Metals, Volume 9, Issue 10 (October 2019) – 111 articles
Cover Story (view full-size image): Iron undergoes a phase transformation from body-centered cubic structure to the metastable hexagonal close-packed phase under high pressure. However, the interplay of defects in bcc with the transformation process is still unclear. We investigated the role of twins, dislocations, and Cottrell atmospheres in changing the crystalline iron structure during this phase transformation by using Monte Carlo methods and atomistic simulations. Our results show that, under hydrostatic compression, the transformation process is accelerated for crystals containing twin boundaries. The presence of Cottrell atmospheres surrounding an edge dislocation in bcc iron retards the development of the hcp phase. View this paper
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