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Observing strain glass transition in Ti_(33)Nb_(15)Zr_(25)Hf_(25)O_(2)high entropy alloy with Elinvar effect

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Journal of Materials Science & Technology 2024年第1期168卷 16-23页

作者： kaichao zhang Kai Wang Bin Wang Chao Lv Jiaxing Zheng Guanqi Li Yu Fu Wenlong Xiao Qingqing Cai Xutao Nie Yingfeng Shao Huilong Hou Xinqing Zhao School of Materials Science and Engineering Beihang UniversityBeijing 100191China China Aerodynamics Research and Development Center Mianyang 621000China State Key Laboratory of Nonlinear Mechanics Chinese Academy of SciencesInstitute of MechanicsBeijing 100190China Tianmushan Laboratory(Zhejiang Provincial Laboratory for Aviation) Hangzhou 310000China

Exploring the phase transition of high entropy alloys(HEAs)with multiple major elements is of great importance for understanding the underlying physical *** martensitic phase tran-sition has been frequently reported in HEAs,however,nanoscale microstructural phase evolution has not been investigated to the same ***,we have prepared the Ti_(33)Nb_(15)Zr_(25)Hf_(25)O_(2)HEA and investi-gated the strain glass transition and its associated properties using dynamic mechanical analysis and mi-crostructure *** have found that the elastic modulus in Ti_(33)Nb_(15)Zr_(25)Hf_(25)O_(2)HEA deviates from Wachtman’s equation and observed the Elinvar effect in the form of temperature-independent mod-ulus in the temperature range from 150 K to 450 K and frequency-dependence modulus around 220 *** strain glass transition has been evidenced in Ti_(33)Nb_(15)Zr_(25)Hf_(25)O_(2)HEA by the formation and growth of nano-sized domains during in-situ transmission electron microscopy(TEM)cooling,and substantiated by the broken ergodicity during zero-field-cooling/*** strain glass transition is believed to account for the Elinvar effect,where the modulus hardening of nano-sized domains compensates dynam-ically with the modulus softening of the transformable matrix.

关键词： High entropy alloys Strain glass transition Elinvar effect Microstructural evolution Nanodomains

Targeted inhibition of osteoclastogenesis reveals the pathogenesis and therapeutics of bone loss under sympathetic neurostress

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International Journal of Oral Science 2022年第4期14卷 479-488页

作者： Bingdong Sui Jin Liu Chenxi Zheng Lei Dang Ji Chen Yuan Cao kaichao zhang Lu Liu Minyan Dang Liqiang zhang Nan Chen Tao He Kun Xuan Fang Jin Ge zhang Yan Jin Chenghu Hu State Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi International Joint Research Center for Oral Diseases Center for Tissue EngineeringSchool of StomatologyThe Fourth Military Medical UniversityXi'anChina Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases School of Chinese MedicineHong Kong Baptist UniversityHong Kong SARChina Xi'an Key Laboratory of Stem Cell and Regenerative Medicine Institute of Medical ResearchNorthwestern Polytechnical UniversityXianChina Xi'an Institute of Tssue Engineering and Regenerative Medicine XianChina Department of Biochemistry and Molecular Biology School of Basic Medical SciencesXi'an Jiaotong UniversityXi'anChina

Sympathetic cues via the adrenergic signaling critically regulate bone homeostasis and contribute to neurostress-induced bone loss,but the mechanisms and therapeutics remain incompletely ***,we reveal an osteoclastogenesis-centered functionally important osteopenic pathogenesis under sympatho-adrenergic activation with characterized micro RNA response and efficient *** discovered that osteoclastic mi R-21 was tightly regulated by sympatho-adrenergic cues downstream theβ2-adrenergic receptor(β2AR)signaling,critically modulated osteoclastogenesis in vivo by inhibiting programmed cell death 4(Pdcd4),and mediated detrimental effects of both isoproterenol(ISO)and chronic variable stress(CVS)on ***,without affecting osteoblastic bone formation,bone protection against ISO and CVS was sufficiently achieved by a(D-Asp8)-lipid nanoparticle-mediated targeted inhibition of osteoclastic mi R-21 or by clinically relevant drugs to suppress ***,these results unravel a previously underdetermined molecular and functional paradigm that osteoclastogenesis crucially contributes to sympatho-adrenergic regulation of bone and establish multiple targeted therapeutic strategies to counteract osteopenias under stresses.

关键词： osteoclast pathogenesis homeostasis

Microstructural evolution in the surface of Ti-10V-2Fe-3Al alloy by solution treatments

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Progress in Natural Science:Materials International 2020年第1期30卷 106-109页

作者： Lichun Qi Xaichao zhang Xueliang Qiao Lijun Huang Xu Huang Xinqing Zhao School of Materials Science and Engineering Beihang University Institute of Titanium Alloy Beijing Institute of Aeronautical Materials

By solution treatments in vacuum and in air,the surface region of Ti-10V-2Fe-3Al exhibits different microstructures from the interior region of the *** solution treated in vacuum,the microstructure of the specimen is composed of dominant β phase and a few of α " martensite in surface region,with a large amount of α" martensite and a little of β phase in *** solution treated in air,the specimen is characterized by dominant surficial a phase and interior β *** addition,the lattice parameter evolutions of a and β phases were observed in the surface region of the specimens by solution treatment in *** mechanism for the surface effects is discussed in light of the structural stability and phase evolution in Ti-10V-2Fe-3Al alloy with solution treatments.

关键词： Ti-10V–2Fe–3Al Microstructural evolution X-ray diffraction Solution treatment

Fe改性的组合型Pt/C催化剂的制备及其在邻氯硝基苯加氢中的应用

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石油化工 2012年第5期41卷 515-519页

作者：张凯超黄忠斌赵磊严新焕浙江工业大学绿色化学合成技术国家重点实验室培育基地浙江杭州310014

采用吸附法制备了过渡金属改性的组合型Pt-M/C(M=Fe,Sn,Ce,Ni;C表示活性炭)催化剂,通过TEM和XPS方法对催化剂的表面形态、金属负载量、金属电子价态及Pt纳米颗粒的分布进行了表征;以邻氯硝基苯催化加氢合成邻氯苯胺为探针反应,考察了Pt-... 详细信息

采用吸附法制备了过渡金属改性的组合型Pt-M/C(M=Fe,Sn,Ce,Ni;C表示活性炭)催化剂,通过TEM和XPS方法对催化剂的表面形态、金属负载量、金属电子价态及Pt纳米颗粒的分布进行了表征;以邻氯硝基苯催化加氢合成邻氯苯胺为探针反应,考察了Pt-M/C催化剂的选择性加氢性能。实验结果表明,Fe助剂的改性效果最佳,当m(Fe)∶m(Pt)=2时,Pt-M/C催化剂具有较佳的催化性能,在1.0 MPa、60℃的反应条件下,邻氯硝基苯转化率为100%,转换频率为78 s-1,邻氯苯胺的选择性高达99.5%。向反应体系中引入Fe3+也能较好地提高Pt/C催化剂的加氢性能,但会引入杂质,降低产物的品质。

关键词：铂/活性炭催化剂铁助剂邻氯硝基苯邻氯苯胺催化加氢

THE RESEARCH OF MIXED PRODUCT LINES OF MATERIAL DELIVERING SYSTEM DRAWN BY ORDERS

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THE RESEARCH OF MIXED PRODUCT LINES OF MATERIAL DELIVERING S...

2005年中国机械工程学会年会

作者： HOU Kaihu, YU kaichao, zhang Yu (Dep. of Industry and Engineering, Faculty of mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming, 650093, China)

＜正＞To deal with mode of production small lot size and more varieties, the system of mixed production lines of material delivering system drawn by order was discussed. Firstly, the model of mixed production lines of material delivering system drawn by orders was build. Secondly, the logic of processing of the model was studied. To realize delivering components to production line in JIT＆PDT, three disposing ways were presented. Thirdly, Disposing flow of this system models were analyzed. Finally, The physical structure and function of the system was put forward.

关键词： delivering material system mixed product lines information technology

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城市道路低位照明的设计理念与实践探讨

中国照明电器 2023年第8期 53-55,60页

作者：罗刚张凯超中国市政工程中南设计研究总院有限公司湖北武汉430014

本文针对城市道路低位照明的设计理念与实践进行了探讨。首先,介绍了城市道路照明的历史演变和现状,指出低位照明在城市道路照明中的重要性和优势。然后,从设计理念的角度,阐述了低位照明的目标、原则和方法,并结合实例进行了详细说明... 详细信息

本文针对城市道路低位照明的设计理念与实践进行了探讨。首先,介绍了城市道路照明的历史演变和现状,指出低位照明在城市道路照明中的重要性和优势。然后,从设计理念的角度,阐述了低位照明的目标、原则和方法,并结合实例进行了详细说明。最后,从实践角度,讨论了低位照明在城市道路中的应用,并分析了其在实际工程中的经验和问题。通过本文的探讨,对城市道路低位照明的设计和实践提供了一定的理论和实践指导。

关键词：城市道路低位照明设计理念实践探讨城市照明

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顶底角钢螺栓节点有限元分析

安徽建筑 2006年第4期13卷 105-106页

作者：张开超温柔淮北矿业集团杨庄煤矿安徽淮北235025 合肥工业大学土木建筑工程学院安徽合肥230009

对顶底角钢梁柱半刚性连接进行了精细的三维有限元分析,得出了此类连接节点在单向荷载作用下的应力发展状况、应力分布以及破坏形式,同时对有限元分析结果与试验结果做出了比较,得到了一些有价值的结论。

关键词：半刚性顶底角钢有限元弯矩-转角曲线

基于乘客密度的12m城市客车座椅数目确定方法

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交通信息与安全 2021年第4期39卷 151-156页

作者：闫晟煜赵转转张凯超张子健长安大学汽车学院西安710064 陕西交通职业技术学院汽车工程学院西安710018

为选用合理的座椅布置来适应运营时段内客流的变化,提高城市客车服务能力,调查了坐姿乘客在车厢地板上的平均投影面积,明确了划分不同运营时段的判别准则,提出了1种综合考虑坐姿和站立乘客的乘客密度指数,分析了车上人数和高峰流量系数... 详细信息

为选用合理的座椅布置来适应运营时段内客流的变化,提高城市客车服务能力,调查了坐姿乘客在车厢地板上的平均投影面积,明确了划分不同运营时段的判别准则,提出了1种综合考虑坐姿和站立乘客的乘客密度指数,分析了车上人数和高峰流量系数对座椅数目最优解的影响;提出了公交线路上采用单一座椅布置情形下的12m城市客车最优座椅数目确定方法,分析了座椅布置与运营时段之间的匹配方法,运用西安市7条公交线路的客流数据验证了模型的可行性,分析了3种常见座椅布置对运营时段和线路属性的适应性。结果表明:坐姿乘客在车厢地板上的平均投影面积为0.35 m2/人;高峰客流系数是影响12 m城市客车座椅数目的关键因素;公交线路单一座椅布置的座椅数目推荐值为21~43座;控制实际座椅数目与最优解的偏差在2个座位以内且满足通用布置原则要求时,可使座椅布置适配公交线路的效果达到最佳。

关键词：城市交通城市客车乘客密度座椅数目高峰客流量系数

Ti-10V-2Fe-3Al合金的结构稳定性、微观组织及力学行为

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航空材料学报 2020年第3期40卷 110-117页

作者：齐立春张凯超肖文龙黄旭赵新青中国航发北京航空材料研究院钛合金研究所北京100095 北京航空航天大学材料科学与工程学院北京100191

采用真空自耗熔炼及锻造方法制备Ti-10V-2Fe-3Al(Ti-1023)合金,利用X射线衍射、透射电子显微观察和力学性能测试等研究合金的结构稳定性以及冷轧变形合金的微观组织演变及力学行为。结果表明,Ti-1023合金的结构稳定性、微观组织和力学... 详细信息

采用真空自耗熔炼及锻造方法制备Ti-10V-2Fe-3Al(Ti-1023)合金,利用X射线衍射、透射电子显微观察和力学性能测试等研究合金的结构稳定性以及冷轧变形合金的微观组织演变及力学行为。结果表明,Ti-1023合金的结构稳定性、微观组织和力学行为与冷轧变形及热处理密切相关。无论是单相区(833℃)固溶后水冷还是两相区(753℃)固溶后水冷,合金的应力-应变曲线均呈现"双屈服"特征。这表明单相区或两相区固溶水冷后的β相均呈现较低的结构稳定性,在应力作用下产生应力诱发α"马氏体相变,从而导致合金的"双屈服"行为。剧烈冷轧变形和应力/应变诱发α"马氏体相变均可使β相晶粒细化,同时也伴随马氏体进一步细化。由于冷轧变形引入的大量位错、晶界和相界等缺陷可作为α相的形核位置,冷轧态Ti-1023合金经550℃短时时效即可析出大量细小的α相,合金因此呈现良好的强度和塑性匹配。

关键词： Ti-10V-2Fe-3Al 结构稳定性冷轧变形马氏体相变力学行为