Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 655, Issue -, Pages 292-299Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.01.009
Keywords
Magnesium alloy; TIG; FSP; Rapid cooling; Microstructure; Mechanical properties
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Funding
- Fundamental Research Funds for the Central Universities of P.R. China [2014B11614, 2015B30514]
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In this study, tungsten inert gas (TIG) welded AZ31 magnesium alloy joint was subjected to two-pass rapid cooling friction stir processing (RC-FSP). The main results show that, two-pass RC-FSP causes the significant dissolution of the coarse eutectic beta-Mg17Al12 phase into the magnesium matrix and the remarkable grain refinement in the stir zone. The low-hardness region which frequently located at heat affected zone was eliminated. The stir zone showed ultrafine grains of 3.1 mu m, and exhibited a good combination of ultrahigh tensile strength of 284 MPa and large elongation of 7.1%. This work provides an effective strategy to enhance the strength of TIG welded magnesium alloy joint without ductility loss. (C) 2016 Elsevier B.V. All rights reserved.
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