Effect of platform temperature on microstructure and corrosion resistance of selective laser melted Al-Mg-Sc alloy plate

Abstract

The Al-3.40Mg-1.08Sc alloy plates were manufactured by selective laser melting (SLM) at platform temperatures of 35 °C and 200 °C, respectively, and the corrosion performance of them was studied along height direction. The results show that the corrosion resistance of the alloy plate built at platform temperature of 35 °C along height direction is basically the same due to a uniform microstructure; While the corrosion resistance of the alloy plate built at platform temperature of 200 °C along height direction is different. The evolution of microstructure and the distribution of secondary phases are investigated, and the results show that the Cu-rich phases in alloy play a key role on corrosion performance. At higher platform temperature, the cooling rate is relative slow and a certain degree of in situ ageing leads to the significantly different distribution of Cu-rich phases along grain boundary. Specimens built at the platform temperature of 200 °C are inclined to locate at the crossed grain boundary, rather than continuous segregation of Cu-rich phases along grain boundary that is built at platform temperature of 35 °C. Therefore, the corrosion resistance of Al-3.40Mg-1.08Sc alloy plate manufactured at platform temperature of 200 °C is higher, and presents a gradually decreasing trend along height direction.

Keywords

selective laser melting / aluminum alloys / microstructure / corrosion resistance / platform temperature

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