Point defect interactions in iron lattice:a firstprinciples study
The interaction of point defects(interstitial atoms and vacancy)in both BCC Fe and FCC Fe lattices were investigated by first-principles calculations.The goals were to find the equilibrium separation of two interstitial atoms in the iron lattice and to establish the maximum trapping capacity of a mono-vacancy in the iron lattice.Based on our study,the equilibrium separation values of C–C,B–B and C–B were about 5.31((A))in the BCC Fe lattice.In the FCC Fe lattice,the equilibrium separation of C–C,B–B and C–B was about 6.42((A)).A mono-vacancy is shown to be capable of steady trapping as many as 3 atoms to form VXn(X = C/B,n = 0,1,2,and 3)and VCB,VC2B and VCB2 complexes in the BCC Fe lattice.For the FCC Fe lattice,it is energetically favorable for a mono-vacancy to accommodate 2 C atoms,3 B atoms,2 C atoms and 1 B atoms,1 C atoms and 2 B atoms,and 1 C atoms and 3 B atoms to form VC2,VB3,VC2B,VCB2 and VCB3 clusters,respectively.However,when four interstitial atoms are in the same plane and occupy the nearest interstitial sites around the vacancy,they can also form VC4,VB4,VC2B2 and VCB3 in the BCC Fe lattice and VB4 and VC2B2 in the FCC Fe lattice.Moreover,we also found that the trapping ability of a vacancy is stronger in BCC Fe than in FCC Fe.These results are in good agreement with the available calculations and experiments results.
TianWei He YeHua Jiang Rong Zhou Jing Feng
Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650 Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650
国内会议
大连
英文
520-528
2016-09-24（万方平台首次上网日期，不代表论文的发表时间）