Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 22-23, Pages 7093-7102Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.06.004
Keywords
Friction Stir welding parameters; Brass; Aluminum 1050; Mechanical properties; Metallurgical properties; Intermetallic compound
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In this research, the effect of Friction Stir welding parameters on mechanical and metallurgical properties of aluminum 1050/brass (70%Cu-30%Zn) joints was investigated. Optical microscopy, SEM, X-ray diffraction analysis and EDS analysis were used to probe microstructures and chemical compositions. In order to examine mechanical properties, besides hardness test, tensile strength of the welds was measured. The main parameters in this study were the tool rotational speed, offset, welding speed, and depth of the sinking pin. The maximum ultimate tensile strength of the joint reached in this research was 80% of the base metal (aluminum). Results show that the optimum parameters will yield a defect free joint arisen from a suitable material flow and a narrow multilayer intermetallic compound at interface in addition to a composite structure in the stir zone which all result in a strong joint. Also, by leaving the optimized condition, occurrence of large brass fragments and weld defects lower weld strength besides shifting fracture path from interface to the stir zone. Also, according to the results, using low rotation speed is accompanied by disappearance of interfacial intermetallic layer, whereas fast rotation will thicken this layer. Moreover, severe mechanical twining is observed in TMAZ of brass which leads to high values of hardness in this region. (C) 2011 Elsevier B.V. All rights reserved.
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