铝合金/镁合金搅拌摩擦焊接界面处Mg/Al反应及接头力学性能
收稿日期: 2009-12-01
修回日期: 2010-03-01
网络出版日期: 2010-05-11
基金资助
国家杰出青年科学基金项目50525103及中国科学院百人计划研究项目资助
Mg/Al REACTION AND MECHANICAL PROPERTIES OF Al ALLOY/Mg ALLOY FRICTION STIR WELDING JOINTS
Received date: 2009-12-01
Revised date: 2010-03-01
Online published: 2010-05-11
Supported by
Supported by National Outstanding Young Scientist Foundation (No.50525103) and Hundred Talents Program of Chinese Academy of Sciences
采用搅拌针置中(M4A4)、向镁合金侧偏置2 mm (M6A2)和向铝合金侧偏置2 mm (A6M2) 3种焊接方式, 研究了6 mm厚6061--T651铝合金和AZ31镁合金轧制板材的搅拌摩擦焊接. SEM及XRD分析表明, 3种焊接方式均在焊接界面处发现Mg17Al12相的生成和由于共晶相熔化和随后冷却所形成的孔洞. 在M4A4和M6A2样品中, 少量的Al搅入到镁合金侧形成金属间化合物Mg17Al12, 而在A6M2样品中, 少量的Mg搅入到铝合金中也形成金属间化合物Mg17Al12, 在Mg17Al12与基体的界面处存在微小孔洞. 由于焊核区仅有少量的Mg17Al12生成, 其硬度变化并不显著. 焊接界面处生成的金属间化合物及孔洞显著降低接头的拉伸性能.
王东 , 刘杰 , 肖伯律 , 马宗义 . 铝合金/镁合金搅拌摩擦焊接界面处Mg/Al反应及接头力学性能[J]. 金属学报, 2010 , 46(5) : 589 -594 . DOI: 10.3724/SP.J.1037.2009.00802
Mg alloys are increasingly used in aerospace, aircraft and automotives structures due to the low density and good damping properties, especially, the welding of Mg alloy to Al alloys is of practical importance for widening the application of Mg alloys. Although friction stir welding (FSW) has been used to join Mg and Al alloys, defect free joints are achieved only in the thin plate (less than 4 mm). In this paper, three ways of FSW of 6 mm thick 6061--T651 Al alloy and AZ31 Mg alloy plates, offsetting the pin to the seam between the two plates (M4A4), to the Mg alloy side 2 mm (M6A2) and to the Al alloy side 2 mm (A6M2), were studied. The aim is to examine the effects of the relative position between tool and plate on the microstructure and mechanical properties of FSW Mg/Al alloys joint. SEM and XRD analyses revealed the formations of intermetallics Mg17Al12 and voids in the interface between Mg and Al alloy plates in the three FSW samples. The voids are resulted from the melting and subsequent solidification of eutectic. In the M4A4 and M6A2 samples, some Al are stirred into the Mg alloy side during FSW, forming the Mg17Al12, whereas in the A6M2 sample, some Mg stirred into the Al alloy side are also transformed to the Mg17Al12. Some fine pores are observed around the Mg17Al12. The hardness of the nugget zone exhibits a slight increase due to the formation of a small amount of Mg17Al12. The intermetallics and pores at the jointed interface decrease the strength of the joints significantly.
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