Novel welding of Al0.5CoCrFeNi high-entropy alloy: Corrosion behavior

Laser welding of Al0.5CoCrFeNi high-entropy alloy has been studied in detail. Base metal (BM) shows equiaxed grains with three different regions; (a) Cr–Fe rich, (b) Al–Ni rich phases and (c) Al-rich particle. Laser welding has resulted in evolution of columnar dendritic microstructure with dissolut...

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Veröffentlicht in:	Journal of alloys and compounds 2020-03, Vol.817, p.153163, Article 153163
Hauptverfasser:	Sokkalingam, R., Sivaprasad, K., Duraiselvam, M., Muthupandi, V., Prashanth, K.G.
Format:	Artikel
Sprache:	eng
Schlagworte:	Aluminum Automobile industry Base metal Chromium Corrosion behavior Corrosion currents Corrosion potential Corrosion rate Current density High entropy alloys Iron Laser beam welding Laser welding Microscopy Nickel Weld metal
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creator	Sokkalingam, R. Sivaprasad, K. Duraiselvam, M. Muthupandi, V. Prashanth, K.G.
description	Laser welding of Al0.5CoCrFeNi high-entropy alloy has been studied in detail. Base metal (BM) shows equiaxed grains with three different regions; (a) Cr–Fe rich, (b) Al–Ni rich phases and (c) Al-rich particle. Laser welding has resulted in evolution of columnar dendritic microstructure with dissolution of Al rich particles in the weld metal (WM), where dendrites are Cr–Fe rich and interdendrites are Al–Ni rich regions. The corrosion experiment shows higher corrosion current density (2.83 × 10−5 mA/cm2) in WM than the BM (8.63 × 10−6 mA/cm2) implies higher corrosion rate. However, the WM exhibits higher (nobler) corrosion potential as compared to BM. Due to this nobler potential, WM acts as the cathode and the BM act as an anode when weldment (BM + WM) is analyzed. Hence, the weldment (BM + WM) exhibits lower corrosion current density (4.11 × 10−6 mA/cm2) like BM. [Display omitted] •Laser welding was effectively employed for welding Al0.5CoCrFeNi high-entropy alloys (HEA).•Corrosion behavior of high-entropy alloy weld was studied for first time.•Weldment show better corrosion resistance in aqueous medium than the base metal.
doi_str_mv	10.1016/j.jallcom.2019.153163
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Base metal (BM) shows equiaxed grains with three different regions; (a) Cr–Fe rich, (b) Al–Ni rich phases and (c) Al-rich particle. Laser welding has resulted in evolution of columnar dendritic microstructure with dissolution of Al rich particles in the weld metal (WM), where dendrites are Cr–Fe rich and interdendrites are Al–Ni rich regions. The corrosion experiment shows higher corrosion current density (2.83 × 10−5 mA/cm2) in WM than the BM (8.63 × 10−6 mA/cm2) implies higher corrosion rate. However, the WM exhibits higher (nobler) corrosion potential as compared to BM. Due to this nobler potential, WM acts as the cathode and the BM act as an anode when weldment (BM + WM) is analyzed. Hence, the weldment (BM + WM) exhibits lower corrosion current density (4.11 × 10−6 mA/cm2) like BM. [Display omitted] •Laser welding was effectively employed for welding Al0.5CoCrFeNi high-entropy alloys (HEA).•Corrosion behavior of high-entropy alloy weld was studied for first time.•Weldment show better corrosion resistance in aqueous medium than the base metal.</description><identifier>ISSN: 0925-8388</identifier><identifier>EISSN: 1873-4669</identifier><identifier>DOI: 10.1016/j.jallcom.2019.153163</identifier><language>eng</language><publisher>Lausanne: Elsevier B.V</publisher><subject>Aluminum ; Automobile industry ; Base metal ; Chromium ; Corrosion behavior ; Corrosion currents ; Corrosion potential ; Corrosion rate ; Current density ; High entropy alloys ; Iron ; Laser beam welding ; Laser welding ; Microscopy ; Nickel ; Weld metal</subject><ispartof>Journal of alloys and compounds, 2020-03, Vol.817, p.153163, Article 153163</ispartof><rights>2019 Elsevier B.V.</rights><rights>Copyright Elsevier BV Mar 15, 2020</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c337t-b464f8e1caa52260db1620071a37969b529f0ea76845885815dfc22004d740353</citedby><cites>FETCH-LOGICAL-c337t-b464f8e1caa52260db1620071a37969b529f0ea76845885815dfc22004d740353</cites><orcidid>0000-0003-4358-3659 ; 0000-0001-5644-2527 ; 0000-0002-4146-1626 ; 0000-0001-8189-8294</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0925838819344093$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids></links><search><creatorcontrib>Sokkalingam, R.</creatorcontrib><creatorcontrib>Sivaprasad, K.</creatorcontrib><creatorcontrib>Duraiselvam, M.</creatorcontrib><creatorcontrib>Muthupandi, V.</creatorcontrib><creatorcontrib>Prashanth, K.G.</creatorcontrib><title>Novel welding of Al0.5CoCrFeNi high-entropy alloy: Corrosion behavior</title><title>Journal of alloys and compounds</title><description>Laser welding of Al0.5CoCrFeNi high-entropy alloy has been studied in detail. Base metal (BM) shows equiaxed grains with three different regions; (a) Cr–Fe rich, (b) Al–Ni rich phases and (c) Al-rich particle. Laser welding has resulted in evolution of columnar dendritic microstructure with dissolution of Al rich particles in the weld metal (WM), where dendrites are Cr–Fe rich and interdendrites are Al–Ni rich regions. The corrosion experiment shows higher corrosion current density (2.83 × 10−5 mA/cm2) in WM than the BM (8.63 × 10−6 mA/cm2) implies higher corrosion rate. However, the WM exhibits higher (nobler) corrosion potential as compared to BM. Due to this nobler potential, WM acts as the cathode and the BM act as an anode when weldment (BM + WM) is analyzed. Hence, the weldment (BM + WM) exhibits lower corrosion current density (4.11 × 10−6 mA/cm2) like BM. 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Base metal (BM) shows equiaxed grains with three different regions; (a) Cr–Fe rich, (b) Al–Ni rich phases and (c) Al-rich particle. Laser welding has resulted in evolution of columnar dendritic microstructure with dissolution of Al rich particles in the weld metal (WM), where dendrites are Cr–Fe rich and interdendrites are Al–Ni rich regions. The corrosion experiment shows higher corrosion current density (2.83 × 10−5 mA/cm2) in WM than the BM (8.63 × 10−6 mA/cm2) implies higher corrosion rate. However, the WM exhibits higher (nobler) corrosion potential as compared to BM. Due to this nobler potential, WM acts as the cathode and the BM act as an anode when weldment (BM + WM) is analyzed. Hence, the weldment (BM + WM) exhibits lower corrosion current density (4.11 × 10−6 mA/cm2) like BM. [Display omitted] •Laser welding was effectively employed for welding Al0.5CoCrFeNi high-entropy alloys (HEA).•Corrosion behavior of high-entropy alloy weld was studied for first time.•Weldment show better corrosion resistance in aqueous medium than the base metal.</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/j.jallcom.2019.153163</doi><orcidid>https://orcid.org/0000-0003-4358-3659</orcidid><orcidid>https://orcid.org/0000-0001-5644-2527</orcidid><orcidid>https://orcid.org/0000-0002-4146-1626</orcidid><orcidid>https://orcid.org/0000-0001-8189-8294</orcidid></addata></record>
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subjects	Aluminum Automobile industry Base metal Chromium Corrosion behavior Corrosion currents Corrosion potential Corrosion rate Current density High entropy alloys Iron Laser beam welding Laser welding Microscopy Nickel Weld metal
title	Novel welding of Al0.5CoCrFeNi high-entropy alloy: Corrosion behavior
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