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Borkar, Hemant
Publications (3 of 3) Show all publications
Borkar, H., Seifeddine, S. & Jarfors, A. E. .. (2019). Microstructure, texture and mechanical properties of al alloy a380 prepared by directional solidification method. In: Manufacturing Sciences and Technologies IX: 9th International Conference on Manufacturing Science and Technology (ICMST 2018). Paper presented at 9th International Conference on Manufacturing Science and Technology, ICMST 2018, Kuala Lumpur, Malaysia, 11 - 13 August 2018 (pp. 18-23). Trans Tech Publications, 287
Open this publication in new window or tab >>Microstructure, texture and mechanical properties of al alloy a380 prepared by directional solidification method
2019 (English)In: Manufacturing Sciences and Technologies IX: 9th International Conference on Manufacturing Science and Technology (ICMST 2018), Trans Tech Publications, 2019, Vol. 287, p. 18-23Conference paper, Published paper (Refereed)
Abstract [en]

The mechanical properties of Al-Si alloys are affected by several microstructural features such as secondary dendrite arm spacing (SDAS), size and shape of eutectic Si-particles, presence of intermetallics as well as by porosity. In the current study, Al-Si-Cu alloy A380 was prepared by a unique directional solidification method to produce samples with two different SDAS of 9 μm and 27 μm. The lower solidification rate resulted in larger SDAS, larger grain size, larger eutectic Si and larger intermetallics including Fe-rich β phase. The microstructure with higher solidification rate was found to be finer and more homogeneous with smaller eutectic Si and intermetallics. The specimen with larger SDAS exhibited stronger texture than the one with smaller SDAS. The specimen with smaller SDAS showed improved mechanical properties including YS, UTS and ductility. 

Place, publisher, year, edition, pages
Trans Tech Publications, 2019
Series
Diffusion and defect data, solid state data. P. B, Solid state phenomena, ISSN 1012-0394, E-ISSN 1662-9779 ; 287
Keywords
Al-Si-Cu alloys, Electron backscattered diffraction, Secondary dendrite arm spacing, Solidification, Aluminum alloys, Copper alloys, Dendrites (metallography), Eutectics, Intermetallics, Manufacture, Mechanical properties, Textures, Electron back-scattered diffraction, Eutectic si, Microstructural features, Properties of Al, Si-Cu alloys, Size and shape, Solidification rate, Silicon alloys
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-43602 (URN)10.4028/www.scientific.net/SSP.287.18 (DOI)2-s2.0-85064218056 (Scopus ID)9783035713886 (ISBN)9783035733884 (ISBN)
Conference
9th International Conference on Manufacturing Science and Technology, ICMST 2018, Kuala Lumpur, Malaysia, 11 - 13 August 2018
Available from: 2019-05-07 Created: 2019-05-07 Last updated: 2019-05-07Bibliographically approved
Borkar, H., Seifeddine, S. & Jarfors, A. (2015). In-situ EBSD study of deformation behavior of Al-Si-Cu alloys during tensile testing. Materials & design, 84, 36-47
Open this publication in new window or tab >>In-situ EBSD study of deformation behavior of Al-Si-Cu alloys during tensile testing
2015 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 84, p. 36-47Article in journal (Refereed) Published
Abstract [en]

This study deals with the microstructural aspects of the deformation behavior in Al-Si-Cu alloy A380. This has been carried out with in-situ tensile testing coupled with EBSD analysis. The alloy specimens having different microstructures with two different secondary dendrite arm spacing (SDAS) of 9 µm and 27 µm were produced by the unique gradient solidification method. The study of misorientation distribution and texture evolution was performed with different tools in EBSD analysis. The texture was not significantly affected by deformation in both types of alloy specimens. With increase in the deformation, the microstructures are characterized by degradation of EBSD patterns and generation of substructures including low angle boundaries (LABs) and high angle boundaries (HABs). In both the microstructures with low and high SDAS, the boundaries were concentrated around eutectic phases; however this behavior was more pronounced at higher SDAS. The increase in the fraction of LABs with deformation was much higher in the microstructure with higher SDAS than with lower SDAS. This localized strain concentration was especially attributed to the large and elongated eutectic Si particles and Fe-rich intermetallics. The lower mechanical properties obtained at higher SDAS are the result of inhomogeneous strain distribution in the microstructure.

Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
Aluminium, Al alloys, as-cast alloys, EBSD, in-situ tensile tests, deformation
National Category
Engineering and Technology Materials Engineering
Identifiers
urn:nbn:se:hj:diva-27144 (URN)10.1016/j.matdes.2015.06.100 (DOI)000361147600005 ()2-s2.0-84941286595 (Scopus ID)
Available from: 2015-06-12 Created: 2015-06-12 Last updated: 2017-12-04Bibliographically approved
Borkar, H., Seifeddine, S. & Jarfors, A. (2015). Microstructure analysis of Al-Si-Cu alloys prepared by gradient solidification technique. International Journal of Modern Physics B, 29(10-11), Article ID 1540015.
Open this publication in new window or tab >>Microstructure analysis of Al-Si-Cu alloys prepared by gradient solidification technique
2015 (English)In: International Journal of Modern Physics B, ISSN 0217-9792, Vol. 29, no 10-11, article id 1540015Article in journal (Refereed) Published
Abstract [en]

Al–Si–Cu alloys were cast with the unique gradient solidification technique to producealloys with two cooling rates corresponding to secondary dendrite arm spacing (SDAS) of ∼9 and ∼27 μm covering the microstructural fineness of common die cast components.The microstructure was studied with optical microscopy and scanning electronmicroscopy (SEM) equipped with energy dispersive spectroscopy (EDS) and electronbackscattered diffraction (EBSD). The alloy with higher cooling rate, lower SDAS, hasa more homogeneous microstructure with well distributed network of eutectic and intermetallicphases. The results indicate the presence of Al–Fe–Si phases, Al–Cu phases andeutectic Si particles but their type, distribution and amount varies in the two alloys withdifferent SDAS. EBSD analysis was also performed to study the crystallographic orientationrelationships in the microstructure. One of the major highlights of this study is theunderstanding of the eutectic formation mechanism achieved by studying the orientationrelationships of the aluminum in the eutectic to the surrounding primary aluminumdendrites.

Keywords
aluminium, casting, gradient solidification, microstructure, EBSD
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-24688 (URN)10.1142/S0217979215400159 (DOI)000353523600016 ()2-s2.0-84928521654 (Scopus ID)
Available from: 2014-09-09 Created: 2014-09-09 Last updated: 2017-12-05Bibliographically approved
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