Title

High Strain Rate Superplasticity in Friction Stir Processed Al-Mg-Zr Alloy

Abstract

Al-4Mg-1Zr extruded bar was subjected to friction stir processing (FSP), resulting in generation of a fine microstructure of 1.5 μm grain size. Superplastic deformation behavior of FSP Al-4Mg-1Zr alloy was investigated in strain rate range of 1×10−3 to 1 s−1 and temperature range of 350-550 °C and compared with that of as-rolled one. It is indicated that the FSP alloy exhibited significantly enhanced superplasticity at a high strain rate of 1×10−1 s−1, and a maximum elongation of 1280% was obtained at 525 °C and 1×10−1 s−1. Further, the FSP Al-4Mg-1Zr alloy exhibited excellent thermal stability at high temperature, and a large elongation of 1210% was observed at 550 °C and 1×10−1 s−1. Moreover, FSP resulted in a significant decrease in the flow stress in Al-4Mg-1Zr alloy. At a strain rate of 1×10−2 s−1, the flow stress ( 7 MPa) of FSP Al-4Mg-1Zr at 450 °C was comparable to that of as-rolled alloy at 550 °C.

Department(s)

Materials Science and Engineering

Sponsor(s)

National Science Foundation (U.S.)
United States. Office of Naval Research

Keywords and Phrases

Al-Mg-Zr Alloy; Friction Stir Processing; High Strain Rate Superplasticity

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2003 Elsevier, All rights reserved.

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