A high temperature nanoindentation study of Al-Cu wrought alloy

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:644

Article

Koch, Susanne^1,2  Abad, Manuel D.¹  Renhart, Susanna²  Antrekowitsch, Helmut²  Hosemann, Peter¹ 

[1] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA

[2] Univ Leoben, Inst Nonferrous Met, Dept Met, A-8700 Leoben, Austria

关键词: Mechanical characterization;    Nanoindentation;    Aluminum alloys;    Age hardening;   

DOI  :  10.1016/j.msea.2015.07.066

来源: Elsevier

【 摘 要 】

Aluminum-copper alloys are widely used because of their low density and good mechanical strength accomplished with precipitation hardening. The alloy Al-Cu-Mg-Pb (AA2030) has been investigated before and after aging, at room temperature and at high temperatures. The mechanical properties at room temperature have been studied by Brinell hardness tests. T4 and T6 stages of the alloy have been investigated by differential scanning calorimetry up to 450 degrees C, showing the precipitation of different clusters. High temperature nanoindentation has been used to characterize the mechanical properties up to 460 degrees C in order to obtain a better understanding of the local dominating deformation mechanism in the material. A continuous decrease in the hardness and Young's modulus was found with the increasing temperature. The strain rate sensitivity of the alloy increased with the temperature from 0.022 at RT, up to 0.16 at 460 degrees C. The activation volume was constant (around 31-41 b(3)) up to 240 degrees C, beyond this point a large increase was observed up to 178 b(3). The results were comparable with similar materials, and indicate thermally activated processes. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free