研究了变形Mg-1.5Zn-0.2Gd合金在热轧和退火过程中的显微组织、织构以及室温成形性能.结果表明:Mg-1.5Zn-0.2Gd合金经过热轧、退火后,其织构得到明显弱化并且沿着TD方向发生分裂,使得合金在室温下具有较高的断后伸长率和成形能力.450℃热轧后合金的基面织构强度最大值为3.4,RD方向上伸长率仅为6.7％;然而,合金经过350℃/60min退火后基面织构强度明显降低,最大值仅为2.3,并且基面织构沿着TD方向发生分裂,RD方向上伸长率达到26.7％.EBSD研究表明,稀土Gd元素溶入合金中,阻碍了热轧过程中动态再结晶的发生,在随后的退火过程中,非基面取向晶粒在原始大角度晶界位置形核长大,这是Mg-1.5Zn-0.2Gd合金织构得到优化的关键原因.
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