Strengthening in nanostructured 2024 aluminum alloy and its composites containing carbon nanotubes

被引：127

作者：

Choi, H. J. ^{[1
]}

Min, B. H. ^{[1
]}

Shin, J. H. ^{[1
]}

Bae, D. H. ^{[1
]}

机构：

[1] Yonsei Univ, Dept Mat Sci & Engn, Seoul 120749, South Korea

来源：

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2011年 / 42卷 / 10期

关键词：

Metal-matrix composites; Nano-structures; Mechanical properties; Powder processing; DUCTILITY; DEFORMATION; AL; BEHAVIOR; TEMPERATURE;

D O I：

10.1016/j.compositesa.2011.06.008

中图分类号：

T [工业技术];

学科分类号：

120111 [工业工程];

摘要：

The ultrafine-grained 2024 aluminum alloy (A2024) and A2024 matrix composites containing carbon nanotubes (CNTs) are developed. Three strengthening strategies of grain boundary hardening, age hardening and hardening by CNTs are employed. First, grain size of A2024 is effectively reduced using a ball-milling technique and A2024 with a grain size of 100 nm exhibits a yield stress of similar to 560 MPa, exhibiting a well agreement with the Hall-Petch relation. CNTs also have a great effect for strengthening. The A2024 matrix composite containing 3 vol.% CNTs shows a yield stress of 780 MPa with 2% tensile elongation to failure. Hardness is further increased after aging. The nanostructured composite shows its peak hardness after 4 h of aging because the refined grain boundaries and CNTs act as a pathway for diffusion of atoms with stimulating the aging process. The composite in the present study has great potential for application as structural materials in industry. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：1438 / 1444

页数：7

共 31 条

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