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Particle refinement and fine-grain formation leading to enhanced mechanical behaviour in a hypo-eutectic Al-Si alloy subjected to multi-pass friction stir processing
Sumit Meenia, Md Faseeulla Khan, S. Babu, R. J. Immanuel, ,
Published in Elsevier Inc.
2016
Volume: 113
   
Pages: 134 - 143
Abstract
The present research aims at studying the synergetic effect of pre-process thermal treatment and multi pass friction stir processing (FSP) on microstructure and mechanical properties of a hypo-eutectic Al-Si automotive alloy. The effect of FSP with and without pre-process thermal treatment is studied up to 3 passes and it is found that both the size of silicon particles and aluminium grains become finer with increasing FSP passes. Maximum particle and grain refinement is observed in the material subjected to 3 passes of FSP with pre-process thermal treatment. The thermal treatment prior to FSP led to spheroidization of silicon particles which influenced the particle and grain refinement during FSP to a great extent. The effect of microstructural modification by FSP on the mechanical properties has been studied by micro-hardness and tensile testing. The 3 pass FSPed material without thermal treatment showed maximum ductility of 36.5%. However, maximum tensile strength of 251 MPa is obtained in the 3 pass FSPed material with pre-process thermal treatment. The various mechanisms involved in enhancing the mechanical properties are explained by means of fractography results and the microstructural evolution during multiple FSP passes.
About the journal
JournalData powered by TypesetMaterials Characterization
PublisherData powered by TypesetElsevier Inc.
ISSN10445803
Open AccessNo
Concepts (24)
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    Aluminum
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    Dynamic recrystallization
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    Eutectics
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    FRACTURE MECHANICS
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    Friction
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    Friction stir welding
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    Grain size and shape
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    Heat treatment
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    Mechanical properties
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    Mechanisms
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    Silicon
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    Silicon alloys
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    Tensile strength
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    Tensile testing
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    Tribology
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    Al-si alloy
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    AUTOMOTIVE ALLOYS
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    EUTECTIC AL-SI ALLOYS
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    Mechanical behaviour
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    MICROSTRUCTURAL MODIFICATION
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    Microstructure and mechanical properties
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    Multi-pass friction stir processing
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    Silicon particles
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    Grain refinement