Anisotropy of the Vacancy Migration in Ti, Zr and Hf Hexagonal Close-Packed Metals from First Principles

2007 ◽  
pp. 75-81 ◽  
Author(s):  
Guillaume Vérité ◽  
F. Willaime ◽  
Chu Chun Fu
Keyword(s):  
First Principles ◽  
Hexagonal Close Packed ◽  
Vacancy Migration

scholarly journals Lattice Stability and Elastic Properties of Zr-Ti-X Alloys (X = Al, V) by the First Principles Study

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1317
Author(s):  
Wenxiong Duan ◽  
Xiaoping Liang ◽  
Xiangguan Yang ◽  
Yu Wang ◽  
Baifeng Luan
Keyword(s):  
Mechanical Properties ◽  
Elastic Properties ◽  
First Principles ◽  
Mass Fraction ◽  
Point Of View ◽  
Lattice Stability ◽  
Lattice Constants ◽  
Al Content ◽  
Hexagonal Close Packed ◽  
Β Phase

Based on a certain ratio of Zr and Ti atomic fractions according to Zr47Ti45Al5V3 (wt.%), the lattice constants, lattice stability, and elastic properties of Zr-Ti-X alloys (X = Al, V) in body-centered cubic (BCC) (β phase) and hexagonal close-packed (HCP) (α phase) crystal structures were studied using first-principles calculations. It is shown that Al acts as an α stabilizer for Zr-Ti-Al alloys and V can stabilize the β phase for Zr-Ti-V alloys. As the mass fraction of Al increases from 4 wt.% (Zr55Ti41Al4) to 6.8 wt.% (Zr53.2Ti40Al6.8), these alloys all have relatively good strength, hardness, and rigidity, however, their ductility deteriorated with the increasing of Al mass fraction. When the mass fraction of V in Zr-Ti-V alloys is 2.4 wt.%, Zr55.6Ti42V2.4 (wt.%) achieved the best strength, hardness, and rigidity, when the mass fraction of V increases from 0 (Zr57Ti43) to 12 wt.% (Zr50.2Ti37.8V12), their ductility improved. The changes of phase compositions and structure with Al content or V content distinctly affect mechanical properties of ternary Zr-Ti-X alloys (X = Al, V), the amount of Zr and Ti could be factors that impact the mechanical properties of the multiphase Zr47Ti45Al5V3 from the point of view of ternary Zr-Ti-Al and Zr-Ti-V compositions.

Alkaline-Earth Doped Effect on Oxygen Vacancy Migration in Monoclinic Lanthanum Germanate: First-Principles Calculation

2013 ◽  
Vol 57 (1) ◽  
pp. 1077-1083
Author(s):  
T. P. T. Linh ◽  
M. Sakaue ◽  
M. Alaydrus ◽  
T. D. K. Wungu ◽  
S. M. Aspera ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
First Principles ◽  
Alkaline Earth ◽  
First Principles Calculation ◽  
Vacancy Migration
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