Microstructure evolution during cold rolling in a nanocrystalline Ni-Fe alloy determined by synchrotron X-ray diffraction

被引：71

作者：

Li, L. ^{[1
]}

Ungar, T. ^{[2
]}

Wang, Y. D. ^{[3
]}

Morris, J. R. ^{[1
,4
]}

Tichy, G. ^{[2
]}

Lendvai, J. ^{[2
]}

Yang, Y. L. ^{[6
]}

Ren, Y. ^{[5
]}

Choo, H. ^{[1
]}

Liaw, P. K. ^{[1
]}

机构：

[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[2] Eotvos Lorand Univ, Dept Mat Phys, H-1518 Budapest, Hungary

[3] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China

[4] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[5] Argonne Natl Lab, Xray Sci Div, Argonne, IL 60439 USA

[6] Jiangxi Acad Sci, Inst Appl Phys, Nanchang 330029, Peoples R China

来源：

ACTA MATERIALIA | 2009年 / 57卷 / 17期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

Nanocrystalline; Grain growth; Detwinning; X-ray line-profile analysis; Far-from-equilibrium state; STACKING-FAULT ENERGY; GRAIN-GROWTH; PLASTIC-DEFORMATION; DISLOCATION-STRUCTURE; PROFILE ANALYSIS; THIN-FILMS; METALS; NICKEL; SIZE; TEMPERATURE;

D O I：

10.1016/j.actamat.2009.07.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Stress softening after cold rolling is observed in an electrodeposited nanocrystalline Ni-Fe alloy. The grain-size distribution becomes much broader after the cold rolling. Microstructure changes, though moderate, such as simultaneously decreased dislocation and twin densities with grain growth during cold rolling, are systematically proved by synchrotron high-energy X-ray diffraction, transmission electron microscopy and differential scanning calorimetry (DSC). The amorphous fractions in the form of grain boundaries are evidenced by the diffuse-background scatterings and large DSC values. Partial dislocation separation calculation, a dislocation mean free path and annihilation model, and texture development together reveal that the current nanocrystalline Ni-Fe alloy exhibits the combined behavior of perfect dislocation slip and grain-boundary mediated deformation. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：4988 / 5000

页数：13

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