Development of high-speed superplastic Al alloy by the MA process using Alfoil

Recently, it has been found that some mechanically alloyed (MA) aluminum al loys exhibit superplasticity at higher strain rates of more than 1 s(-1). I n general, metallic powders are used as raw materials in the development of superplastic alloys by the MA methods. Powder material is generally more e xpensive than ingot material MA by vibratory ball mill was conducted using comparatively cheap Al foil material under various milling time conditions. The properties of the MA materials were investigated by tensile tests in s everal strain rates. As a result, high-speed superplastic material was obta ined in a quarter of the milling time and at 16% of the cost required to de velop the same qualities using Al powder. (C) 2001 Elsevier Science B.V. Al l rights reserved.