaratingly high strength of a yield strength(YS)higher than 300 MPa can hardly be attained by traditional *** this paper,we compare the mechanical properties and strengthening mecha-nisms of the Mg-5Zn-0.6Zr alloys having a homogeneous dynamical recrystallized microstructure and a bimodal microstructure with high-density nano *** Mg-5Zn-0.6Zr alloy with the bimodal microstructure(rolled at 150℃ with a thickness reduction of 60%)exhibits a YS of 332 MPa,an ultimate tensile strength(UTS)of 360 MPa,and an elongation of 5%.The high strength is attributed to the microstructure with high-density nano substructures,high-density nano(Mg,Zr)Zn_(2) precipitates,ultrafine recrystallized grains,and strong basal *** comparison,the Mg-5Zn-0.6Zr alloy with homogeneous microstructure(rolled at 200℃ with a thick-ness reduction of 70%)exhibits a YS of 209 MPa,an UTS of 317 MPa,and an elongation of 17%,which contains coarser recrystallized grains,coarser precipitates,weaker texture,and lower density of dislocations,further re-sulting in low *** difference between the strengthening mechanism in two kinds of microstructure is discussed in *** results facilitate the preparation of wrought Magnesium alloy with high strength by reasonable microstructure construction.

关键词： Magnesium alloy Nano substructures Nano precipitates Bimodal grain structure Dynamical recrystallization

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计算机安全技术在企业信息管理中的应用

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现代工业经济和信息化 2022年第11期12卷 93-95页

作者：刘博舒中粮生化能源(肇东)有限公司黑龙江肇东151100

信息管理既为企业带来了便捷、高效等促进企业发展的优势,也产生了信息泄露、数据盗窃等不利影响。为保证企业信息管理的安全性和严密性,使企业数据不受破坏以及窃取,造成企业严重损失,必须严格重视计算机安全技术在企业信息管理中的应... 详细信息

信息管理既为企业带来了便捷、高效等促进企业发展的优势,也产生了信息泄露、数据盗窃等不利影响。为保证企业信息管理的安全性和严密性,使企业数据不受破坏以及窃取,造成企业严重损失,必须严格重视计算机安全技术在企业信息管理中的应用。通过加密、入侵检测技术、防病毒技术等措施能够有效阻止病毒、木马以及黑客攻击,从而达到保护信息管理的目的。

关键词：计算机安全技术信息管理企业应用

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Mg_(91.4)Zn_(7.2)Y_(1.4)合金中的相变及相平衡

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材料与冶金学报 2016年第2期15卷 128-131页

作者：刘博书李洪晓任玉平蒋敏秦高梧东北大学材料各向异性与织构教育部重点实验室沈阳110819

采用热分析以及合金平衡组织结构分析,对Mg-Zn-Y系Mg_(91.4)Zn_(7.2)Y_(1.4)合金中的相变及其相关相平衡进行了研究.结果表明,Mg_(91.4)Zn_(7.2)Y_(1.4)合金在440℃时处于α-Mg固溶体和准晶I的两相平衡;450℃时处于α-Mg固溶体、液相Li... 详细信息

采用热分析以及合金平衡组织结构分析,对Mg-Zn-Y系Mg_(91.4)Zn_(7.2)Y_(1.4)合金中的相变及其相关相平衡进行了研究.结果表明,Mg_(91.4)Zn_(7.2)Y_(1.4)合金在440℃时处于α-Mg固溶体和准晶I的两相平衡;450℃时处于α-Mg固溶体、液相Liq和三元化合物W的三相平衡.Mg_(91.4)Zn_(7.2)Y_(1.4)合金在446.8℃时发生了I+α-Mg→Liq+W四相包共晶转变.温度超过477.3℃,Mg_(91.4)Zn_(7.2)Y_(1.4)合金中W相不再稳态存在,500℃时合金处于α-Mg和液相两相平衡.

关键词： Mg-Zn-Y系相变相平衡

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提高有机硫加氢催化剂转化性能的研究

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能源化工 2019年第2期40卷 42-45页

作者：单红飞刘博书倪雪梅赵素云沈阳三聚凯特催化剂有限公司辽宁沈阳110144

针对目前工业上采用焦化气制备甲醇过程中原料气中硫含量较高的问题,采用等量浸渍法,以氧化铝为载体,氧化钼为主活性组分,Y2和Y3为助剂制备了有机硫加氢催化剂。考察了不同质量分数活性组分催化剂的加氢活性,得到主活性组分氧化钼的最... 详细信息

针对目前工业上采用焦化气制备甲醇过程中原料气中硫含量较高的问题,采用等量浸渍法,以氧化铝为载体,氧化钼为主活性组分,Y2和Y3为助剂制备了有机硫加氢催化剂。考察了不同质量分数活性组分催化剂的加氢活性,得到主活性组分氧化钼的最佳质量分数为13.90%,助剂Y2的最佳质量分数为2.49%,Y3最佳质量分数为0.63%。在最佳条件下制备的有机硫加氢催化剂的有机硫脱除效果较好,其中2,3-二甲基-2-丁烯转化率达到88.97%,噻吩转化率达到50.67%,与现有T202A催化剂相比,2,3-二甲基-2-丁烯转化率提高了7.15%,噻吩转化率提高了9.41%。

关键词：有机硫加氢催化剂转化率性能

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Mg-10.7 wt.%Gd合金时效析出行为研究

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中国体视学与图像分析 2020年第4期25卷 346-352页

作者：刘博书王昕任玉平李洪晓蒋敏秦高梧东北大学材料科学与工程学院材料各向异性与织构教育部重点实验室沈阳110819

本文利用透射电子显微镜(Transmission Electron Microscopy,TEM)和维氏显微硬度计,研究了Mg-10.7 wt.%Gd二元合金180℃时效时在欠时效、峰时效和过时效阶段析出相的特征。结果发现,Mg-10.7 Gd合金在180℃时效强化效应显著,时效298 h后... 详细信息

本文利用透射电子显微镜(Transmission Electron Microscopy,TEM)和维氏显微硬度计,研究了Mg-10.7 wt.%Gd二元合金180℃时效时在欠时效、峰时效和过时效阶段析出相的特征。结果发现,Mg-10.7 Gd合金在180℃时效强化效应显著,时效298 h后硬度达到峰值。β’相是合金的主要强化相,沿(2110)Mg、(2110)Mg;和(1120)Mg三个晶面方向析出,绕[0001]Mg晶带轴形成120°旋转对称的三变体。在时效初期,基体中有20 nm左右的碟状亚稳相β"析出。时效时间延长至63 h,β"相呈颗粒状,同时基体中有少量短条状β’相存在。当时间达到500 h,发生过时效。β’相明显长大,多个β’相以链状连接,围绕[0001]Mg晶带轴呈三角形排列分布,同时基体中有针状相析出。

关键词：镁合金时效析出镁-钆选区电子衍射技术

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Microscopic mechanisms analysis of various dielectric response processes in oil-paper insulation with different insulating states

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High Voltage 2024年第3期9卷 591-600页

作者： Zaijun Jiang Jiefeng liu Xianhao Fan Heng Zhang Enze Zhang boshu Song Yiyi Zhang School of Electrical Engineering Guangxi UniversityNanningGuangxiChina

Various dielectric response processes in the oil-paper insulation are sensitively affected by the insulating states(ageing degrees and moisture contents).However,the existing research is still incomplete in revealing the microscopic mechanisms of various dielectric response processes in oil-paper insulation with different insulating *** this issue,the genetic algorithm is first adopted to extract the Dissado–Hill(D–H)model parameters by simulating the frequency domain spectroscopy(FDS)of oil-paper ***,the change laws of the extracted D–H model parameters are adopted to reveal the microscopic mechanisms of various dielectric response *** mechanisms of four dielectric response processes are studied,which are quasi-dc relax-ation,loss peak relaxation,optical frequency relaxation,and DC ***,due to the dielectric response processes being dominated by various polar particles(methanol,ethanol,furfural,and water molecule),the contents of various ageing by-products dissolved in the insulating oil are measured to support the above *** this respect,a dielectric theoretical reference for the FDS technique to research the insulating states of oil-paper insulation is provided.

关键词： mechanisms insulation relaxation

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Highly efficient heritable genome editing in wheat using an RNA virus and bypassing tissue culture.

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Molecular Plant 2021年第11期14卷 1787-1798页

作者： Tingdong Li Jiacheng Hu Yu Sun boshu Li Dingliang Zhang Wenli Li Jinxing liu Dawei Li Caixia Gao Yongliang Zhang Yanpeng Wang State Key Laboratory of Agro-Biotechnology and Ministry of Agriculture Key Laboratory of Soil Microbiology College of Biological SciencesChina Agricultural UniversityBeijingChina State Key Laboratory of Plant Cell and Chromosome Engineering Center for Genome EditingInstitute of Genetics and Developmental BiologyThe Innovative Academy of Seed DesignChinese Academy of SciencesBeijingChina College of Advanced Agricultural Sciences University of Chinese Academy of SciencesBeijingChina College of Life Sciences University of Chinese Academy of SciencesBeijingChina

Genome editing provides novel strategies for improving plant traits,but relies on current genetic transformation and plant regeneration procedures,which can be *** have engineered a barley stripe mosaic virus(BSMV)-based sgRNA delivery vector(BSMV-sg)that is effective in performing heritable genome editing in Cas9-transgenic wheat *** progenies were present in the next generation at frequencies ranging from 12.9%to 100%in three different wheat varieties,and 53.8%to 100%of mutants were *** also achieved multiplex mutagenesis in progeny using a pool of BSMV-sg vectors harboring different ***,we devised a virus-induced transgene-free editing procedure(VITF-Edit)to generate Cas9-free wheat mutants by crossing BSMV-infected Cas9-transgenic wheat pollen with wild-type *** study provides a robust,convenient and tissue culture-free approach for genome editing in wheat through virus infection.

关键词： heritable genome editing BSMV common wheat tissue culture-free multiplex editing

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Low-temperature photothermal-induced alkyl radical release facilitates dihydroartemisinin-triggered“valve-off”starvation therapy

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Asian Journal of Pharmaceutical Sciences 2023年第5期18卷 152-163页

作者： Xiaomin Su boshu Ouyang Yao liu Yang Wang Ruizhe Xu Lili Niu Nannan Li Ce Xu Zanya Sun Huishu Guo Zhiqing Pang Xiangrong Yu Central Laboratory First Affiliated HospitalInstitute(College)of Integrative MedicineDalian Medical UniversityDalian 116021China Department of Radiology Zhuhai People’s HospitalZhuhai Hospital affiliated with Jinan UniversityZhuhai 519000China Department of Integrative Medicine Huashan HospitalFudan UniversityShanghai 200040China The Institute for Translational Nanomedicine Shanghai East HospitalTongji University School of MedicineShanghai 200120China School of Pharmacy&Key Laboratory of Smart Drug Delivery Fudan UniversityShanghai 201203China

The high nutrient and energy demand of tumor cells compared to normal cells to sustain rapid proliferation offer a potentially auspicious avenue for implementing starvation ***,conventional starvation therapy,such as glucose exhaustion and vascular thrombosis,can lead to systemic toxicity and exacerbate tumor ***,we developed a new“valve-off”starvation tactic,which was accomplished by closing the valve of glucose transporter protein 1(GLUT1).Specifically,dihydroartemisinin(DHA),2,20-azobis[2-(2-imidazolin-2-yl)propane]dihydrochloride(AI),and Ink were co-encapsulated in a sodium alginate(ALG)*** irradiation with the 1064 nm laser,AI rapidly disintegrated into alkyl radicals(R·),which exacerbated the DHA-induced mitochondrial damage through the generation of reactive oxygen species and further reduced the synthesis of adenosine triphosphate(ATP).Simultaneously,the production of R·facilitated DHA-induced starvation therapy by suppressing GLUT1,which in turn reduced glucose *** in vivo and in vitro results suggested that this radical-enhanced“valveoff”strategy for inducing tumor cell starvation was effective in reducing glucose uptake and ATP *** integrated strategy induces tumor starvation with efficient tumor suppression,creating a new avenue for controlled,precise,and concerted tumor therapy.

关键词： Starvation therapy Alkyl radicals Hydrogel Ink Low-temperature photothermal

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