Liquid metal embrittlement of a dual-phase Al0.7CoCrFeNi high-entropy alloy exposed to oxygen-saturated lead-bismuth eutectic - Details

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Abstract：

This　paper　reports　a　new　liquid　metal　embrittlement　(LME)　system　in　which　a　dual-phase　Al0.7CoCrFeNi　(equimolar　fraction)　high-entropy　alloy　(HEA)　is　embrittled　by　lead-bismuth　eutectic　(LBE)　at　350　and　500　degrees　C.　At　350　degrees　C,　(Ni,　Al)-rich　BCC　phase　is　embrittled,　leading　to　intragrain　cracking　within　this　phase,　while　the　predominant　cracking　mode　changes　to　BCC/FCC　phase　boundary　decohesion　at　500　degrees　C.　At　both　temperatures,　cracks　are　rarely　seen　in　the　(Co,　Cr,　Fe)-rich　FCC　phase,　indicating　that　this　phase　is　immune　to　LME.　Furthermore,　the　results　suggest　a　transition　from　an　adsorption-dominated　LME　mechanism　at　350　degrees　C　to　a　phase　boundary　wetting-dominated　LME　mechanism　at　500　degrees　C.　(C)　2020　Acta　Materialia　Inc.　Published　by　Elsevier　Ltd.　All　rights　reserved.

Keyword：

Cracking High-entropy alloys LBE Liquid metal embrittlement Phase boundary wetting

Community：

[ 1 ] [Gong, Xing]Shenzhen Univ, Coll Phys & Optoelect Engn, Adv Nucl Energy Res Team, Shenzhen 518060, Peoples R China
[ 2 ] [Chen, Jiajun]Shenzhen Univ, Coll Phys & Optoelect Engn, Adv Nucl Energy Res Team, Shenzhen 518060, Peoples R China
[ 3 ] [Yin, Yuan]Shenzhen Univ, Coll Phys & Optoelect Engn, Adv Nucl Energy Res Team, Shenzhen 518060, Peoples R China
[ 4 ] [Xiang, Congying]Fuzhou Univ, Coll Chem, State Key Lab Photocatalysis Energy & Environm, Fuzhou 350002, Peoples R China
[ 5 ] [Liang, Xiaocong]Fuzhou Univ, Coll Chem, State Key Lab Photocatalysis Energy & Environm, Fuzhou 350002, Peoples R China
[ 6 ] [Yu, Zhiyang]Fuzhou Univ, Coll Chem, State Key Lab Photocatalysis Energy & Environm, Fuzhou 350002, Peoples R China
[ 7 ] [Auger, Thierry]HESAM Univ, PIMM, Arts & Metiers ParisTech, CNRS,Cnam, 151 Blvd Hop, F-75013 Paris, France
[ 8 ] [Short, Michael P.]MIT, Dept Nucl Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA
[ 9 ] [Song, Min]Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China

Reprint 's Address：

喻志阳
[Gong, Xing]Shenzhen Univ, Coll Phys & Optoelect Engn, Adv Nucl Energy Res Team, Shenzhen 518060, Peoples R China;;[Yu, Zhiyang]Fuzhou Univ, Coll Chem, State Key Lab Photocatalysis Energy & Environm, Fuzhou 350002, Peoples R China

Email：

gongxing@szu.edu.cn |
yuzyemlab@gmail.com

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