A comparative study of helium atom diffusion via an interstitial mechanism in nickel and palladium

2006 ◽  
Vol 243 (3) ◽  
pp. 579-583 ◽  
Author(s):  
Jixing Xia ◽  
Wangyu Hu ◽  
Jianyu Yang ◽  
Bingyun Ao ◽  
Xiaolin Wang
2014 ◽  
Vol 630 ◽  
pp. 208-215 ◽  
Author(s):  
Patrick Kraus ◽  
Michael Mayrhofer-Reinhartshuber ◽  
Christian Gösweiner ◽  
Florian Apolloner ◽  
Salvador Miret-Artés ◽  
...  

2021 ◽  
Vol 392 ◽  
pp. 127136
Author(s):  
Ibraheem Nasser ◽  
César Martinez-Flores ◽  
Mostafa Zeama ◽  
Rubicelia Vargas ◽  
Jorge Garza

2020 ◽  
Author(s):  
Bruno Oliveira Ferreira de Souza ◽  
Éve‐Marie Frigon ◽  
Robert Tremblay‐Laliberté ◽  
Christian Casanova ◽  
Denis Boire

Author(s):  
G.J.C. Carpenter

In zirconium-hydrogen alloys, rapid cooling from an elevated temperature causes precipitation of the face-centred tetragonal (fct) phase, γZrH, in the form of needles, parallel to the close-packed <1120>zr directions (1). With low hydrogen concentrations, the hydride solvus is sufficiently low that zirconium atom diffusion cannot occur. For example, with 6 μg/g hydrogen, the solvus temperature is approximately 370 K (2), at which only the hydrogen diffuses readily. Shears are therefore necessary to produce the crystallographic transformation from hexagonal close-packed (hep) zirconium to fct hydride.The simplest mechanism for the transformation is the passage of Shockley partial dislocations having Burgers vectors (b) of the type 1/3<0110> on every second (0001)Zr plane. If the partial dislocations are in the form of loops with the same b, the crosssection of a hydride precipitate will be as shown in fig.1. A consequence of this type of transformation is that a cumulative shear, S, is produced that leads to a strain field in the surrounding zirconium matrix, as illustrated in fig.2a.


2001 ◽  
Vol 268 (6) ◽  
pp. 1739-1748
Author(s):  
Aitor Hierro ◽  
Jesus M. Arizmendi ◽  
Javier De Las Rivas ◽  
M. Angeles Urbaneja ◽  
Adelina Prado ◽  
...  

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