Abstract：
:By means of first principles calculation and experiments, a detailed mechanism is proposed to include the stages of slip, adjustment, and expansion for the HCP → FCC phase transformation with the prismatic relation of [Formula: see text] and [Formula: see text] in titanium. It is revealed that the formation of four FCC layers is preferable after the slip of Shockley partial dislocations of 1/6 [Formula: see text] on [Formula: see text] planes, and that the adjustment of interplanar spacing and the volume expansion are energetically favorable and could happen spontaneously without any energy barrier. It is also found that the transformed FCC lattice first follows the c/a ratio (1.583) of HCP and then becomes an ideal FCC structure (c/a = √2). The proposed mechanism could not only provide a deep understanding to the process of HCP → FCC prismatic transformation in titanium, but also clarify the controversy regarding volume expansion of HCP-FCC phase transition of titanium in the literature.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Yang JX,Zhao HL,Gong HR,Song M,Ren QQdoi
10.1038/s41598-018-20257-9subject
Has Abstractpub_date
2018-01-31 00:00:00pages
1992issue
1issn
2045-2322pii
10.1038/s41598-018-20257-9journal_volume
8pub_type
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