Atomistic simulation of the effects of hydrogen on the mobility of edge dislocation in alpha iron
Despite extensive investigations concerning hydrogen embrittlement mechanisms, not all the effects of hydrogen on material properties have been clarified. One of the effects of hydrogen is an enhancement of plasticity localisation and is known as the hydrogen enhanced localised plasticity (HELP) mechanism . An in situ observation of the dislocations under a hydrogen gaseous environment was performed using a transmission electron microscope (TEM), which revealed the reduction of the distance between dislocations when hydrogen gas was added into the environmental cell [2, 3]. Such a plasticity localisation is observed in a large number of materials and slip systems . Therefore, these experimental results are considered to be powerful evidence of HELP. Although the experimental observations show only the reduction of the distance between dislocations under a hydrogen gaseous environment, the precise reason for this reaction is still unclear. Elasticity analyses suggest that...
KeywordsConjugate Gradient Method Hydrogen Embrittlement Edge Dislocation Dislocation Core Embed Atom Method
This research was performed as part of the Fundamental Research Project on Advanced Hydrogen Science funded by the New Energy and Industrial Technology Development Organization (NEDO). The research has also been partially supported by the ENEOS Hydrogen Trust Fund and the Ministry of Education, Science, Sports and Culture’s Grant-in-Aid for Young Scientists (A), 19686013, 2007.
- 4.Birnbaum HK, Robertson IM, Sofronis P, Teter D (1997) In: Magnin T (ed) Corrosion-deformation interactions, Inst. of Mat, p 172Google Scholar
- 9.Jónsson H, Mills G, Jacobsen KW (1998) In: Berne BJ et al (eds) Classical and quantum dynamics in condensed phase simulations. World Scientific, Singapore, p 385Google Scholar
- 10.Bastien P, Azou P (1951) Compt Rend Acad Sci 232:1845Google Scholar
- 11.Miyazaki N, Matsumoto R, Nishimura K, Matsumoto S (2007) Proc. International Hydrogen Energy Development Forum, p 125Google Scholar
- 13.Choo WY, Lee JY (1982) Metall Trans A 13A:135Google Scholar