Friction stir welding of carbon nanotubes reinforced Al-Cu-Mg alloy composite plates

doi:10.1016/j.jmst.2017.01.033

Abstract

Abstract:

Carbon nanotubes (CNTs) reinforced Al-Cu-Mg composite plates of 2.2 mm in thickness after extrusion and T4 treatment were joined by friction stir welding (FSW) and the joint efficiency reaches 87%. There was no precipitate in both heat-affected zone (HAZ) and nugget zone (NZ) as a medium rotation rate of 800 rpm and a relative high travel speed of 100 mm min^-1 were used. In the NZ, FSW disarranged the alignment of CNTs to random orientation and dispersed CNT uniformly. The orientation of CNTs perpendicular to the tensile direction and the possible dissolution of solute clusters made the HAZ become the weakest zone in the joint leading to the failure in the HAZ.

Key words: Carbon nanotubes, Metal matrix composites, Friction stir welding

Zhao Ke, Liu Zhenyu, Xiao Bolyu, Ma Zongyi. Friction stir welding of carbon nanotubes reinforced Al-Cu-Mg alloy composite plates[J]. J. Mater. Sci. Technol., 2017, 33(9): 1004-1008.

Figures/Tables 6

Fig. 1. Macrograph of FSW CNT/2009Al composite.

Table 1 Tensile properties of CNT/2009Al and the as-welded joint (YS: yield strength; EL: elongation).

Sample	YS (MPa)	UTS (MPa)	EL (%)
BM	610	630	1
Joint	500	550	1

Fig. 2. (a) Cross-sectional macrostructure, (b) micro-hardness profiles of FSW CNT/2009Al joint (Arrows corresponding to the fracture site in HAZ), and (c) macrostructure of failed joint after tension (RS: retreating side; AS: advancing side).

Fig. 3. TEM images showing CNT distribution in (a) BM, (b) HAZ and (c) NZ of FSW CNT/2009Al joint.

Fig. 4. Longitudinal (a) and cross-sectional (b) HRTEM images of CNTs in NZ.

Fig. 5. TEM (a, c, e) images and bright-field micrographs (b, d, f) of grains in BM (a, b), HAZ (c, d) and NZ (e, f) of FSW CNT/2009Al joint (The insets correspond to the SAED patterns of <100> zone axis of BM, HAZ and NZ, respectively).

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