Segregation behavior of alloying elements in different oriented single crystal nickel based superalloys

The micro-segregation behavior of different oriented single crystal nickel based superalloys in directional solidification has been explored. The results show that the segregation level in the dendrite structure has relationship with the crystal orientation. In general, with increasing deviation angle from the <001> orientation, the segregation coefficients of Al, Ti and Ta increase, and the segregation coefficients of W and Co decrease. The segregation degree of Al, Ta, W and Co increases with the misorientation in the <011> oriented crystals, except for Ti. Segregation of Mo and Cr is less affected by the orientation variation. Different misorientations also lead to different segregation profiles. The crystal with smaller deviation angle from the <001> orientation has a shorter segregation distance.