(1. 重慶大學 機械傳動國家重點實驗室，材料科學與工程學院，重慶 400044；
2. 重慶大學 國家鎂合金工程技術(shù)研究中心，材料科學與工程學院，重慶 400044；
3. 重慶先進材料研究中心，重慶科學技術(shù)研究院，重慶 401123)
摘 要: 研究微量(0.2%，質(zhì)量分數(shù))Ce和Ca對AZ31合金組織演變和成形性能的影響，期望通過改善組織和織構(gòu)開發(fā)低成本高成形性能的鎂合金。結(jié)果表明：Ce和Ca可以使擠壓態(tài)AZ31板材再結(jié)晶晶粒更加均勻細小；Ce和Ca可以弱化軋制退火態(tài)板材的基面織構(gòu)，Ca會使AZ31板材的基面織構(gòu)基極向橫向發(fā)散，同時，Ce和Ca還能使AZ31板材的r值和各向異性降低；Ce和Ca可以大幅提高AZ31合金板材的室溫成形性能，Mg-3Al-1Zn-0.2Ce-0.2Ca合金薄板的基面織構(gòu)強度為3.2，r值為1.05，Δr值為0.04，其Erichsen值達到6.0 mm。織構(gòu)的改善主要是由于合金元素引起的滑移系的改變，板材各向異性的降低與其織構(gòu)的改善密切相關(guān)，室溫成形性能的提高可以歸因于織構(gòu)的改善、較小的r值和較大的n值。
關(guān)鍵字: 鎂合金；組織演變；成形性能；織構(gòu)；微合金化
（1. State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2. National Engineering Research Center for Magnesium Alloys，Chongqing University, Chongqing 400044, China;
3. Chongqing Research Center for Advanced Materials, Chongqing Academy of Science & Technology, Chongqing 401123, China）
Abstract:The effects of trace (0.2%, mass fraction) Ce and Ca on microstructure evolution and formability of AZ31 alloys were investigated desiring to develop low-cost and high-formability magnesium alloys by improving the microstructure and texture. The results reveal that Ce and Ca can make the recrystallize grains of the extruded AZ31 sheets more uniform and smaller. Ce and Ca can weaken the basal texture of the rolled and annealed sheet, Ca can cause the basal pole of AZ31 sheets to spread towards TD, Ce and Ca also decrease the r value and anisotropy of AZ31 sheets. Ce and Ca greatly improve the room temperature formability of AZ31 alloy sheets, the basal texture of Mg-3Al-1Zn-0.2Ce-0.2Ca sheets is 3.2, r value is 1.05, Δ r value is 0.04, and its Erichsen value is 6.0 mm. The modified texture is mainly due to the change of the slip systems caused by the alloying elements, the reduction of sheet anisotropy is closely related to the modified texture, and the improvements at room temperature formability of the alloys can be attributed to the modified texture, smaller r values and larger n values.
Key words: magnesium alloy; microstructure evolution; formability; texture; microalloying
