Creep resistance of bulk copper-niobium composites: An inverse effect of multilayer length scale

被引：26

作者：

Avallone, Jaclyn T. ^{[1
]}

Nizolek, Thomas J. ^{[2
]}

Bales, Benjamin B. ^{[3
]}

Pollock, Tresa M. ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Mat Dept, Santa Barbara, CA 93106 USA

[2] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA

[3] Univ Calif Santa Barbara, Dept Mech Engn, Santa Barbara, CA 93106 USA

来源：

ACTA MATERIALIA | 2019年 / 176卷

关键词：

Cu-Nb; Creep; Multilayer; Length scale; TEMPERATURE MECHANICAL-BEHAVIOR; NB NANOLAMELLAR COMPOSITES; THERMAL-STABILITY; HIGH-STRENGTH; THIN-FILMS; DEFORMATION; INTERFACES; ORIENTATION; INSTABILITY; EVOLUTION;

D O I：

10.1016/j.actamat.2019.06.029

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Metallic multilayer systems show promising performance in extreme environments, with high stability of bi-metal interfaces down to nanometer length scales. The creep behavior of bulk, accumulative roll bonded (ARB) Copper-Niobium (Cu-Nb) composites has been studied at 400 degrees C as a function of layer thickness, ranging from 2 Am to 65 nm. Similar to single phase metallic systems, three regimes are observed during creep: transient, steady-state and tertiary. The mechanism controlling minimum creep rate for all conditions tested has a strong dependence on stress, consistent with dislocation-dominated creep. Unlike the conventional effect of grain size on creep resistance, this study reveals that decreasing length scale increases creep resistance. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：189 / 198

页数：10

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