Abstract
The present patent is to choose the most popular and low-priced commercial AZ91D ingot, and to apply the most simple and feasible one- or two-step extrusion method, resulting in superior low temperature superplasticity. The one-step extrusion is undertaken using a high extrusion ratio above 100:1 (better above 150:1) at 250-350 DEG C. And the two-step extrusion is conducted with an extrusion ratio of 20:1 to 50:1 for the first step at 250-350 DEG C, followed by a second-step extrusion with an extrusion ratio of 3:1 to 8:1 at 200-300 DEG C (~50 DEG C below the first step). The grain size after high extrusion ratio extrusion is ~1 mum, resulting in high low temperature superplastic elongation of ~1200% at 300 DEG C and 1x10 s .
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