(1. 河南理工大學(xué) 材料科學(xué)與工程學(xué)院，焦作 454000；
2. 河南理工大學(xué) 經(jīng)濟(jì)管理學(xué)院，焦作 454000)
摘 要: 在300 ℃將d 50 mm的鑄態(tài)Mg-6Zn-1Y-1Ce合金擠壓成d 14 mm、d 12 mm和d 10 mm的棒材，使用X射線衍射、光學(xué)顯微鏡、掃描電鏡和透射電鏡分析合金組織，測(cè)試其室溫拉伸性能。結(jié)果表明：合金再結(jié)晶組織與擠壓比相關(guān)，擠壓比越大，再結(jié)晶越充分；d 14 mm、d 12 mm和d 10 mm試樣的再結(jié)晶面積分?jǐn)?shù)分別為69.0%、85.8%和99.1%，平均晶粒尺寸分別為2.7、2.9和5.9 μm，屈服強(qiáng)度分別為327.4、286.5和237.5 MPa。合金的高強(qiáng)度歸因于合金化和細(xì)晶強(qiáng)化的綜合作用。
關(guān)鍵字: 鎂合金；擠壓比；組織；拉伸性能
（1. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;
2. School of Economic and Management, Henan Polytechnic University, Jiaozuo 454000, China）
Abstract:Mg-6Zn-1Y-1Ce alloy bars with diameters of 14 mm, 12 mm and 10 mm were prepared by extrusion from as-cast ingots with diameter of 50 mm at 300 ℃. The microstructures were examined by XRD, OM, SEM and TEM, and the tensile properties were tested at room temperature. The results show that the recrystallization microstructure of as-extruded alloys correlates to the extrusion ratio. The recrystallized area fractions for bars of d 14 mm, d 12 mm and d 10 mm are 69.0%, 85.8% and 99.1%, respectively. The mean grain sizes are 2.7, 2.9 and 5.9 μm, respectively. The yield strengths are 327.4, 286.5 and 237.5 MPa, respectively. The high strengths are attributed to the combined action of alloying and fine-grain strengthening mechanism.
Key words: magnesium alloy; extrusion ratio; microstructure; tensile properties
