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08-04-2016

Correlation between process parameters, grain size and hardness of friction-stir-welded Cu–Zn alloys

Authors: Akbar Heidarzadeh, Tohid Saeid

Published in: Rare Metals | Issue 5/2018

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Abstract

In this study, the effects of tool rotational speed, tool traverse speed, and Zn content on the grain size and hardness of the friction-stir-welded (FSWed) Cu–Zn alloy joints were investigated. The microstructures of the joints were examined using optical microscope (OM) and scanning transmission electron microscope (STEM). Vickers hardness test was conducted to evaluate the hardness of the joints. In addition, the relationships between the process parameters, grain size, and hardness of the joints were established. The results show that the developed relationships predict the grain size and hardness of the joints accurately. The Zn content of the alloys is the most effective parameter on the grain size and hardness, where the tool traverse speed has the minimum effect. The relationship between the hardness and grain size of the joints has a deviation from the Hall–Petch equation due to formation of high dislocation density inside the grains. At higher Zn amounts, the dislocation tangles with high density form instead of dislocation cells, and hence, lower conformity with the Hall–Petch relationship is observed.

previous article Precipitates and corrosion resistance of an Al–Zn–Mg–Cu–Zr plate with different percentage reduction per passes

next article Forming and growing mechanisms of homogenization-solution pores in a single crystal superalloy

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Title: Correlation between process parameters, grain size and hardness of friction-stir-welded Cu–Zn alloys
Authors: Akbar Heidarzadeh
Tohid Saeid
Publication date: 08-04-2016
Publisher: Nonferrous Metals Society of China
Published in: Rare Metals / Issue 5/2018
Print ISSN: 1001-0521
Electronic ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-016-0704-9

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