The influence of alloying elements on the corrosion behaviour of single-phase alloys

1965 ◽  
Vol 5 (5) ◽  
pp. 377-382 ◽  
Author(s):  
M. Pražák ◽  
K. Barton
Keyword(s):  
Single Phase ◽  
Corrosion Behaviour ◽  
Alloying Elements

Effects of Alloying Elements on Elastic Modulus of Ti-Nb-Ta-Zr System Alloy for Biomedical Applications

2004 ◽  
Vol 449-452 ◽  
pp. 1269-1272 ◽  
Author(s):  
Nobuhito Sakaguchi ◽  
Niinomi Mitsuo ◽  
Toshikazu Akahori ◽  
Takashi Saito ◽  
Tadahiko Furuta
Keyword(s):  
Biomedical Applications ◽  
Elastic Moduli ◽  
Single Phase ◽  
Alloy Composition ◽  
Alloying Elements ◽  
System Alloy ◽  
Phase Precipitation ◽  
Alloying Element ◽  
Quaternary Alloys ◽  
Nb Content

Effects of alloying elements on elastic moduli (Young’s moduli) of Ti-Nb-Ta-Zr system alloys for biomedical applications were investigated. In this case, Ti-30Nb-10Ta-5Zr which is the simplified chemical compositional alloy of Ti-29Nb-13Ta-4.6Zr for biomedical applications has been selected as the basic alloy composition. Each alloying element content of Ti-Nb-Ta-Zr quaternary alloys was varied independently. Nb content was varied from 0 through 40 mass % by eight levels. Ta content was varied from 0 through 20 mass % by five levels. Zr content was varied from 0 through 10 mass % by five levels. Every alloy was fabricated by powder metallurgy processing, followed by forging. Ti-30Nb-10Ta-5Zr with single phase, which is a basic alloy composition, shows the lowest Young’s modulus. phase precipitation in phase has much greater effect on increasing Young’s modulus than phase precipitation in Ti-Nb-Ta-Zr quaternary alloys.

scholarly journals The Effect of Powder Particle Biencapsulation with Ni-P Layer on Local Corrosion of Bonded Nd-(Fe,Co)-B Magnetic Material

2015 ◽  
Vol 60 (1) ◽  
pp. 153-157 ◽  
Author(s):  
D. Klimecka-Tatar ◽  
G. Pawłowska ◽  
M. Sozańska
Keyword(s):  
Magnetic Material ◽  
Epoxy Resin ◽  
Magnetic Materials ◽  
Powder Particle ◽  
Single Phase ◽  
Corrosion Behaviour ◽  
Powder Surface ◽  
Powder Particles ◽  
Individual Particles ◽  
Thermosetting Epoxy

Abstract Effect of the Nd-(Fe,Co)-B powder particle biencapsulation with Ni-P layer on bonded magnetic materials corrosion behaviour has been investigated. Bonded magnets were prepared from single-phase, nanocrystalline magnetic Nd11Fe77Co5B6 powder. Powder particles before consolidation were preliminary etched and then coated with bilayer (powder biencapsulation). The powder surface was coated as a first with autocatalytic applied Ni-P layer during 5, 15 and 30 minutes in Ni(II) containing bath and the second layer was thermosetting epoxy-resin. Impact of the used biencapsulation process was rated on the basis of polarization curves recorded in phosphate environment with addition of chloric ions. It has been established that the used biencapsulation method satisfactorily isolate individual particles of the powder and consequently, significantly inhibits corrosion processes of the final material, especially in passivating environment containing Cl-.

Hot corrosion behaviour of single-phase platinum-modified aluminide coatings: Effect of Pt content and pre-oxidation

2017 ◽  
Vol 127 ◽  
pp. 82-90 ◽  
Author(s):  
Y.F. Yang ◽  
C.Y. Jiang ◽  
Z.Y. Zhang ◽  
Z.B. Bao ◽  
M.H. Chen ◽  
...  
Keyword(s):  
Hot Corrosion ◽  
Single Phase ◽  
Corrosion Behaviour ◽  
Aluminide Coatings

Effects of Alloying Elements on the Temperature Dependence of Yield Stress in L12-Co3(Al,W)

2015 ◽  
Vol 1760 ◽  
Author(s):  
Zhenghao M. T. Chin ◽  
Norihiko L. Okamoto ◽  
Haruyuki Inui
Keyword(s):  
High Temperature ◽  
Temperature Dependence ◽  
Yield Stress ◽  
Room Temperature ◽  
Single Phase ◽  
Alloying Elements ◽  
High Temperature Strength ◽  
Positive Temperature ◽  
Compression Tests ◽  
Polycrystalline Alloys

ABSTRACTThe effects of alloying elements (Ni/Ta) on the temperature dependence of yield stress in Co3(Al,W) with the L12 structure have been investigated through compression tests of nearly single-phase polycrystalline alloys in the temperature range between room temperature to 1,473K. Compared with a ternary Co3(Al,W), a Ni/Ta-added Co3(Al,W) alloy exhibits a higher γ΄ solvus temperature and lower onset temperature of the yield stress anomaly (positive temperature dependence of yield stress), suggesting that the CSF energy is increased by Ni/Ta addition. As a consequence, the high-temperature strength in Co3(Al,W) is considerably enhanced.

scholarly journals Roles of Alloying Elements on the Passivity of W-xCr-yNi Alloys in Aggressive Environments

2014 ◽  
Vol 14 (2) ◽  
pp. 73-80
Author(s):  
PL Kharel ◽  
SP Sah ◽  
J Bhattarai
Keyword(s):  
Solid Solution ◽  
Corrosion Resistance ◽  
Synergistic Effect ◽  
Single Phase ◽  
Alloying Elements ◽  
Anodic Current ◽  
Ni Alloys ◽  
Current Densities ◽  
Sputter Deposited

The role of alloying elements on the passivity of the sputter−deposited amorphous or nanocrystalline W-xCr-yNi alloys in 12 M HCl, 0.5 M NaCl and 1 M NaOH solutions open to air at 30°C was studied by corrosion tests and electrochemical measurements. All the examined sputter-deposited W-(42-75)Cr-(4-15)Ni alloys, which are composed of either amorphous or nanocrystalline single phase solid solution, showed higher corrosion resistance than those of alloying elements (i.e. tungsten, chromium and nickel) in 12 M HCl, 0.5 M NaCl and 1 M NaOH solutions. All the alloys used in this study showed higher corrosion resistance than those of the alloying elements in the aggressive environments. Anodic current densities of the alloys decreased with increasing chromium contents and became lower than that of chromium. Transpassive dissolution of chromium was significantly enhanced by the simultaneous additions of tungsten, chromium and nickel in aggressive environments of 12 M HCl, 0.5 M NaCl and 1 M NaOH. Hence the synergistic effect of chromium addition in enhancing the corrosion resistance of the W-xCr-yNi alloys was clearly observed from the present study.DOI: http://dx.doi.org/10.3126/njst.v14i2.10418   Nepal Journal of Science and Technology Vol. 14, No. 2 (2013) 65-72

scholarly journals Electrochemical Hydrogenation and Corrosion Behaviour of LaNi5-xGex (x = 0.3 and 0.6) Alloys

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5285
Author(s):  
Krystyna Giza ◽  
Edyta Owczarek
Keyword(s):  
Current Density ◽  
Single Phase ◽  
Corrosion Behaviour ◽  
Point Of View ◽  
Hydrogen Energy ◽  
Discharge Current Density ◽  
Germanium Alloy ◽  
The One ◽  
A Charge

The capacitive and kinetic parameters of hydride electrodes obtained on the basis of single-phase LaNi5-xGex alloys (x = 0.3 and 0.6) were related to their corrosive properties. The content of the article is important from the point of view of the improvement of LaNi5 type materials for hydrogen energy storage used as anodes in NiMH batteries. The presence of large amounts of germanium (10% at.) in the alloy results in much less surface degradation compared to the low-germanium alloy (5% at.), which, on the one hand, leads to an improvement in the resistance of the high-germanium LaNi4.4Ge0.6 alloy to long-term cycling, but on the other hand, contributes to lower hydrogen absorption by this material. The maximum discharge capacity of 293 mAh g−1 was obtained for the low-germanium alloy using a charge/discharge current density of 185 mA g−1. The studied electrode also shows a lower tendency to self-discharge and a clearly higher exchange current density.

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