Microstructure and Mechanical Property of Al5083 Alloy Produced by Spray Forming and Hot Extrusion

초록

The microstructure and mechanical Property of Al5083 Alloy produced by Spray forming and then subsequent hot extrusion at 693K were investigated. In oder to compare the mechanical property and microstructure permanent casting and hot extrusion was also carried out in air. The spray formed Al 5083 alloy showed the microstructure consisting of Al matrix phase, MnAl6, FeAl6 and Mg2Al3 dispersoids. This microstructural feature analyzed is quite similar to Al5083 alloy prepared by conventional casting. However, a noticeable difference in grain size appeared between those alloys with different processing. It is found that spray forming plays an effective role to reduce the grain size of the present Al5083 alloy. At room temperature, the yield strength of spray formed alloy was higher than that of permanent casting alloy. At higher temperature, spray forming appeared to display a higher elongation value than conventional casting. It is therefore suggested that spray forming of the present Al5083 alloy promotes to increase elongation at high temperature. Detail will be discussed in relation with the results obtained.