Approach to the Theoretical Strength of Ti–Ni–Cu Alloy Nanocrystals by Grain Boundary Design

2015 ◽  
Vol 31 (1) ◽  
pp. 91-96 ◽  
Author(s):  
Alexandr M. Glezer ◽  
Nadezhda A. Shurygina ◽  
Elena N. Blinova ◽  
Inga E. Permyakova ◽  
Sergey A. Firstov
Keyword(s):  
Grain Boundary ◽  
Theoretical Strength ◽  
Alloy Nanocrystals ◽  
Cu Alloy

On the Shape of Field-Ion Emitters

1976 ◽  
Vol 34 ◽  
pp. 520-521
Author(s):  
H.C. Eaton ◽  
B.N. Ranganathan ◽  
T.W. Burwinkle ◽  
R. J. Bayuzick ◽  
J.J. Hren
Keyword(s):  
Grain Boundary ◽  
Spherical Shape ◽  
Theoretical Strength ◽  
Evaporation Process ◽  
Field Evaporation ◽  
Geometric Information ◽  
Field Ion Microscopy ◽  
Considerable Error ◽  
True Shape ◽  
Ion Microscopy

The shape of the emitter is of cardinal importance to field-ion microscopy. First, the field evaporation process itself is closely related to the initial tip shape. Secondly, the imaging stress, which is near the theoretical strength of the material and intrinsic to the imaging process, cannot be characterized without knowledge of the emitter shape. Finally, the problem of obtaining quantitative geometric information from the micrograph cannot be solved without knowing the shape. Previously published grain-boundary topographies were obtained employing an assumption of a spherical shape (1). The present investigation shows that the true shape deviates as much as 100 Å from sphericity and boundary reconstructions contain considerable error as a result.Our present procedures for obtaining tip shape may be summarized as follows. An empirical projection, D=f(θ), is obtained by digitizing the positions of poles on a field-ion micrograph.

Grain Boundary Precipitate Density as a Function of Time and Misorientation in an Al-5 WT% Cu Alloy

1993 ◽  
Vol 319 ◽  
Author(s):  
M. A. Cantrell ◽  
G. J. Shiflet
Keyword(s):  
Heat Treatment ◽  
Grain Boundary ◽  
Treatment Time ◽  
Boundary Plane ◽  
Heat Treatment Time ◽  
Boundary Structure ◽  
Plane Orientation ◽  
Cu Alloy ◽  
Grain Boundary Plane ◽  
Precipitate Density

AbstractThe variation of θ (CuAI2) precipitate density as a function of heat treatment time and grain boundary misorientation was investigated in an Al-5 wt % Cu alloy. In this study, precipitate densities have been quantitatively linked to grain boundary structure. It was found that, for a given heat treatment time, the precipitate density varied in a reproducible manner (108 to 1010 ppts/cm2) as a function of misorientation between the grains (20 to 60 degrees). Additionally, misorientation was found to be the most important factor governing the precipitate density at a given grain boundary. The grain boundary plane orientation played a secondary role in determining the precipitate density. Bollmann O-lattice modeling allows comparison of the relative effects of grain boundary plane orientation relative to the misorientation between grains.

A Comparative Study on Electromigration Failure Mechanism Between Near-Bamboo and Bamboo Al(Cu) Two-Level Structure

1995 ◽  
Vol 391 ◽  
Author(s):  
P.-H. Wang ◽  
C. Lee ◽  
D. jawarani ◽  
H. kawasaki ◽  
P. S. ho
Keyword(s):  
Grain Boundary ◽  
Failure Mechanism ◽  
Boundary Diffusion ◽  
Level Structure ◽  
Interface Diffusion ◽  
Level Lines ◽  
Cu Alloy ◽  
Grain Distribution ◽  
Bamboo Structure ◽  
Reliability Issue

AbstractAs the interconnect line width reduces to the sub-micron range, the grain distribution of Al(Cu) alloy lines reaches a bamboo structure. Understanding of the electromigration resistance of near-bamboo and bamboo structures is essential to the sub-micron reliability issue. In this study, the mass transport and failure mechanism of 1 μm wide Al(1%Cu) two-level lines with near-bamboo and bamboo structures were investigated by a drift velocity technique [1]. Our results show that interfacial (A10X/A1 interface) diffusion coupled with grain boundary diffusion determines the failure mechanism of bamboo lines.

Zinc-doping enhanced cadmium sulfide electrochemiluminescence behavior based on Au-Cu alloy nanocrystals quenching for insulin detection

2017 ◽  
Vol 97 ◽  
pp. 115-121 ◽  
Author(s):  
Wenjuan Zhu ◽  
Chao Wang ◽  
Xiaojian Li ◽  
Malik Saddam Khan ◽  
Xu Sun ◽  
...  
Keyword(s):  
Cadmium Sulfide ◽  
Alloy Nanocrystals ◽  
Cu Alloy ◽  
Zinc Doping ◽  
Behavior Based

Improvement of Stress Corrosion Cracking (SCC) Resistance of a 7150 Al-Zn-Mg-Cu Alloy by Retrogression and Reageing (RRA) Treatment

2014 ◽  
Vol 984-985 ◽  
pp. 529-535 ◽  
Author(s):  
Prasanta Kumar Rout ◽  
M.M. Ghosh ◽  
K.S. Ghosh
Keyword(s):  
Electron Microscope ◽  
Grain Boundary ◽  
Transmission Electron Microscope ◽  
Stress Corrosion Cracking ◽  
Peak Hardness ◽  
Slow Strain Rate Test ◽  
Cu Alloy ◽  
Transmission Electron ◽  
Crack Morphology ◽  
Rate Test

A 7150 Al-Zn-Mg-Cu alloy is artificially aged at 120 oC for varying time. The peak hardness (T6 temper) is obtained at about 24 h at that temperature. Further, the T6 temper is subjected to retrogression and reageing (RRA) treatment. Slow strain rate test (SSRT) has been carried out on the T6 and RRA tempers. SSRT results indicated that the RRA temper have higher resistance to SCC compared to that of T6 temper. SCC behaviour of the alloy tempers have been explained with the help of microstructural features studied by transmission electron microscope (TEM). The large, discrete and discontinuous grain boundary precipitates observed in the microstructure of the RRA temper are believed to be the responsible factor for achieving higher SCC resistance. Further, SEM fractographs and crack morphology have also been analyzed to evaluate the SCC behaviour of the alloy tempers.

Effect of Zinc Content on the Ageing Behavior of Al-Zn-Mg-Cu-Li Alloys

2008 ◽  
Vol 575-578 ◽  
pp. 1093-1096 ◽  
Author(s):  
Zhong Kui Zhao ◽  
Qing Zhou Sun ◽  
Pu Qing Zhang ◽  
Chang Long Li ◽  
Xue Jiu Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Grain Boundary ◽  
Vickers Hardness ◽  
Zinc Content ◽  
Alloying Elements ◽  
Ageing Process ◽  
Cu Alloy ◽  
Transmission Electron ◽  
Second Phases

In this paper, Al-5.6Zn-2.8Mg-1.6Cu-0.24Cr-1.1Li, Al-8.0Zn-2.4Mg-2.4Cu-1.1Li-0.18Zr and Al-11.8Zn-2.9Mg-2.8Cu-1.1Li-0.24Zr (in wt%) alloys were artificially aged at 80,100,120,140 and 160°C for different time, respectively. The ageing process, microstructure and hardness of different alloys are investigated by Vickers hardness and transmission electron microscopy (TEM). With the increment of zinc content, addition of Li to Al-Zn-Mg-Cu alloy containing high alloying elements has little effect on the nucleation of precipitates, but the growth of precipitates has been inhibited. Very fine precipitates with high density are formed during ageing due to the existence of high alloying elements, which result in highly strengthening alloy. As the alloying content is too high to exceed the solution saturation of matrix, coarse second phases are formed in grain boundary.

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