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Title: Relationship between segregation-induced intergranular fracture and melting in the nickel-sulfur system

Abstract

The effect of S segregation to grain boundaries on the intergranular embrittlement of Ni has been studied at room temperature using Auger electron spectroscopy and slow strain rate tensile tests. The grain-boundary S concentration was varied by time-controlled annealing of dilute Ni-S alloy specimens at 625 degree sign C. The ductile-to-brittle transition in Ni, as determined from percent integranular fracture and reduction-in-area measurements, occurred over a narrow range of S concentrations centered on 15.5{+-}3.4 at. % S. This critical S concentration for 50% intergranular fracture of polycrystalline Ni is similar to the 14.2{+-}3.3 at. % S required to induce 50% amorphization of single-crystal Ni by S{sup +}-ion implantation. This suggests that segregation-induced intergranular fracture, like implantation-induced amorphization, may be a disorder-induced polymorphous melting process. In agreement with experimental observations, the polymorphous melting curve for the Ni-S solid solution on the phase diagram drops rapidly to zero as the alloy composition approaches {approx}18 at. % S. The critical grain-boundary concentration for intergranular fracture, while slightly less, is within experimental error of the concentration predicted for polymorphous melting as well as that measured for ion-implantation-induced amorphization. (c) 2000 American Institute of Physics.

Authors:
 [1];  [2];  [1];  [1];  [3]
  1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  2. (United States)
  3. Department of Nuclear Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL
OSTI Identifier:
20216507
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 76; Journal Issue: 23; Other Information: PBD: 5 Jun 2000; Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NICKEL; GRAIN BOUNDARIES; FRACTURE PROPERTIES; SULFUR; AUGER ELECTRON SPECTROSCOPY; ANNEALING; DUCTILE-BRITTLE TRANSITIONS; AMORTIZATION; MELTING; EXPERIMENTAL DATA

Citation Formats

Heuer, J. K., Department of Nuclear Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, Okamoto, P. R., Lam, N. Q., and Stubbins, J. F. Relationship between segregation-induced intergranular fracture and melting in the nickel-sulfur system. United States: N. p., 2000. Web. doi:10.1063/1.126660.
Heuer, J. K., Department of Nuclear Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, Okamoto, P. R., Lam, N. Q., & Stubbins, J. F. Relationship between segregation-induced intergranular fracture and melting in the nickel-sulfur system. United States. doi:10.1063/1.126660.
Heuer, J. K., Department of Nuclear Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, Okamoto, P. R., Lam, N. Q., and Stubbins, J. F. Mon . "Relationship between segregation-induced intergranular fracture and melting in the nickel-sulfur system". United States. doi:10.1063/1.126660.
@article{osti_20216507,
title = {Relationship between segregation-induced intergranular fracture and melting in the nickel-sulfur system},
author = {Heuer, J. K. and Department of Nuclear Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 and Okamoto, P. R. and Lam, N. Q. and Stubbins, J. F.},
abstractNote = {The effect of S segregation to grain boundaries on the intergranular embrittlement of Ni has been studied at room temperature using Auger electron spectroscopy and slow strain rate tensile tests. The grain-boundary S concentration was varied by time-controlled annealing of dilute Ni-S alloy specimens at 625 degree sign C. The ductile-to-brittle transition in Ni, as determined from percent integranular fracture and reduction-in-area measurements, occurred over a narrow range of S concentrations centered on 15.5{+-}3.4 at. % S. This critical S concentration for 50% intergranular fracture of polycrystalline Ni is similar to the 14.2{+-}3.3 at. % S required to induce 50% amorphization of single-crystal Ni by S{sup +}-ion implantation. This suggests that segregation-induced intergranular fracture, like implantation-induced amorphization, may be a disorder-induced polymorphous melting process. In agreement with experimental observations, the polymorphous melting curve for the Ni-S solid solution on the phase diagram drops rapidly to zero as the alloy composition approaches {approx}18 at. % S. The critical grain-boundary concentration for intergranular fracture, while slightly less, is within experimental error of the concentration predicted for polymorphous melting as well as that measured for ion-implantation-induced amorphization. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.126660},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 23,
volume = 76,
place = {United States},
year = {2000},
month = {6}
}