The characteristics of aluminum–scandium alloys processed by ECAP

✍ Scribed by K. Venkateswarlu; V. Rajinikanth; Ajoy Kumar Ray; Cheng Xu; Terence G. Langdon

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 851 KB
• Volume: 527
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2009.10.047

✦ Synopsis

Aluminum-scandium alloys were prepared having different scandium additions of 0.2, 1.0 and 2.0 wt.% and these alloys were processed by equal-channel angular pressing (ECAP) at 473 K. The results show the grain refinement of the aluminum matrix and the morphology of the Al 3 Sc precipitates depends strongly on the scandium concentration. The tensile properties were evaluated after ECAP by pulling to failure at initial strain rates from 1.0 × 10 -3 to 1.0 × 10 -1 s -1 . The Al-1% Sc alloy exhibited the highest tensile strength of ∼250 MPa at a strain rate of 1.0 × 10 -1 s -1 . This alloy also exhibited a superior grain refinement of ∼0.4 m after ECAP where this is attributed to a smaller initial grain size and an optimum volume fraction of dispersed Al 3 Sc precipitates having both micrometer and nanometer sizes.