Mg-5Zn-1Mn-0.6Sn镁合金板材光纤激光焊接头的显微组织及液化行为

Mg-5Zn-1Mn-0.6Sn镁合金板材光纤激光焊接头的显微组织及液化行为

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Bibliographic Details
Published in:中国有色金属学报：英文版 Vol. 27; no. 4; pp. 812 - 819
Main Author: 佘庆元;严红革;陈吉华;苏斌;俞照辉;陈潮;夏伟军
Format: Journal Article
Language:English
Published: 2017
Subjects:
镁合金薄板;光纤激光焊;显微组织;液化现象;液化机理
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Description
Bibliography:43-1239/TG
Fine-grained Mg?5Zn?1Mn?0.6Sn alloy sheets of2mm in thickness were welded by fiber laser welding.The appearanceand microstructures of the welding joints and liquation behaviors in the partially melted zone(PMZ)were investigated.The resultsshow that,with the lower welding power and higher welding speed,the width and depth of the joints decrease.Moreover,some poresare detected at a very high welding speed.There are two kinds of liquation phenomena in the PMZ.One is the liquation networkalong grain boundaries associated with the liquation of substrate and segregation-induced liquation,the other is the molten poolinvolved with the liquation of the residual second phases at the boundaries.However,the liquation of substrate and thesegregation-induced liquation are the main liquation mechanism in the PMZ.
magnesium alloy sheet; fiber laser welding; microstructure; liquation phenomenon; liquation mechanism
ISSN:1003-6326