轧制温度对Mg-2Zn-xY合金微观组织的影响

Effect of Rolling Temperature on Microstructure of Y-microalloyed Mg-2Zn Magnesium Alloy

通过改变在部分道次大压下率轧制时粗轧及精轧的轧制温度,研究了轧制温度对轧制Mg-2Zn-xY镁合金微观组织的影响,还研究了Y含量对合金组织的作用。结果表明,在部分大压下率粗轧后,合金组织发生了再结晶,且均为等轴晶组织。随着轧制温度的提高,平均晶粒显著增大,并以300℃粗轧时最佳。精轧温度不宜过高或过低,在350℃左右精轧能有效抑制孪晶组织的产生,获得较均匀的微观组织。不同Y含量的Mg-2Zn-xY合金的轧后晶粒尺寸与轧制工艺有关。

Effects of rolling temperature and Y content on microstructure of Y-microalloyed Mg-2Zn magnesium alloy were investigated through adjusting initial rolling and final rolling temperature at part of large reduction.The results show that the recrystallization can be observed in the alloy after part of large reduction initial rolling,and the grain almost exhibits full equiaxed grain.In addition,with the increase of rolling temperature,average grain size in the alloy is increased significantly,and the 300℃initial rolling temperature is satisfied.Final rolling temperature should not be too higher or too lower,and it could restrain effectively the twin crystal at 350℃,obtaining homogeneous microstructure.The grain size of magnesium alloy with different Y content is related with rolling system.