中国科学院机构知识库网格系统: 检索

Reheat cracking in Ti2AlNb alloy resistance spot weldments 期刊论文 OAI收割
Intermetallics, 2013, 卷号: 38, 页码: 63-69
D. T. Cai; J. C. Chen; X. F. Mao; C. Y. Hao

收藏 | 浏览/下载：15/0 | 提交时间：2013/12/24

Titanium aluminides Welding Mechanical properties at high temperatures Electron microscopy heat-affected zones al-nb system mechanical-properties orthorhombic alloys titanium aluminide ti3al-nb alloy yield stress microstructure phase transformations based on Ti3Al transmission

High-temperature fatigue property of Ti46Al8Nb alloy with the fully lamellar microstructure 期刊论文 OAI收割
Intermetallics, 2012, 卷号: 24, 页码: 41469
Y. Zhou; J. Q. Wang; B. Zhang; W. Ke; E. H. Han

收藏 | 浏览/下载：52/0 | 提交时间：2013/02/05

Titanium aluminides based on TiAl Mechanical properties at high temperatures Fracture modes Microstructure Automotive uses including engines gamma-titanium aluminide low-cycle fatigue tial automotive valves mechanical-properties thermal-stability crack propagation high nb fracture behavior intermetallics

Preliminary investigation on strong magnetic field treated NiAl-Cr(Mo)-Hf near eutectic alloy 期刊论文 OAI收割
Intermetallics, 2011, 卷号: 19, 期号: 2, 页码: 143-148
L. Y. Sheng; J. T. Guo; W. L. Ren; Z. X. Zhang; Z. M. Ren; H. Q. Ye

收藏 | 浏览/下载：15/0 | 提交时间：2012/04/13

Nickel aluminides based on NiAl Mechanical properties at ambient temperature Mechanical properties at high temperatures Heat treatment Microstructure mechanical-properties nial-cr microstructure

Effect of withdrawal rate on microstructure and mechanical properties of a directionally solidified NiAl-based hypoeutectic alloy doped with trace Hf and Ho 期刊论文 OAI收割
Intermetallics, 2011, 卷号: 19, 期号: 2, 页码: 206-211
J. T. Guo; Y. Xie; L. Y. Sheng; L. Z. Zhou; Y. C. Liang

收藏 | 浏览/下载：18/0 | 提交时间：2012/04/13

Nickel aluminides based on NiAl Mechanical properties at ambient temperature Mechanical properties at high temperatures Crystal growth Microstructure temperature fracture-toughness rod-plate transition in-situ composites eutectic alloy compressive properties deformation strength cr systems mo

Effect of growth rate on the tensile properties of DS NiAl/Cr(Mo) eutectic alloy produced by liquid metal cooling technique 期刊论文 OAI收割
Intermetallics, 2010, 卷号: 18, 期号: 3, 页码: 319-323
Y. C. Liang; J. T. Guo; Y. Xie; L. Y. Sheng; L. Z. Zhou; Z. Q. Hu

收藏 | 浏览/下载：14/0 | 提交时间：2012/04/13

Nickel aluminides based on NiAl Mechanical properties at ambient temperature Mechanical properties at high temperatures nial-cr mechanical-properties microstructure

Effect of Au addition on the microstructure and mechanical properties of NiAl intermetallic compound 期刊论文 OAI收割
Intermetallics, 2010, 卷号: 18, 期号: 4, 页码: 740-744
L. Y. Sheng; W. Zhang; J. T. Guo; F. Yang; Y. C. Liang; H. Q. Ye

收藏 | 浏览/下载：13/0 | 提交时间：2012/04/13

Nickel aluminides based on NiAl Au microalloying Mechanical properties at ambient temperature and high temperatures Microstructure temperature compressive properties eutectic alloy

Microstructure evolution and mechanical properties' improvement of NiAl-Cr(Mo)-Hf eutectic alloy during suction casting and subsequent HIP treatment 期刊论文 OAI收割
Intermetallics, 2009, 卷号: 17, 期号: 12, 页码: 1115-1119
L. Y. Sheng; W. Zhang; J. T. Guo; L. Z. Zhou; H. Q. Ye

收藏 | 浏览/下载：17/0 | 提交时间：2012/04/13

Nickel aluminides based on NiAl Mechanical properties at ambient temperature Mechanical properties at high temperatures Rapid solidification processing Hot isostatic pressing compressive properties deformation

Design of dual-FOV refractive/diffractive LWIR optical system (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Advanced Optical Manufacturing Technologies, July 8, 2007 - July 12, 2007, Chengdu, China
作者: Wang L.-J.; Zhang J.-P.; Wang L.-J.; Zhang X.; Zhang X.

收藏 | 浏览/下载：19/0 | 提交时间：2013/03/25

An infrared-optical zoom system using binary element is proposed in this paper. The two main advantages of the zoom system introducing here are: bigger F-number and lower cost. The primary optical properties are: F/#=1 Second Others zoom ratio =1:4 binary element is used to correct the chromatical aberration by taking the advantage of negative dispersion characteristics and the cost of the system is lower than that of conventional ones with Zinc Selenide (Znse) material at the same level. In the binary element is rotational symmetric with one step which is easy to fabricate in order to balance 5th spherical aberration and dual field are 26.6 and 5.6respectively. Wider field of view is used for search and the smaller one is used for imaging details. This system uses un-cooled infrared detector with 320240 pixels and 45m pixel size. The F-number matches the sensitivity range of the detector array. Three aspects are considered during design process to make the system more satisfactory and more achievable. First 5th coma aberration and 5th astigmatic aberration the manner of zoom is accomplished by exchanging tow lenses into the smaller field of view system layout. The lens exchange manner faces the requirement of simple system structure and good image quality in both focal points. It can also make the system more feasible in the alignment process than mechanical-zooming manner and optical-zooming manner high-order asphere surfaces with 2th order to 10 th order are also hired in the system. Asphere surface is useful in compressing the system and improving optical system transmittance. This kind asphere surface is on industrial level featuring low cost and easy to fabricate. It is shown that good image quality can achieved by implementing five Germanium lenses and the transmittance of system is 72%. All aberrations are diffraction-limited both spherical aberration and astigmatic aberration are corrected. When the field of view(FOV) is 26.6 and the focal length is 152mm MTF at Nyquist frequency(11lp/mm) is great than 0.7. The spherical aberration is -0.0073. The coma aberration is 0.0978 and the astigmatic aberration is -0.013. When the field of view(FOV) is 5.6 and the focal length is 38mm MTF at Nyquist frequency is great than 0.8 with spherical aberration -0.0046 the coma aberration 0.055 and astigmatic aberration 0.034.

Fabrication and electron emission of carbon microtubes (EI CONFERENCE) 会议论文 OAI收割
Technical Digest of the 18th International Vacuum Nanoelectronics Conference, IVNC 2005, July 10, 2005 - July 14, 2005, Oxford, United kingdom
作者: Liu L.; Liu L.; Wang W.; Wang W.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

Carbon nanotubes have been attracting attention because of their unique physical properties and their application potential for field emission cathode. Carbon nanotubes possess the following properties favorable for field emission material such as a high aspect ratio and sharp tip high chemical stability high mechanical strength stable at high temperature. Some research works on carbon nanotubes field emitter and field emission display have been reported. Here a kind of carbon microtubes and its field emission properties are introduced. They have some different properties with carbon nanotubes and the density is lower than carbon nanotubes bundles. These carbon microtubes are directly synthesized by liquidoid epitaxy method on silicon substrates at low temperature. The field emission properties of carbon microtubes are reported too. Carbon microtubes film is synthesized in liquid by electrolysis. The graphite plate is as anode and n-silicon substrate with resistivity of 4-8 cm is as cathode. The electrolysis current is about 5-8mA/cm2 and applied voltage is 800-1500V. Temperatures of the methanol base solution is maintained at 60C in process of deposition of carbon microtubes. Carbon microtubes film is observed by scanning electron microscopy(SEM) as shown in fig.1(a b). The wall's thickness of carbon microtube is about 60nm. The diameter of carbon microtube is about 0.8 m. Raman spectrum of carbon microtubes film shows the two peaks at 1342and 1560cm-1. The field emission properties of carbon microtubes are measured in high vacuum chamber(10-5Pa). The emission area of carbon microtubes is 0.5cm 0.5cm. The threshold of field emission of the carbon microtubes film is about 3.6V/ m. Field emission property of carbon microtubes film is shown in fig.2. Another when the electric field between anode and cathode is 10V/ m the electric field distribution on single carbon microtube is also given after calculation according to electric field theory. Fig 3 shows that electric field distribution vertical section on the of single carbon microtube top with 2 m of highness. These results may help us to understand field emission properties of carbon microtubes. According to research results it is found that liquidoid synthesis is simple method to produce carbon microtubes cold cathode material and the carbon microtubes have better field emission properties. 2005 IEEE.

Large tensile elongation behavior of extruded NiAl polycrystals with stoichiometric composition 期刊论文 OAI收割
Intermetallics, 2005, 卷号: 13, 期号: 3-4, 页码: 257-261
J. T. Guo; X. H. Du

收藏 | 浏览/下载：9/0 | 提交时间：2012/04/14

nickel aluminides based on NiAl mechanical properties at high temperatures casting extrusion microstructure intermetallic alloys single-crystals strain rate deformation superplasticity