In this paper, the effect of Ni (0, 0.5 and 1.0 wt%) additions on the microstructure, mechanical properties and electrical conductivity of cast and extruded Al-MM-Sb alloy is studied using field emission scanning electron microscopy, and a universal tensile testing machine. Molten aluminum alloy is maintained at 750 oC and then poured into a mold at 200 oC. Aluminum alloys are hot-extruded into a rod that is 12 mm in diameter with a reduction ratio of 39:1 at 550 oC. The addition of Ni results in the formation of Al11RE3, AlSb and Al3Ni intermetallic compounds; the area fraction of these intermetallic compounds increases with increasing Ni contents. As the amount of Ni increases, the average grain sizes of the extruded Al alloy decrease to 1359, 536, and 153 μm, and the high-angle grain boundary fractions increase to 8, 20, and 34 %. As the Ni content increases from 0 to 1.0 wt%, the electrical conductivity is not significantly different, with values from 57.4 to 57.1 % IACS.

1. Introduction
2. Experimental Procedure
3. Results and Discussion
4. Conclusion
References

• Hyo-Sang Yoo(Korea Institute of Industrial Technology, Republic of Korea)
• Yong-Ho Kim(Korea Institute of Industrial Technology, Republic of Korea)
• Cheol-Woo Kim(Korea Institute of Industrial Technology, Republic of Korea)
• Se-Weon Choi(Korea Institute of Industrial Technology, Republic of Korea)
• Hyeon-Taek Son(Korea Institute of Industrial Technology, Republic of Korea) Corresponding author