CAJ | 학술논문

在300℃将d 50 mm的铸态Mg-6Zn-1Y-1Ce合金挤压成d 14 mm、d 12 mm和d 10 mm的棒材，使用X射线衍射、光学显微镜、扫描电镜和透射电镜分析合金组织，测试其室温拉伸性能。结果表明：合金再结晶组织与挤压比相关，挤压比越大，再结晶越充分；d 14 mm、d 12 mm和d 10 mm试样的再结晶面积分数分别为69.0%、85.8%和99.1%，平均晶粒尺寸分别为2.7、2.9和5.9μm，屈服强度分别为327.4、286.5和237.5 MPa。合金的高强度归因于合金化和细晶强化的综合作用。
재300℃장d 50 mm적주태Mg-6Zn-1Y-1Ce합금제압성d 14 mm、d 12 mm화d 10 mm적봉재，사용X사선연사、광학현미경、소묘전경화투사전경분석합금조직，측시기실온랍신성능。결과표명：합금재결정조직여제압비상관，제압비월대，재결정월충분；d 14 mm、d 12 mm화d 10 mm시양적재결정면적분수분별위69.0%、85.8%화99.1%，평균정립척촌분별위2.7、2.9화5.9μm，굴복강도분별위327.4、286.5화237.5 MPa。합금적고강도귀인우합금화화세정강화적종합작용。
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 5.9μm, 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.