TY - GEN
T1 - Effects of process parameters on the evolving properties of dissimilar aluminium-copper friction stir welds
AU - Akinlabi, Esther T.
AU - Akinlabi, Stephen A.
PY - 2013
Y1 - 2013
N2 - This paper reports the effect of processing parameters on the evolving properties of friction stir joints between 5754 Aluminium Alloy and C11000 Copper. The welds were produced by varying the rotational speed between 600 and 1200 rpm and the traverse speed varied between 50 and 300 mm/min. The welds were characterized through microstructure, microhardness, tensile testing and electrical resistivity. The weld cross sections revealed that good mixing of both materials joined was better achieved at the low traverse speed of 50 mm/min. It was observed that the Ultimate Tensile Strength (UTS) of the welds decreases as the welding speed increases due to better material flow and transport of materials during the welding process at low travel speeds. Higher Vickers microhardness values were measured in the Thermomechanically Affected Zones (TMAZ) and the Stir Zones (SZ) due to plastic deformation that has occurred during the welding process and also due to the presence of intermetallic compounds at the interface. These higher Vickers microhardness values were observed mostly in welds produced at 50 and 150 mm/min, welds produced at 300 mm/min have a fairly flat profile due to low heat input into these welds. At constant rotational speeds, it was observed that the joint electrical resistivities of the welds increases as the traverse speed decreases due to the heat input to the welds.
AB - This paper reports the effect of processing parameters on the evolving properties of friction stir joints between 5754 Aluminium Alloy and C11000 Copper. The welds were produced by varying the rotational speed between 600 and 1200 rpm and the traverse speed varied between 50 and 300 mm/min. The welds were characterized through microstructure, microhardness, tensile testing and electrical resistivity. The weld cross sections revealed that good mixing of both materials joined was better achieved at the low traverse speed of 50 mm/min. It was observed that the Ultimate Tensile Strength (UTS) of the welds decreases as the welding speed increases due to better material flow and transport of materials during the welding process at low travel speeds. Higher Vickers microhardness values were measured in the Thermomechanically Affected Zones (TMAZ) and the Stir Zones (SZ) due to plastic deformation that has occurred during the welding process and also due to the presence of intermetallic compounds at the interface. These higher Vickers microhardness values were observed mostly in welds produced at 50 and 150 mm/min, welds produced at 300 mm/min have a fairly flat profile due to low heat input into these welds. At constant rotational speeds, it was observed that the joint electrical resistivities of the welds increases as the traverse speed decreases due to the heat input to the welds.
KW - Aluminium alloy
KW - Copper
KW - Electrical resistivity
KW - Friction stir welding and microstructural characterisation
UR - http://www.scopus.com/inward/record.url?scp=84880649051&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84880649051
SN - 9781627089982
T3 - ASM Proceedings of the International Conference: Trends in Welding Research
SP - 695
EP - 699
BT - Trends in Welding Research - Proceedings of the 9th International Conference
T2 - 9th International Conference on Trends in Welding Research
Y2 - 4 June 2012 through 8 June 2012
ER -