检索结果-南通市图书馆

Brazing of C/C composite and Ti-6Al-4V with graphene strengthened AgCuTi filler:Effects of graphene on wettability,microstructure and mechanical properties

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2018年第7期31卷 1602-1608页

作者： Duo LIU Yanyu SONG yinghao zhou Xiaoguo SONG Wei FU Jicai FENG State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Shandong Provincial Key Laboratory of Special Welding Technology Harbin Institute of Technology at Weihai

Graphene nanosheets（GNSs） strengthened AgCuTi composite filler（AgCuTiG） was used to braze C/C composite and Ti-6Al-4V. The effects of GNSs on the wettability of AgCuTiG filler on the C/C composite surface and the interfacial microstructure and mechanical properties of brazed joints were investigated. The results indicate that the addition of GNSs reduced the wettability of AgCuTiG. The interfacial microstructure of brazed joints evolved with the addition of GNSs, where Ti3Cu4 and TiCu4 were converted to TiCu and the thickness of the reaction layer adjacent to the base material decreased. The maximum shear strength of joints brazed at 0.3 wt% GNSs was 23.3 MPa（880℃/10 min）. Further adding GNSs deteriorated the shear strength of the joints. Fracture of the joints occurred in the C/C composite substrate and the TiC layer adjacent to C/C composite.

关键词： Brazing Graphene nanosheets Mechanical properties Microstructure Wetting

Fabricating CoCrFeMnNi high entropy alloy via selective laser melting in-situ alloying

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第8期36卷 40-43页

作者： Peng Chen Sheng Li yinghao zhou Ming Yan Moataz M.Attallah Advanced Materials Processing Laboratory University of BirminghamBirmingham B152TTUK Department of Materials Science and Engineering and Shenzhen Key Laboratory for Additive Manufacturing of High Performance MaterialsSouthern University of Science and TechnologyShenzhen 518055China

Quasi-equiatomic Co Cr Fe Mn Ni high entropy alloy(HEA)has been in-situ alloyed by selective laser melting(SLM)from a blend of Co Cr Fe Ni pre-alloyed powder and Mn elemental *** blended powder shows good printability with various SLM parameters and the as-built HEA samples achieve a reliable forming *** the slight evaporation of Mn,energy dispersive spectrometer mapping and Xray diffraction results show that the as-built HEA has a homogeneous chemical distribution and presents a single face-centred-cubic(fcc)phase,indicating successful in-situ *** study has verified the feasibility of using blended powder to prepare high-quality HEA by SLM.

关键词： High entropy alloys Laser processing Selective laser melting In-situ alloying CoCrFeMnNi Crystal structure

Heat treatment of hot-isostatic-pressed 60NiTi shape memory alloy:Microstructure,phase transformation and mechanical properties

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第12期107卷 124-135页

作者： yinghao zhou Xiyu Yao Wenfei Lu Dandan Liang Xiaodi Liu Ming Yan Jun Shen College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China Department of Materials Science and Engineering Shenzhen Key Laboratory for Additive Manufacturing of High-performance MaterialsSouthern University of Science and TechnologyShenzhen 518055China

60NiTi alloy is considered to be a promising material for specialized bearing and gear applications due to its high hardness,strength,and low ***,fabricating 60NiTi through conventional processing methods is challenging due to the brittleness and poor *** this study,60NiTi with high relative density was successfully fabricated directly from pre-alloyed powder through hot isostatic *** effects of solution and aging treatments on microstructure and mechanical properties were systematically studied by advanced characterization *** hot-isostatic-pressed 60NiTi showed low average hardness and elastic strain due to the formation of a soft Ni_(3)Ti phase and B2 NiTi *** treatment above 1000℃dissolved the Ni_(3)Ti phase and promoted the formation of nanoscale Ni_(4)Ti_(3)precipitates,which significantly improved the hardness,strength,and elastic strain of *** formation of the Ni_(4)Ti_(3) phase can be mainly attributed to the driving forces induced by the chemical supersaturation and mechanical stress ***,the phase transformation mechanisms during heat treatment and compression test were discussed.

关键词： Ni-rich 60NiTi Hot isostatic pressing Heat treatment Phase transformation Mechanical properties

Effects of Annealing Below Glass Transition Temperature on the Wettability and Corrosion Performance of Fe-based Amorphous Coatings

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2022年第2期35卷 243-253页

作者： Dandan Liang Xiaodi Liu yinghao zhou Yu Wei Xianshun Wei Gang Xu Jun Shen College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China College of Materials Science and Engineering Tongji UniversityShanghai 201804China

This study investigated the effect of annealing below glass transition temperature(T_(g))on the microstructural characteristics,mechanical property,wettability,and electrochemical performance of activated combustion-high velocity air fuel(AC-HVAF)-sprayed Fe-Cr-Mo-W-C-B-Y amorphous coatings(ACs).Results showed that Fe-based ACs with a thickness of~300μm exhibited a fully amorphous structure with low *** from the reduced free volume,sub-T_(g) annealing increased the thermal stability,hardness,and surface hydrophobicity of Fe-based *** enhanced corrosion resistance of sub-T_(g) annealed ACs in 3.5 wt%NaCl solution was attributed to the increased surface hydrophobicity and passivation *** finding elucidates the correlation between sub-T_(g) annealing and the properties of Fe-based ACs,which promotes ameliorating ACs with superior performance.

关键词： Activated combustion-high velocity air fuel(AC–HVAF) Amorphous coating Sub-Tg annealing Free volume Wettability Electrochemical behavior

Surface modification of biomedical Mg-Ca and Mg-Zn-Ca alloys using selective laser melting: Corrosion behaviour, microhardness and biocompatibility

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2021年第6期9卷 2155-2168页

作者： Xiyu Yao Jincheng Tang yinghao zhou Andrej Atrens Matthew S.Dargusch Bjoern Wiese Thomas Ebel Ming Yan School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China The University of Queensland School of Mechanical and Mining EngineeringCentre for Advanced Materials Processing and Manufacturing(AMPAM)QLD 4072 Australia Institute of Materials Research Helmholtz-Zentrum GeesthachtGeesthacht 21502Germany

Magnesium alloys such as Mg–Ca and Mg–Zn–Ca are good orthopaedic materials;however their tendency to corrode is *** we utilize selective laser melting(SLM)to modify the surface of these Mg alloys to simultaneously improve the corrosion behaviour and *** corrosion rate decreased from 2.1±0.2 mm/y to 1.0±0.1 mm/y for the laser-processed Mg–0.6Ca,and from 1.6±0.1 mm/y to 0.7±0.2 mm/y for laser-processed Mg–0.5Zn–*** microhardness increased from 46±1 HV to 56±1 HV for Mg–0.6Ca,and from 47±3 HV to 55±3 HV for Mg–0.5Zn–*** addition,good biocompatibility remained in the laser processed Mg *** improved properties are attributed to laser-induced grain refinement,confined impurity elements,residual stress,and modified surface *** results demonstrated the potential of SLM as a surface engineering approach for developing advanced biomedical Mg alloys.

关键词： Mg alloys Selective laser melting Surface modification Corrosion behaviour Microhardness

Simultaneously improving mechanical properties and oxidation resistance of Ti-bearing high-entropy superalloys at intermediate temperature via silicon addition

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第26期157卷 30-41页

作者： Shaofei Liu Weicheng Xiao Bo Xiao Jiang Ju yinghao zhou Yilu Zhao Zengbao Jiao Junhua Luan Qian Li Jinxiong Hou Ji-jung Kai Tao Yang Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Center for Advanced Nuclear Safety and Sustainable Development City University of Hong KongHong Kong 999077China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China Hong Kong Institute for Advanced Study City University of Hong KongHong Kong 999077China

Ti-bearing high-entropy superalloys(HESAs)often suffer from severe intergranular embrittlement and terrible oxidation degradation at intermediate *** we showcase that minor Si addition can effectively mitigate the intergranular embrittlement and improve the oxidation resistance of the a(Ni_(2)Co_(2)FeCr)_(92) Ti_(4)Al_(4) HESA at 700℃ *** analysis revealed that the intergranu-lar G phase induced by 2 at%Si addition can effectively suppress the inward diffusion of oxygen along grain boundaries at 700℃,thus enhancing the tensile ductility of the alloy from∼8.3%to∼13.4%.Be-sides,the 2 at%Si addition facilitated the formation of a continuous Al_(2)O_(3) layer during oxidation,con-tributing to a remarkable reduction in the growth rate of the oxide scale to a quarter of the Si-free *** results demonstrate that Si can be a favorable alloying element to design advanced HESAs with syn-ergistically improved thermal-mechanical performance.

关键词： High-entropy superalloy Mechanical property Oxidation behavior Intermediate temperature Silicon addition

Ultra‐low cost Ti powder for selective laser melting additive manufacturing and superior mechanical properties associated

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Opto-Electronic Advances 2019年第5期2卷 10-17页

作者： Yuhang Hou Bin Liu Yong Liu yinghao zhou Tingting Song Qi zhou Gang Sha Ming Yan Department of Materials Science and Engineering and Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials Southern University of Science and Technology Shenzhen 518055 China The State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China School of Aerospace Mechanical and Manufacturing Engineering Centre for Additive Manufacturing RMIT University Melbourne VIC 3001 Australia School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China

One of the bottleneck issues for commercial scale-up of Ti additive manufacturing lies in high cost of raw material, i.e. the spherical Ti powder that is often made by gas atomization. In this study, we address this significant issue by way of powder modification & ball milling processing, which shows that it is possible to produce printable Ti powders based on ultra- low cost, originally unprintable hydrogenation-dehydrogenation (HDH) Ti powder. It is also presented that the as-printed Ti using the modified powder exhibits outstanding mechanical properties, showing a combination of excellent fracture strength (~895 MPa) and high ductility (~19.0% elongation).

关键词： selective laser melting powder modification hydrogenation-dehydrogenation (HDH) Ti ball milling additive manufacturing

舒芬太尼预防雷米芬太尼麻醉后早期疼痛的临床疗效

在线全文

学校读者我要写书评

暂无评论

中国卫生标准管理 2016年第3期7卷 180-181页

作者：周瑛昊河南省南阳市第一人民医院麻醉科 473000

目的研究舒芬太尼预防雷米芬太尼麻醉后早期疼痛的临床疗效。方法选取我院使用雷米芬太尼麻醉行胸部手术患者100例,随机分成芬太尼组和舒芬太尼组,每组患者均为50例,比较术后两组患者的疼痛治疗效果。结果舒芬太尼组患者术后1、3 h的疼... 详细信息

目的研究舒芬太尼预防雷米芬太尼麻醉后早期疼痛的临床疗效。方法选取我院使用雷米芬太尼麻醉行胸部手术患者100例,随机分成芬太尼组和舒芬太尼组,每组患者均为50例,比较术后两组患者的疼痛治疗效果。结果舒芬太尼组患者术后1、3 h的疼痛情况视觉模拟评分(VAS)均较芬太尼术后对应时间的VAS降低(P<0.05),芬太尼组与舒芬太尼组需要追加芬太尼的发生率分别为50.0%和4.0%,两组比较差异有统计学意义(P<0.05)。结论舒芬太尼对雷米芬太尼麻醉后早期疼痛具有较好的临床效果,优于芬太尼。

关键词：雷米芬太尼舒芬太尼麻醉

在线全文

学校读者我要写书评

暂无评论

基于最优控制方法的聚合物驱注入浓度优化

化工学报 2010年第8期61卷 1971-1977页

作者：张晓东张强雷阳李树荣周英毫中国石油大学(华东)信息与控制工程学院山东东营257061 中国石化中原油田采油四厂河南濮阳457003

针对聚合物驱提高原油采收率技术,建立了确定最佳注入浓度的最优控制模型。性能指标为一定时间内原油开采所获得的利润,约束条件包括非线性渗流力学偏微分方程组、积分不等式约束和控制变量的边界约束。利用二维分布参数系统最优控制的... 详细信息

针对聚合物驱提高原油采收率技术,建立了确定最佳注入浓度的最优控制模型。性能指标为一定时间内原油开采所获得的利润,约束条件包括非线性渗流力学偏微分方程组、积分不等式约束和控制变量的边界约束。利用二维分布参数系统最优控制的必要条件获得了原最优控制问题的伴随问题以及目标泛函的梯度。给出了求解该最优控制问题的一种基于梯度的数值方法,并通过研究实例表明了所提出方法的有效性。

关键词：最优控制分布参数系统聚合物驱