摘要
The severe cold rolling was employed to enhance strength of Mg-3Gd-lZn （mass fraction, %） alloy sheet. The 0.2% yield stress of the Mg-3Gd-1Zn hot-rolled sheet can be increased by 150% through the single-pass cold rolling with the reduction of 23%, due to the high intensity of dislocation and basal texture established during cold rolling. Compared with the Mg-3Gd-lZn hot-rolled sheet, the cold-rolled sheet annealed at 350 for 30 min may get an enhancement in strength without a great loss of ductility. The sheet processed by multi-pass cold rolling does not show a higher strength as expected, due to the softening effect of shear bands. However, the thin slab with the thickness less than 1 mm can be produced by the multi-pass cold rolling with the annealing treatment as few as possible.
利用大应变冷轧提高Mg3Gd1Zn(质量分数)合金的强度。通过单道次23%压下量的冷轧处理,可在Mg3GdZn合金热轧板材的组织中引入大量位错,使其形成基面织构,进而使其屈服强度提高150%。与Mg3GdZn合金热轧板材相比,将冷轧板材在350°C下退火30min,可以提高其强度,同时具有较高的塑性。由于剪切带的软化作用,多道次冷轧的Mg3Gd1Zn合金板材没有获得预期的强度;但是,利用多道次冷轧来制备厚度小于1mm的薄板或箔材,可以尽可能减少道次间的回炉退火,从而提高生产效率,降低能耗。
基金
Project (2013CB632202) supported by the National Basic Research Program of China
Project (51105350) supported by the National Natural Science Foundation of China
