循环扩-挤变形AZ80镁合金组织与性能

发布时间：2018-06-09 22:42

本文选题：循环扩挤 + 镁合金　；参考：《稀有金属材料与工程》2017年07期

【摘要】：通过循环扩挤(CEEOP)变形方法对100 mm×50 mm×170 mm的AZ80镁合金块状材料进行挤压加工,借助计算机模拟仿真、组织观察、拉伸试验、硬度测试等手段研究了1~4道次CEEOP变形对AZ80镁合金等效应变、显微组织和力学性能的影响。结果表明:随着CEEOP挤压道次的增加,晶粒的尺寸越来越小且分布均匀,1道次后晶粒尺寸可以从200μm左右细化到6μm,4道次后晶粒尺寸细化到1.5μm左右,整体分布均匀呈等轴晶晶粒,晶粒细化的机制是晶粒的机械破碎和动态再结晶,2道次以后晶粒细化效果不太明显。力学性能较均匀化退火态有了大幅度的提升,1道次硬度HB从均匀化退火态的615 MPa提升到了830.7 MPa,4道次达到862.7 MPa,抗拉强度与屈服强度分别从均匀化退火态的230.9和115 MPa提升到了262.7和155 MPa,4道次可以达到294和170 MPa,通过对比ECAP变形试样的组织与力学性能数据,在相同的变形温度与累积应变下,CEEOP变形方法比ECAP变形能够更好地细化晶粒和提高材料的抗拉强度和屈服强度。
[Abstract]:The AZ80 magnesium alloy bulk material of 100mm 脳 50mm 脳 170mm was extruded by the method of cyclic extruding CEEOP.The computer simulation, microstructure observation and tensile test were used to process the AZ80 magnesium alloy bulk material. The effect of 1 ~ 4 pass CEEOP deformation on the equivalent strain, microstructure and mechanical properties of AZ80 magnesium alloy was studied by means of hardness test. The results show that with the increase of CEEOP extrusion pass, the grain size becomes smaller and smaller, and the grain size can be refined from 200 渭 m to 6 渭 m after passing 1 pass, and the grain size can be refined to about 1.5 渭 m after 4 passes, and the whole distribution is equiaxed grain. The mechanism of grain refinement is that the effect of grain refinement is not obvious after mechanical crushing and dynamic recrystallization. The mechanical properties of homogenized annealed state have been greatly improved from 615 MPA of homogenized annealing to 862.7 MPA of 4 passes of homogenization annealing. The tensile strength and yield strength of homogenized annealing state have been increased from 230.9 and 115MPa, respectively. It can reach 294 and 170MPa by raising to 262.7 and 155MPa. By comparing the microstructure and mechanical properties data of ECAP deformed specimen, Under the same deformation temperature and cumulative strain, the CEEOP method can refine the grain and improve the tensile strength and yield strength of the material better than that of the ECAP deformation.
【作者单位】：中北大学;
【基金】：山西省自然科学基金项目(2013011022-5)
【分类号】：TG146.22;TG379

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