Tensile behavior of a nanocrystalline Ni-Fe alloy

被引：107

作者：

Li, Hongqi ^{[1
]}

Ebrahimi, Fereshteh ^{[1
]}

机构：

[1] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA

来源：

ACTA MATERIALIA | 2006年 / 54卷 / 10期

基金：

美国国家科学基金会;

关键词：

nanocrystalline metals; tensile properties; fracture behavior; deformation transition;

D O I：

10.1016/j.actamat.2006.02.033

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The tensile properties, deformation and fracture behavior of an electrodeposited nanocrystalline Ni-15% Fe alloy with an average grain size of 9 nm were investigated. The combination of high strength (2.4 GPa), good tensile elongation (6%) and reasonable fracture toughness (16 MPa m(1/2)) obtained for this material suggests that nanocrystalline face-centered cubic metals are inherently ductile and have attractive mechanical properties. The large tensile elongation is proposed to be associated with the persistence of strain hardening at large strains. The results of this study reveal that plastic instability precedes fracture and the degree of reduction in area is much higher under plane stress condition. It is shown that at the nanoscale, consistent with theoretical predictions.. the crack follows an intergranular path, but crack propagation is accompanied by considerable plasticity. According to a detailed fractographic analysis, a fracture scenario is established aimed at understanding the tensile fracture process in nanocrystal line face-centered cubic metals. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：2877 / 2886

页数：10

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