Microstructural aspects in Al-Cu dissimilar joining by FSW

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作   者：

Carlone, Pierpaolo;  Astarita, Antonello;  Palazzo, Gaetano S.;  Paradiso, Valentino;  Squillace, Antonino; 

作者机构：

Dept Ind Engn;  Dept Chem Mat & Ind Prod Engn;  SA;  Univ Salerno;  I-80100 Naples;  Univ Naples Federico II;  Italy;  I-84084 Fisciano; 

关键词：

Cu10100;  Dissimilar joint;  EDS;  Friction stir welding;  AA2024-T3;  Microstructure; 

期刊名称：

The International Journal of Advanced Manufacturing Technology

i s s n：

0268-3768

年卷期：

2015 年 79 卷 5/8 期

页   码：

1109-1116

页   码：

摘   要：

Sound AA2024-T3-Cu10100 dissimilar joints were obtained by friction stir welding offsetting the tool probe towards the aluminum sheet and employing selected processing parameters. Joint microstructure was analyzed by means of conventional optic microscopy as well as scanning electron microscopy. The weld bead exhibited welding zones and some features typically encountered in similar FSW. The nugget zone consisted of a mixture of recrystallized aluminum matrix and deformed and twinned copper particles. Onion rings and particle-rich zones, made of Cu particles dispersed in the Al matrix, were also observed. EDS analysis revealed that several Al-Cu intermetallic compounds, such as Al2Cu, AlCu, and Al3Cu4, chemically different w.r.t. compounds precipitated during the T3 aging treatment (Al3Cu), were formed during the process. Microstructure variation significantly affects the microhardness distribution in the cross-section of the joint.