| 薛勇,吴耀金,杨治辉,张治民.循环扩挤变形AZ80镁合金的组织、织构与力学性能[J].材料导报,2017,31(16):55-59 |
| 循环扩挤变形AZ80镁合金的组织、织构与力学性能 |
| Microstructure,Texture and Mechanical Properties of AZ80 Magnesium Alloy Processed by Cyclic Expansion-extrusion |
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| DOI：10.11896/j.issn.1005-023X.2017.016.012 |
| 中文关键词: 循环扩挤 AZ80镁合金 织构 |
| 英文关键词: cyclic expansion-extrusion, AZ80 magnesium alloy, texture |
| 基金项目:山西省自然科学基金(2013011022-5) |
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| 摘要点击次数: 3158 |
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| 中文摘要: |
| 采用循环扩挤(Cyclic expansion-extrusion, CEE)变形工艺对AZ80镁合金的块状材料进行热挤压加工,观察试样的微观组织与织构,并测试了力学性能。结果表明:AZ80镁合金经过CEE变形后,晶粒的尺寸明显细化,第4道次CEE变形之后,晶粒尺寸从150～230 μm细化至2 μm,整体分布均匀且呈等轴晶；2道次变形后,随着挤压道次的增加,晶粒的细化程度减慢；同时经过CEE变形的AZ80镁合金织构包括了(0001)基面平行于挤压方向与(1120)棱柱面垂直于挤压方向的两种不同纤维织构,随着挤压道次的增加,织构总体强度出现先减后增再减的变化；力学性能相对于均匀化态有着明显的变化,第1道次CEE变形之后,抗拉强度与屈服强度分别达到各自的最大值,为290 MPa和180 MPa,第2道次CEE变形之后,强度出现不随晶粒细化而增强的现象(反Hall-Petch理论),这是因为织构的软化作用强于晶粒的细化作用,而伸长率随着挤压道次的增加而提高。 |
| 英文摘要: |
| The CEE deformation process was conducted on AZ80. The microstructure and texture were observed and the mechanical properties were measured.The results showed that the grain size has been significantly refined after CEE deformation. After four-pass, the grain size refined from 150-230 μm to 2 μm, and the grains presented equiaxied and uniform. After two-pass, with the increase of passes, the degree of grain refinement reduced slowly. Simultaneously, after CEE, AZ80 magnesium alloy texture consisted of two different fiber texture:(0001) plane paralleled to the extrusion direction and (1120) prism which is perpendicular to the compression direction. With the increase of extrusion passes, the overall intensity of texture decreased firstly, then increased and finally decreased. Compared with the homogeneous state, the mechanical properties has obvious various. After one-pass CEE deformation, the tensile strength and yield strength reach the maximum value, and the value was 290 MPa and 180 MPa, respectively. After two-pass of CEE deformation, the strength is not enhanced with grain refinement (anti Hall-Petch theory). This is because the softening effect of texture is stronger than that of grain refinement. The elongation increases with the increase of extrusion passes. |
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