Superplastic properties of Pb–62%Sn eutectic alloy after equal channel angular pressing (ECAP)

✍ Scribed by Sangmok Lee

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 736 KB
• Volume: 201
• Category: Article
• ISSN: 0924-0136
• DOI: 10.1016/j.jmatprotec.2007.11.153

✦ Synopsis

Billets of Pb-62%Sn alloy were subjected to equal channel angular pressing up to various numbers of pressings of 1, 4, 8 and 16 passes via route B C at room temperature in order to investigate its superplastic properties. These samples were pulled to failure in an Instron machine at a temperature of 413 K at initial strain rates ranging from 1.0 × 10 -3 s -1 to 2.0 × 10 -2 s -1 . The initial grain size was ∼14 m and the grain sizes corresponding to 1, 4 and 8 passes were 10.7, 9.2 and 8.4 m, respectively. At a strain rate of 1.0 × 10 -3 s -1 , which is rather close to the optimum superplastic region II in this material, for 8 passes the elongation to failure increased from 2330 to 3000%, which can be considered to be optimum number of pass for attaining highest ductility.