scholarly journals Understanding the effects of rapid solidification and ternary alloying additions on chemical order-disorder transformation in FeNi₃

2015 ◽  
Author(s):  
Mahboobeh Rezaeeyazdi
Keyword(s):  
Rapid Solidification ◽  
Chemical Order ◽  
Alloying Additions ◽  
Ternary Alloying

Site Occupancy Determination by ALCHEMI of Nb and Cr in γ-TiAl and Their Effects on the a to γ Massive Phase Transformation

1999 ◽  
Vol 589 ◽  
Author(s):  
T.M. Miller ◽  
L. Wang ◽  
W.H. Hofmeister ◽  
J.E. Wittig ◽  
I.M. Anderson
Keyword(s):  
Solid State ◽  
Rapid Solidification ◽  
Titanium Aluminides ◽  
Site Occupancy ◽  
Solidification Structure ◽  
Two Phase ◽  
Alloying Additions ◽  
Massive Phase ◽  
Ternary Alloying ◽  
Solid State Cooling

AbstractAtom location by channeling enhanced microanalysis (ALCHEMI) has been used to characterize the site distributions of Nb and Cr alloying additions in the L10-ordered γ phase of ternary titanium aluminides. Two alloys, Ti50Al48Cr2 and Ti50A148Nb2, were processed by furnace cooling from 1300°C (within the α-γ two phase field) as well as by rapid solidification using twin-anvil splat quenching of electromagnetically levitated and undercooled samples. ALCHEMI studies of furnace cooled samples yield results generally consistent with those in the published literature. Nb alloying additions are found to partition exclusively to the ‘Ti’ sublattice, while Cr alloying additions exhibit an ‘Al‘ sublattice preference. However, a higher degree of disorder can be achieved with rapid solidification and high solid state cooling rates (105-106 K/s). Significant distribution of the ternary elements between the ‘Ti’ and ‘Al‘ sublattices has been measured in the splat quenched samples, with up to 12% of the Nb atoms occupying the ‘Al‘ sublattice and the fraction of Cr atoms on the ‘Ti’ sublattice doubling to ∼30%. Rapid solidification of TiAl produces an equiaxed hexagonal α phase solidification structure that transforms in a massive fashion to the tetragonal γ phase. Although the amount of massively transformed γ is dependent upon the solid state cooling rate, ternary alloying additions can more strongly influence the transformation kinetics. The Nb-modified alloy exhibits significant amounts of the massively tranformed γ, similar to the Ti52Al48 binary alloy, whereas little massively transformed γ is observed in the Cr-modified alloy. These results can be correlated with the relative atomic size, lattice distortion, and sublattice site occupancy of Nb and Cr in the L10 unit cell.

The A1 to L10 transformation in FePt films with ternary alloying additions of Mg, V, Mn, and B

2011 ◽  
Vol 109 (7) ◽  
pp. 07B739 ◽  
Author(s):  
B. Wang ◽  
K. Barmak ◽  
T. J. Klemmer
Keyword(s):  
Alloying Additions ◽  
Ternary Alloying

scholarly journals THE EFFECTS OF TERNARY ALLOYING ADDITIONS ON THE CORROSION RESISTANCE OF EPSILON-PHASE URANIUM-ZIRCONIUM ALLOYS

1956 ◽  
Author(s):  
J.E. Reynolds ◽  
W.E. Berry ◽  
H.R. Ogden ◽  
R.S. Peoples ◽  
R.I. Jaffee
Keyword(s):  
Corrosion Resistance ◽  
Zirconium Alloys ◽  
Alloying Additions ◽  
Ternary Alloying

Site preference of ternary alloying additions to AuTi

2006 ◽  
Vol 425 (1-2) ◽  
pp. 239-244 ◽  
Author(s):  
Guillermo Bozzolo ◽  
Hugo O. Mosca ◽  
Ronald D. Noebe
Keyword(s):  
Site Preference ◽  
Alloying Additions ◽  
Ternary Alloying
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