Effect of lubrication on deformation characteristics of a superplastic 5083 Al alloy during bi-axial deformation

✍ Scribed by Horng-Yu Wu; Chui-Hung Chiu; Jiann-Yih Wang; Shyong Lee

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 510 KB
• Volume: 427
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.04.102

✦ Synopsis

Effect of lubrication on deformation behavior of a superplastic material has relatively been less examined, though it is important for industrial application. In this paper, a superplastic 5083 Al alloy under bi-axial deformation was investigated by deforming the sheet into a rectangular die cavity with and without lubrication. It was found that reducing the interfacial friction by use of a lubricant altered the metal flow after the deformed sheet had made contact with the die surface. Changes of the metal flow during forming not only developed a better thickness distribution of the formed part, but also improved cavitation distribution. The cavitation levels could be effectively reduced for forming with lubrication at a higher strain rate; the maximum cavity volume fraction decreased from 6.75 to 3.33% for forming at a strain rate of 1 × 10 -3 s -1 .