Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 257, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2020.123717
Keywords
Friction stir processing; A359 alloy; Si3N4 Tensile strength; Fracture analysis
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The study developed aluminum-based surface composites through friction stir processing, adjusting the number of FSP tool passes to control material properties. Results showed that the composite treated with a single FSP pass exhibited the maximum tensile strength and hardness. Furthermore, increasing the number of FSP tool passes can enhance the material's wear loss and thermal expansion.
Lightweight and high strength materials are the primary requirements in the field of defense like in aircraft structures and aerospace applications. In this context, aluminum-based composites are one of the suitable choices because of its improved characteristics. In the present work, an attempt is made to develop aluminum (A359) based surface composites by incorporating the Si3N4 particles through friction stir processing (FSP). The numbers of FSP tool passes (single, two and three) are considered as variable parameters to evaluate its effect on various characteristics. The microstructural examination has been carried out by optical microscope and surface morphological analysis was done by scanning electron microscopy images. EDS with mapping images are used to observe the phase distribution and to identify the elements of the alloying and reinforcement materials. The elemental presences are also validated by X-ray diffraction and Raman spectroscopy. Further, mechanical properties like tensile test supported by fracture analysis and Rockwell hardness profile of the FSP zone are also discussed. In addition to it, the present work also an emphasis on the effect of the number of FSP tool passes on its wear resistance and thermal expansion. The results revealed that the value of maximum tensile strength and hardness were found to be 576 MPa and 125 HRB respectively in single pass FSPed composite. However, if the number of passes is increased then the maximum wear loss (11.7 x 10(-3) g), maximum expansion due to heat (9 mm(3)) is observed at three-pass of FSP tool.
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