粒界凝集エネルギーの第一原理計算
—bcc FeΣ3(111)粒界における溶質元素の偏析と脆化および強化効果—
2008 年 72 巻 9 号 p. 657-666
詳細
2008 年 72 巻 9 号 p. 657-666
The microscopic mechanism of the grain boundary embrittlement in metals by solute segregation has been not well understood for many years. From first-principles calculations, we show here that the calculated cohesive energy (2γint) of bcc iron Σ3(111) symmetrical tilt grain boundary is reduced by the segregation of sulfur (S) or phosphorous (P), while it is increased by the segregation of boron (B) or carbon (C). The rate of the decrease/increase in the 2γint was excellently proportional to the experimental ductile-to-brittle transition temparature (DBTT) shift with increasing segregation; this demonstrates that the grain boundary embrittlement is governed by the change in the 2γint.
