检索结果-南通市图书馆

Endowing low fatigue for elastocaloric effect by refined hierarchical microcomposite in additive manufactured NiTiCuCo alloy

引用

International Journal of Extreme Manufacturing 2024年第4期6卷 307-322页

作者： Bo Feng Helong Liu Ying Yang Hui Shen Yang Ren Yinong Liu lishan cui Bingmin Huang Shijie Hao College of New Energy and Materials China University of PetroleumBeijing 102249People's Republic of China College of Chemical Engineering and Environment China University of PetroleumBeijing 102249People's Republic of China Department of Physics City University of Hong Kong83 Tat Chee AvenueKowloonHong Kong Special Administrative Region of ChinaPeople's Republic of China Department of Mechanical Engineering The University of Western AustraliaPerthWA 6009Australia Jiangsu Smart Advanced Material Tech Co. LtdXuzhou 221000People's Republic of China

NiTiCu-based shape memory alloys have been considered as ideal materials for solid-state refrigeration due to their superb cycling stability for elastocaloric ***,the embrittlement and deterioration caused by secondary phase and coarse grains restrict their applications,and it is still challenging since the geometric components are ***,bulk NiTiCuCo parts with excellent forming quality were fabricated by laser powder bed fusion(LPBF)*** as-fabricated alloy exhibits refined three-phases hierarchical microcomposite formed based on the rapid cooling mode of LPBF,composed of intricate dendritic Ti2Ni–NiTi composite and nano Ti2Cu embedded inside the *** configuration endows far superior elastocaloric stability compared to the as-cast *** low fatigue stems from the strong elastic coupling between the interphases with reversible martensite transformation,revealed by in-situ synchrotron high-energy x-ray *** fabrication of NiTiCuCo alloy via LPBF fills the bill of complex geometric structures for elastocaloric NiTiCu *** understanding of interphase micro-coupling could provide the guide for designing LPBF fabricated shape memory-based composites,enabling their applications for special demands on other functionalities.

关键词： NiTiCuCo shape memoryalloy microcomposite high-energyx-raydiffraction laser powderbedfusion

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ni_(50)Ti_(49)Nb_(1)合金的马氏体相变行为与超弹性

引用

功能材料 2024年第9期55卷 9172-9177页

作者：杨优奕李秋真崔立山于开元中国石油大学(北京)新能源与材料学院北京102249

通过室温拔丝与晶化退火工艺制得了不同晶粒尺寸的Ni_(50)Ti_(49)Nb_(1)和Ni_(50)Ti_(50)合金丝材。利用差示扫描量热仪(DSC)、电阻测试仪(ER)、X射线衍射仪(XRD)与透射电子显微镜(TEM)表征了样品的热致马氏体相变行为与微观组织结构,... 详细信息

通过室温拔丝与晶化退火工艺制得了不同晶粒尺寸的Ni_(50)Ti_(49)Nb_(1)和Ni_(50)Ti_(50)合金丝材。利用差示扫描量热仪(DSC)、电阻测试仪(ER)、X射线衍射仪(XRD)与透射电子显微镜(TEM)表征了样品的热致马氏体相变行为与微观组织结构,利用万能拉伸试验机测试了纳米晶样品在不同温度下的超弹特性。结果表明,两类合金的热致相变均随晶粒尺寸减小而愈发受制,当晶粒尺寸为纳米晶时,B19′相被完全抑制;低温时,纳米晶Ni_(50)Ti_(49)Nb_(1)样品R相受制更强。拉伸测试结果表明,纳米晶Ni_(50)Ti_(49)Nb_(1)样品在218~398 K温域内展现超弹性,显著优于纳米晶Ni_(50)Ti_(50)合金;前者相变临界应力以及应力滞后与温度呈非线性相关,与后者显著不同。研究结果有助于理解微量Nb掺杂对NiTi基合金相变行为与超弹性的影响规律,并为新型超弹合金设计提供思路。

关键词： NiTiNb合金相变行为超弹性 Nb掺杂

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of Predeformation on the Reverse Martensitic Transformation of TiNi Shape Memory Alloy

引用

Journal of Materials Science & Technology 2000年第6期16卷 611-614页

作者： Yanjun ZHENG lishan cui Fan ZHANG Dazhi YANG Department of Materials Science and Engineering University of Petroleum Beijing 102200 China Department of Materials Engineering Dalian University of Technology Dalian 116024 China

DSC was used to study the effects of predeformation on the reverse martensitic transformation of near-equiatomic TiNi alloy. Both the start temperature As and the finish temperature Af of the reverse transformation increased with increasing degree of predeformation, but the algebraic difference between As and Af decreased with increasing predeformation until it reached a minimum value, then remained unchanged with further deformation. Transformation heat also increased with increasing predeformation until it reached a maximum value, then decreased with further predeformation. All the phenomena above were considered to be closely related with the release of elastic strain energy during predeformation.

关键词： TiNi Effects of Predeformation on the Reverse Martensitic Transformation of TiNi Shape Memory Alloy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of Severe Plastic Deformation and Heat Treatment on Transformation Behavior of Explosively Welded Duplex TiNi-TiNi

引用

Petroleum Science 2007年第4期4卷 107-112页

作者： Li Juntao Zheng Yanjun cui lishan Department of Materials Science and Engineering China University of Petroleum Beijing 102249 China

The effects of severe plastic deformation and heat treatment on the transformation behavior of explosively welded duplex TiNi-TiNi shape memory alloys （SMAs） were investigated by differential scanning calorimeter （DSC） measurements. The explosively welded duplex TiNi-TiNi plate of 0.7 mm thickness was cold-rolled at room temperature to a 60% reduction in thickness and then annealed at different temperatures for different durations. The results showed that low temperature （623-723K） heat-treatment led to the crystallization of the amorphous region, and re-crystallization occurred in the specimens annealed at higher temperatures （over 873 K）. Research indicated that the change of martensitic transformation temperature is due to the change of internal stresses with increasing heat treatment temperature. The change of annealing time also led to a change in martensitic transformation temperature, which was associated with the precipitation and decomposition of Ti3Ni4 in TiNi-1.

关键词： TiNi explosive welding cold rolling martensitic transformation differential scanning calorimeter

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of Pseudoelasticity on Mechanical Behavior of TiNi Alloy under Dynamic Impact Loading

引用

Petroleum Science 2007年第1期4卷 86-89页

作者： Xu Renbo cui lishan Zheng Yanjun Chen Hongling Department of Materials Science and Engineering China University of Petroleum Beijing 102249 China

The mechanical behavior of TiNi alloy and Cr12MoV alloy under dynamic impact loading was investigated with a self-made impact testing system. The real-time contact force was measured with a piezoelectric force sensor and digital signal processing system during impact. Equations for predicting instantaneous velocity anti displacement were presented. The results showed that the TiNi alloy exhibited a plateau of maximum contact force with increasing impact height. At the plateau stage, TiNi alloy in the parent phase can absorb impact energy and keep the maximum contact force nearly identical due to its pseudoelasticity.

关键词： TiNi alloy mechanical behavior contact force impact energy pseudoelasticity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Properties of oxide films grown on 25Cr20Ni alloy in air-H_2O and H_2-H_2O atmospheres

引用

Petroleum Science 2014年第1期11卷 147-154页

作者： Wang Shenxiang cui lishan Wang Guoqing Zheng Yanjun Wang Hongxia Jia Jingsheng College of Science China University of Petroleum Beijing Research Institute of Chemical Industry

The oxidation kinetics,surface morphology and phase structure of oxide films grown on 25Cr20Ni alloy in air-H2O and H2-H2O atmospheres at 900 ℃ for 20 h were *** anti-coking performance and resistance to carburization of the two oxide films were compared using 25Cr20Ni alloy tubes with an inner diameter of 10 mm and a length of 850 mm in a bench scale naphtha steam pyrolysis *** oxidation kinetics followed a parabolic law in an air-H2O atmosphere and a logarithm law in a H2-H2O atmosphere in the steady-state *** oxide film grown in the air-H2O atmosphere had cracks where the elements Fe and Ni were enriched and the un-cracked area was covered with octahedral-shaped MnCr2O4 spinels and Cr1.3Fe0.7O3 oxide clusters,while the oxide film grown in the H2-H2O atmosphere was intact and completely covered with dense standing blade MnCr2O4 *** the pyrolysis tests,the anti-coking performance and resistance to carburization of the oxide film grown in the H2-H2O atmosphere were far better than that in the air-H2O *** mass of coke formed in the oxide film grown in the H2-H2O atmosphere was less than 10％ of that in the air-H2O *** Cr1.3Fe0.7O3 oxide clusters converted into Cr23C6 carbides and the cracks were filled with carbon in the oxide film grown in the air-H2O atmosphere after repeated coking and decoking tests,while the dense standing blade MnCr2O4 spinels remained unchanged in the oxide film grown in the H2-H2O *** ethylene,propylene and butadiene yields in the pyrolysis tests were almost the same for the two oxide films.

关键词： 25Cr20Ni alloy air-H2O H2-H2O oxide film anti-coking resistance to carburization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Large elastic strains and ductile necking of W nanowires embedded in TiNi matrix

引用

Journal of Materials Science & Technology 2021年第1期60卷 56-60页

作者： Daqiang Jiang Zhenghao Jia Hong Yang Yinong Liu Fangfeng Liu Xiaohua Jiang Yang Ren lishan cui Department of Materials Science and Engineering China University of Petroleum-BeijingBeijingChangping 102249China Department of Mechanical Engineering The University of Western AustraliaPerthWA 6009Australia Beijing Key Laboratory of Failure Corrosionand Protection of Oil/Gas FacilitiesChina University of Petroleum BeijingBeijing 102249China X-ray Science Division Argonne National LaboratoryLemontIL 60439USA

The deformation behaviors of W nanowires embedded in a TiNi matrix were investigated by means of in-situ synchrotron high energy X-ray diffraction(HEXRD) and in-situ transmission electron microscopy(TEM) analysis during tensile *** HEXRD measurement indicated that the W nanowires exhibited an average lattice strain of about 1.50 %,whereas the TEM examination revealed a local elastic strain of about 4.59 % in areas adjacent to the TiNi matrix where stress-induced martensitic transfo rmation *** strain corresponds to a stress of ~15 GPa for the W *** addition,in areas adjacent to the TiNi matrix where plastic deformation and cracking were generated,the W nanowire showed significant ductile necking with ~80 % reduction in cross-section *** ductile necking of W nanowire is attributed to the lack of protection from the stress-induced martensitic transformation of the TiNi matrix.

关键词： Tungsten Nanowire In-situ TEM Elastic strain

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Oxidation of Fe-Cr-Ni Alloys in a Low Oxygen Partial Pressure Atmosphere to Mitigate Coke Formation

引用

中国炼油与石油化工:英文版 2023年第3期25卷 49-59页

作者： Wang Hongxia Wang Guoqing Zhang Lijun Wang Shenxiang Jia Jingsheng cui lishan Sinopec(Beijing)Research Institute of Chemical Industry Co. Ltd.Beijing 100013China Departments of Materials Science and Engineering China University of PetroleumBeijing 102249China

Anti-coking oxide films were prepared on a 25Cr35Ni and 35Cr45Ni alloy surface under the low oxygen partialpressure atmosphere of a H2-H2O mixture. The composition and phase structure of the oxide films were analyzed by energydispersive spectroscopy (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The anti-cokingperformance of a mini tube made of a HP40 (25Cr35Ni) alloy was evaluated on a bench scale pyrolysis and coking test *** results showed that the surface Fe and Ni content decreased after the oxidation of the two alloys in a low oxygen partialpressure atmosphere. The oxide films were mainly composed of MnCr_(2)O_(4) and Cr_(2)O_(3). The average mass of coke in the minitube with oxide film decreased by 87% relative to that of a tube without an oxide film when the cracking temperature was 900℃. The ethylene, propylene, and butadiene yields in the pyrolysis tests were almost the same for the mini tubes withand without an oxide film. The oxide film on the alloy surface effectively inhibited catalytic filamentous coke *** industrial test showed that the run length of the cracking furnace with the in-situ coating technology was significantlyextended.

关键词： Fe-Cr-Ni alloy low oxygen partial pressure oxide film anti-coking ethylene cracking furnace in-situ coating

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Synthesis of TiNi and Composite Particles in Molten Salts

引用

Petroleum Science 2005年第3期2卷 37-39页

作者： Yang Ruisong cui lishan Zheng Yanjun Department of Materials Science and Engineering China University of Petroleum ChinaBeijing 102249

A novel process for synthesizing TiNi and TiNi/TiC particles, called the high-temperature salt-melting method, is discussed in this paper. So far as this method is concerned, the molten salts are a reaction medium that does not take part in the chemical reaction but can be easily dissolved by water washing. With this method, TiNi shape memory alloy and TiNi/TiC composite particles were prepared in molten salts at 680-850℃. TiNi particles, ranging from 100 nm to several microns in diameter, are obtained and the reverse martensitic transformation is confirmed in these particles by the differential scanning calorimetry （DSC）. The reaction temperature and the holding time have no significant influence on the particle size, morphology or the reverse martensitic transformation characteristics. In the molten salts, the released heat of the chemical reaction causes the local temperature to rise quickly, which is the key to obtaining the desired particulate composite.

关键词： TiC particles TiNi particles molten salts martensitic transformation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Selective laser melting of NiTi alloy with superior tensile property and shape memory effect

引用

Journal of Materials Science & Technology 2019年第10期35卷 2238-2242页

作者： Zhiwei Xiong Zhonghan Li Zhen Sun Shijie Hao Ying Yang Meng Li Changhui Song Ping Qiu lishan cui State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China Qian Xuesen Laboratory of Space Technology China Academy of Space TechnologyBeijing100094China School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou510641China

It is a challenge to develop complex-shaped Ni Ti shape memory alloy parts by traditional processing methods, due to the poor machinability of Ni Ti alloy. It is reported that selective laser melting(SLM) of additive manufacturing could overcome this problem. However, the reported SLM-produced Ni Ti exhibits poor tensile ductility due to the inner defects and adverse unidirectional columnar grains from SLM process. In this work, the defect-less SLM-Ni Ti with nondirective columnar grains was fabricated by optimizing the intraformational laser scanning length and interformational laser scanning direction. The obtained lath-shaped SLM-Ni Ti sample exhibits tensile strain of 15.6%, more than twice of the reported maximum result(7%). Besides, the SLM-Ni Ti part with complex geometry displays a shape memory recovery of 99% under compressive deformation of 50%.

关键词： NiTi shape memory alloy Selective laser melting Tensile ductility Shape memory effect

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：