Microstructure investigation of Nd:YAG laser welded 5A90 aluminium-lithium alloys - 文章详情页

作者：

Cui, Li (Cui, Li.) (学者：崔丽) | Li, Xiaoyan (Li, Xiaoyan.) | He, Dingyong (He, Dingyong.) (学者：贺定勇) | Chen, Li (Chen, Li.) | Gong, Shuili (Gong, Shuili.)

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摘要：

Nd:YAG　laser　welding　of　5A90　aluminium-lithium(Al-Li)　alloy　thin　sheets　has　been　carried　out.　Microhardness　tests　across　the　transverse　section　of　the　weld　were　performed.　The　influence　of　laser　welding　on　the　microstructure　of　5A90　aluminium-lithium　alloy　at　different　sections　has　been　evaluated　by　optical　microscope,　SEM　and　TEM.　Microhardness　tests　revealed　that　the　laser　weld　had　lower　microhardness　than　that　of　base　metal.　Laser　welds　revealed　the　formation　and　presence　of　a　zone　of　equiaxed　grains　(EQZ)　along　the　fusion　boundary.　The　major　strengthening　phase　in　5A90　aluminium-lithium　alloy　was　δ′　phase　particles.　The　presence　of　the　δ′　precipitates　in　the　welds　was　proved　by　the　LI2　superlattice　reflections　in　diffraction　patterns,　but　the　volume　of　the　δ′　precipitates　in　the　weld　zone　was　very　little,　which　attributed　to　the　decrease　in　the　microhardness　of　the　weld　compared　with　the　base　metal.

关键词：

Aluminum alloys Hardness testing Laser beam welding Lithium alloys Microhardness Microstructure Neodymium lasers Textures Welds Yttrium aluminum garnet

作者机构：

[ 1 ] [Cui, Li]College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
[ 2 ] [Li, Xiaoyan]College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
[ 3 ] [He, Dingyong]College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
[ 4 ] [Chen, Li]High Energy Density Beam Processing Technology Department, Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China
[ 5 ] [Gong, Shuili]High Energy Density Beam Processing Technology Department, Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China

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电子邮件地址：

cuili@bjut.edu.cn

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