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

被引:50
作者
Heuer, JK
Okamoto, PR
Lam, NQ
Stubbins, JF
机构
[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
[2] Univ Illinois, Dept Nucl Engn, Urbana, IL 61801 USA
关键词
D O I
10.1063/1.126660
中图分类号
O59 [应用物理学];
学科分类号
摘要
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 degrees 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+-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 -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. [S0003-6951(00)03223-X].
引用
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页码:3403 / 3405
页数:3
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