Tensile behavior of a nanocrystalline Ni-Fe alloy
Tensile behavior of a nanocrystalline Ni-Fe alloy
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DOI：
10.1016/j.actamat.2006.02.033
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发表时间：
2006-06-01
期刊：
影响因子：
9.4
通讯作者：
Ebrahimi, Fereshteh
中科院分区：
文献类型：
--
作者：
Li, Hongqi;Ebrahimi, Fereshteh
研究了平均晶粒尺寸为9 nm的纳米晶Ni-15% Fe合金的拉伸性能、变形和断裂行为。高强度（2.4 GPa），良好的拉伸伸长率（6%）和合理的断裂韧性（16 MPa m（1/2）），这种材料的组合表明，纳米晶面心立方金属固有的韧性，并具有吸引人的机械性能。大的拉伸延伸率被认为与大应变下的应变硬化的持续性有关。研究结果表明，在平面应力条件下，塑性失稳先于断裂，断面收缩程度更大。结果表明，在纳米尺度下，与理论预测一致。裂纹沿着晶间路径，但裂纹扩展伴随着相当大的塑性。根据详细的断口分析，建立了旨在了解纳米晶线面心立方金属拉伸断裂过程的断裂情景。(c)2006 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
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.