scholarly journals Changes of electron density and defects distribution in binary and ternary iron alloys studied by positron annihilation

2017 ◽  
Vol 53 (3) ◽  
pp. 399-405
Author(s):  
A. Udovsky ◽  
V. Grafutin ◽  
V. Kolotushkin ◽  
V. Miloserdin ◽  
I. Evstukhina ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Electron Density ◽  
Binary Alloys ◽  
Iron Alloys ◽  
Ternary Alloys ◽  
Iron Based ◽  
And Tungsten

Properties of binary and ternary iron based alloys doped by different additions were investigated. It was shown for binary alloys containing chromium, molybdenum and tungsten were that results of doping by 0.8% molybdenum and tungsten are similar to those for the sample doped by 9%chromium. Ternary alloys containing chromium and less amounts of molybdenum, tungsten and vanadium were investigated as well. Two types of defects were observed: divacancies and cluster-like defects. It was shown that the electron density in ternary alloys is similar to that in binary alloys containing 0.8% molybdenum.

scholarly journals Use of nuclear physics methods for investigation of short-range ordering and defects in iron based simulatuing alloys

2020 ◽  
Vol 56 (1) ◽  
pp. 135-141
Author(s):  
I.A. Evstyukhina ◽  
V.P. Kolotushkin ◽  
V.Yu. Miloserdin ◽  
S.G. Rudakov ◽  
S.V. Stepanov ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Electron Density ◽  
Nuclear Physics ◽  
Short Range ◽  
Iron Alloys ◽  
Nuclear Gamma Resonance ◽  
Short Range Ordering ◽  
Iron Based

The changes of short range ordering and electron density were investigated by means of the nuclear gamma-resonance and the positron annihilation spectroscopies in model alloys containing tungsten, chromium, molybdenum, and vanadium used as dopants. The change of the short-range ordering parameter sign was detected in alloys containing vanadium. Different ordering was also observed in binary and ternary iron alloys. It was shown that dislocations were the main defects in these materials after rolling.

Diffusion of Refractory Elements in Ternary Iron Alloys

2008 ◽  
Vol 273-276 ◽  
pp. 746-751
Author(s):  
Kouji Yamashita ◽  
Tomonori Kunieda ◽  
Koutarou Takeda ◽  
Yoshinori Murata ◽  
Toshiyuki Koyama ◽  
...  
Keyword(s):  
Ternary System ◽  
Interdiffusion Coefficient ◽  
Iron Alloys ◽  
Experimental Results ◽  
Diffusion System ◽  
Ternary Alloys ◽  
Attractive Interaction ◽  
Refractory Elements ◽  
The Cross ◽  
Interdiffusion Coefficients

Interdiffusion coefficients of the refractory elements in Fe-W-Re and Fe-Cr-X (X=Mo, W) ternary alloys have been measured on the basis of the modified Boltzmann-Matano method for ternary system. Both the cross interdiffusion coefficients, Fe ReW ~D and Fe WRe ~D were negative in Fe-W-Re ternary alloys. This result indicates that attractive interaction exists between W and Re atoms in iron alloys [1]. This is consistent with our previous experimental results that Re suppresses W diffusion in Fe-15Cr alloy [1]. In addition, the value of cross interdiffusion coefficient Fe CrW ~D was positive in Fe-Cr-W diffusion system, whereas Fe MoCr ~D was negative in Fe-Cr-Mo diffusion system.

Hydrogenation Properties of Mg-Co and Its Related Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 2453-2456
Author(s):  
Y. Zhang ◽  
Y. Tsushio ◽  
Hirotoshi Enoki ◽  
Etsuo Akiba
Keyword(s):  
Binary Alloys ◽  
Lattice Parameter ◽  
Ternary Alloys ◽  
Body Centered Cubic ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Co Concentration ◽  
Bcc Structure ◽  
Co Alloys

Novel Mg-Co binary alloys with BCC (body-centered cubic) structure have been successfully synthesized by means of mechanical alloying technique. The formation of BCC structure was confirmed by X-ray diffraction and transmission electron microscopy. Mg-Co alloys were found in the range of Co concentration between 37 and 80 atomic %. All the Mg-Co alloys synthesized absorbed hydrogen below 373K. The maximum hydrogen capacity of these alloys reaches 2.7 mass %. However, desorption of hydrogen at 373 K has not been observed yet. Mg- Co-X (X = B and Ni) ternary alloys with BCC structure have also been synthesized. The lattice parameter of both alloys is lower than that of Mg-Co binary alloys, meanwhile the maximum hydrogen content of both alloys also decreased.

scholarly journals Contribution to the Study of the Relation between Microstructure and Electrochemical Behavior of Iron-Based FeCoC Ternary Alloys

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
Farida Benhalla-Haddad ◽  
Sif Eddine Amara ◽  
Abdelkader Benchettara ◽  
Kamel Taibi ◽  
Rafika Kesri
Keyword(s):  
Electrochemical Behavior ◽  
Ternary Alloys ◽  
Iron Based

scholarly journals Positron annihilation and electron densities in organic liquids

1974 ◽  
Vol 27 (5) ◽  
pp. 1125 ◽  
Author(s):  
BJ Brown
Keyword(s):  
Positron Annihilation ◽  
Electron Density ◽  
Chain Length ◽  
Atomic Number ◽  
Aliphatic Hydrocarbons ◽  
Organic Liquids ◽  
Electron Densities ◽  
Effective Electron ◽  
Molecular Electron ◽  
Aromatic Systems

The effective electron density for positron annihilation in substituted aliphatic and aromatic liquid compounds has been determined. For the aliphatic hydrocarbons the molecular electron density Ne increases linearly with an increase in chain length and is equal to the sum of the partial electron densities of the substituent methyl (Ne(CH3) = 1.18) and methylene (Ne(CH2) = 1.28) groups.The values are approximately 10% lower for aromatic systems. The partial electron densities of substituted halogen atoms increase with atomic number and are: fluorine (9.3), chlorine (10.0), bromine (14.4) and iodine (23.0). For the aliphatic alcohols the partial Ne(OH) value decreases from 1.35 in methanol to 0.86 in octanol.

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