(湖南大學(xué)材料科學(xué)與工程學(xué)院， 長沙 410082)
摘 要: 采用等徑角軋制工藝制備了AZ31鎂合金板材。 結(jié)果表明： 經(jīng)等徑角軋制后的板材， 晶粒取向由等徑角軋制前的(0002)基面取向演化為基面與非基面共存的取向。 與等徑角軋制前的板材相比， 板材晶粒尺寸略有長大并有孿晶出現(xiàn)， 但強(qiáng)度卻明顯提高， 而斷裂延伸率變化不大， 尤其是1個道次軋制的板材其抗拉強(qiáng)度由等徑角軋制前的240增大到275 MPa， 屈服強(qiáng)度由193.8增大到239.2 MPa； 隨著等徑角軋制道次的增加， 板材的強(qiáng)度逐漸降低， 至第4個道次其抗拉強(qiáng)度僅為250 MPa， 屈服強(qiáng)度為207.3 MPa。
關(guān)鍵字: AZ31鎂合金板材； 等徑角軋制； 晶粒取向； 顯微組織；力學(xué)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
