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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2017.1
- 수록면
- 272 - 282 (11page)
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초록· 키워드
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In this paper, molecular dynamics (MD) simulation based study of creep behavior for nanocrystalline (NC)Ni-3 at% Zr alloy having grain size ~ 6 nm has been performed using embedded atom method (EAM) potentialto study the influence of variation of temperature (1220-1450 K) as well as change in stress (0.5-1.5 GPa) oncreep behavior. All the simulated creep curves for this ultra-fine grained NC Ni-Zr alloy has extensive tertiarycreep regime. Primary creep regime is very short and steady state creep part is almost absent. The effect of temperaturesand stress is prominent on the nature of the simulated creep curves and corresponding atomicconfigurations. Additionally, mean square displacement calculation has been performed at 1220 K, 1250 K,1350 K, and 1450 K temperatures to correlate the activation energy of atomic diffusion and creep. Theactivation energy of creep process found to be less compared to activation energies of self-diffusion for Ni andZr in NC Ni-3 at% Zr alloy. Formation of martensite is identified during creep process by common neighbouranalysis. Presence of dislocations is observed only in primary regime of creep curve up till 20 ps, asevident from calculated dislocation density through MD simulations. Coble creep is found to be main operativemechanism for creep deformation of ultrafine grained NC Ni-3 at% Zr alloy.
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참고문헌 (55)
참고문헌 신청
B. S. Murty / 2013 / Textbook of Nanoscience and Nanotechnology / Springer Berlin Heidelberg :1~28
R. Kelsall / 2005 / Nanoscale Science and Technology / John Wiley & Sons :272~276
H. Gleiter / 1989 / Prog. Mater. Sci 33:223
H. Gleiter / 2000 / Acta Mater 48:1
C. Suryanarayana / 1995 / Int. Mater. Rev 40:41
R. Kelsall / 2005 / Nanoscale Science and Technology / John Wiley & Sons :272~276
H. Gleiter / 1989 / Prog. Mater. Sci 33:223
H. Gleiter / 2000 / Acta Mater 48:1
C. Suryanarayana / 1995 / Int. Mater. Rev 40:41
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