An Analysis of Strengthening Mechanisms and Rate-Dependence in a High Strength Aluminum Alloy

被引：16
作者：
Cao B. [1 ]
Shaeffer M. [1 ]
Cadel D. [1 ]
Ramesh K.T. [1 ]
Prasad S. [2 ]
机构：
[1] Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, MD
[2] CSIR-National Metallurgical Laboratory, Jamshedpur
来源：
Journal of Dynamic Behavior of Materials | 2018年 / 4卷 / 01期
关键词：
Aluminum; High strain rate; Mechanisms; Strength;
D O I：
10.1007/s40870-017-0136-0
中图分类号：
学科分类号：
摘要：
We examine the strengthening mechanisms within a high-strength aluminum alloy with the objective of providing guidelines for increased strength. First, we measure the mechanical behavior of the age-hardenable Al–Cu–Mg–Ag alloy known as Al 2139 in the T8 condition, and observe strengths of 500 MPa at quasistatic strain rates and average strengths of up to 600 MPa at high strain rates. Next, we explore the reasons for the high strength of this alloy by considering the contributions of various strengthening mechanisms to the total strength of the material. Finally, we develop an analytical approach to estimating the strengthening developed through the mechanism of dislocation cutting of closely spaced plate-like semi-coherent precipitates. Our results suggest that dislocation cutting of the Ω phase is the primary strengthening mechanism in this alloy. © 2017, Society for Experimental Mechanics, Inc.
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页码：6 / 17
页数：11
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