Abstract
Multi-pass hot rolling can help overcome the poor formability of high-strength Mg-Gd-Y alloys at ambient and intermedium temperature. It is essential to explore deformation characteristics of the alloys under such discontinuous thermomechanical processing. In the current work, double-pass isothermal compression tests were carried out to study the flow behavior and formability of a hot-rolled Mg-8Gd-3Y alloy at the temperature range of 350–450 °C with a strain rate range of 0.001–0.1 s−1. Two kinds of hardening behavior characterized by higher second-pass peak stress than the first-pass unloading stress are discovered. One is caused by precipitation that occurs during holding at a temperature range of 350–400 °C under a strain rate of 0.1 s−1. The other is grain-growth-induced hardening and takes place at 450 °C with a strain rate range of 0.01–0.1 s−1. Based on the dynamic material model, three-dimensional power dissipation and instability maps were established, corroborating improved formability under double-pass isothermal compression. The results clarify that employing inter-pass holding during hot working can widen the suitable processing window and reduce deformation bands.
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