Formation of Face-Centered Cubic Phase in Ti35 Alloy Under In Situ Heating Transmission Electron Microscopy

A thermally induced hexagonal close-packed (HCP) to face-centered cubic (FCC) phase transition was investigated in an α-type Ti35 alloy with twinned structure by situ heating transmission electron microscopy (TEM) and ab initio calculations. TEM observations indicated that the HCP FCC occurred both within matrix/twin at twin boundaries thinner region of film, FCC-Ti precipitated as plates matrix/twin, while equiaxed cells boundaries. The crystallographic orientation relationship between HCP-Ti can be described as: $$\left\{ {111} \right\}_{{{\text{FCC}}}} //\left\{ {0002} \right\}_{{{\text{HCP}}}} \;{\text{and}}\; < 110 >\,_{{{\text{FCC}}}} //\, <1\overline{2} 10>\,_{{{\text{HCP}}}}$$ . accomplished forming intermediate state a BB stacking sequence through slip partial dislocations. formation such may related thermal stress temperature. Ab calculations showed also contamination interstitial atoms oxygen.