(湖南大学材料科学与工程学院， 长沙 410082)
摘 要: 采用等径角轧制工艺制备了AZ31镁合金板材。 结果表明： 经等径角轧制后的板材， 晶粒取向由等径角轧制前的(0002)基面取向演化为基面与非基面共存的取向。 与等径角轧制前的板材相比， 板材晶粒尺寸略有长大并有孪晶出现， 但强度却明显提高， 而断裂延伸率变化不大， 尤其是1个道次轧制的板材其抗拉强度由等径角轧制前的240增大到275 MPa， 屈服强度由193.8增大到239.2 MPa； 随着等径角轧制道次的增加， 板材的强度逐渐降低， 至第4个道次其抗拉强度仅为250 MPa， 屈服强度为207.3 MPa。
关键字: AZ31镁合金板材； 等径角轧制； 晶粒取向； 显微组织；力学性能
（ College of Materials Science and Engineering, Hunan University,
Changsha 410082, China）
Abstract: AZ31 magnesium alloy sheet were prepared by equal channel angular rolling (ECAR). It is found that the orientation of the sheet processed by ECAR is changed and the crystal orientation evolves from (0002) basal plane orientation to coexistence of basal plane and non-basal plane. Compared with as-received sheet, the grain size increases slightly and twins are presented. The strength of the sheets after ECAR is improved evidently, and the elongation to failure is varied lightly, especially processed by 1 passed whose ultimate tensile strength increases from 240 to 275 MPa and the yield strength increases from 193.8 to 239.2 MPa. And the strength decreases gradually with the increasing pass numbers. The ultimate tensile strength of 4 passed sheet is 250 MPa and the yield strength is 207.3 MPa.
Key words: AZ31 magnesium alloy sheet; equal channel angular rolling; crystal orientation; microstructures; mechanical properties
