Ab-initio search for cohesion-enhancing solute elements at grain boundaries in molybdenum and tungsten

作者：Scheiber Daniel^*; Pippan Reinhard; Puschnig Peter; Ruban Andrei; Romaner Lorenz

来源：International Journal of Refractory Metals and Hard Materials, 2016, 60: 75-81.

DOI：10.1016/j.ijrmhm.2016.07.003

• DFT
• GB cohesion
• Segregation
• Transition elements

The influence of all transition element dopants on grain boundary (GB) cohesion in both W and Mo is investigated by means of high throughput density functional theory (DFT) calculations. We present site specific segregation energies to GBs and free surfaces (FS) of W and Mo and evaluate the strength of embrittlement of the individual solutes. The segregation properties for a consistent set of solutes allow an unprecedented comparison to previous DFT data and phenomenological models for segregation. Our OFT data show that the trends are very similar in W and Mo for the different solutes, while the comparison with available phenomenological models highlights the limits of band-filling and elastic models for GB segregation and strengthening.

• 出版日期2016-11