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Friction stir additive manufacturing for high structural performance through microstructural control in an Mg based WE43 alloy
Highlights A Mg alloy build has been fabricated using friction stir additive manufacturing. Maximum hardness of 135HV was attained and is similar to Al 2XXX alloys. Good combination of strength (400MPa) and ductility (17%) was obtained. Origin of high strength and ductility are correlated with the microstructure.
Abstract Structural performance is a key challenge pertinent to additive manufacturing. A majority of the current techniques employed for metallic materials involve liquid–solid transformation and their performance is limited by solidification microstructures. Depending on the type of metallic alloy, this can be a serious impediment to structural properties. In this regard, solid-state additive manufacturing techniques have lagged behind. This study is focused on friction stir additive manufacturing (FSAM) as a potential technique to attain structurally efficient magnesium alloys. In this study, a multilayered stack of an Mg based WE43 alloy was built using FSAM at two different welding parameters. Formation of defects is sensitive to the heat input. In addition, dynamic recrystallization led to finer grain size (2–3μm). Such fine grain size coupled with desirable precipitate characteristics culminated in superior mechanical properties. Maximum hardness of 115HV was obtained in as-fabricated state and increased to 135HV after aging. These levels are similar to Al 2XXX alloys. In fact, in terms of strength, it translates to 400MPa and 17% ductility and is significantly higher than the base material subjected to aging. Mechanical properties have been correlated with detailed microstructural observations. Texture is discussed for a higher heat input sample using orientation imaging microscopy.
Friction stir additive manufacturing for high structural performance through microstructural control in an Mg based WE43 alloy
Highlights A Mg alloy build has been fabricated using friction stir additive manufacturing. Maximum hardness of 135HV was attained and is similar to Al 2XXX alloys. Good combination of strength (400MPa) and ductility (17%) was obtained. Origin of high strength and ductility are correlated with the microstructure.
Abstract Structural performance is a key challenge pertinent to additive manufacturing. A majority of the current techniques employed for metallic materials involve liquid–solid transformation and their performance is limited by solidification microstructures. Depending on the type of metallic alloy, this can be a serious impediment to structural properties. In this regard, solid-state additive manufacturing techniques have lagged behind. This study is focused on friction stir additive manufacturing (FSAM) as a potential technique to attain structurally efficient magnesium alloys. In this study, a multilayered stack of an Mg based WE43 alloy was built using FSAM at two different welding parameters. Formation of defects is sensitive to the heat input. In addition, dynamic recrystallization led to finer grain size (2–3μm). Such fine grain size coupled with desirable precipitate characteristics culminated in superior mechanical properties. Maximum hardness of 115HV was obtained in as-fabricated state and increased to 135HV after aging. These levels are similar to Al 2XXX alloys. In fact, in terms of strength, it translates to 400MPa and 17% ductility and is significantly higher than the base material subjected to aging. Mechanical properties have been correlated with detailed microstructural observations. Texture is discussed for a higher heat input sample using orientation imaging microscopy.
Friction stir additive manufacturing for high structural performance through microstructural control in an Mg based WE43 alloy
Palanivel, S. (author) / Nelaturu, P. (author) / Glass, B. (author) / Mishra, R.S. (author)
2014-09-30
19 pages
Article (Journal)
Electronic Resource
English
Microstructural Evolution of Friction Stir Treated WE43 Alloy
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