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| 循环道次对高温叠轧AZ31镁合金板材组织与性能的影响 |
| Effects of Cyclic Passes on Micro-structure and Properties of AZ31 Magnesium Alloy Sheet Rolled at High Temperature |
| Received:April 20, 2019 Revised:May 10, 2019 |
| DOI：10.3969/j.issn.1674-6457.2019.03.013 |
| 中文关键词: AZ31镁合金 高温叠轧 循环道次 力学性能 |
| 英文关键词: AZ31magnesium alloy high temperature lap rolling cyclic pass mechanical property |
| 基金项目:国家自然科学基金（51301213，51501026，51701034）；重庆市基础与前沿研究计划(cstc2016jcyjA0452，cstc2017jcyjAX0775，cstc2017jcyjAX0062)；重庆市教委科学技术研究项目（KJ1600922，KJ1600924） |
| Author Name | Affiliation | | LYU Hu-yuan | Chongqing University of Technology, Chongqing 400054, China | | SONG Deng-hui | Chongqing University of Technology, Chongqing 400054, China | | ZHOU Tao | Chongqing University of Technology, Chongqing 400054, China | | SHI Lai-xin | Chongqing University of Technology, Chongqing 400054, China | | HU Li | Chongqing University of Technology, Chongqing 400054, China |
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| 中文摘要: |
| 目的 通过高温累积叠轧工艺制备出高强度的镁合金，并研究该过程中循环道次对AZ31镁合金板材的微观组织与性能的具体影响。方法 对累积叠轧1~5次板材进行微观组织观察，并进行显微硬度的测试，得到不同板材的硬度值，通过X射线衍射分析得到不同板材的取向结果，最终进行力学性能实验，并对比分析。结果 随着循环道次的增加，板材抗拉强度有明显改变。从260 MPa先增加至310 MPa，最后稳定在350 MPa左右；非基面织构比重增加；断裂伸长率先降低后升高并稳定在10%左右。结论 累积叠轧工艺使得AZ31镁合金板材产生了加工硬化，并显著细化了晶粒。循环道次的增加、孪晶产生和晶界数量显著增多导致强度进一步提高。 |
| 英文摘要: |
| The paper aims to prepare high strength magnesium alloys with the high temperature cumulative overlapping rolling process, and study the specific effect of the cyclic passes on the microstructure and properties of AZ31 magnesium alloy sheet. Microstructure observation and micro-hardness test were carried out on accumulative rolled sheets for 1~5 times to obtain the hardness of different sheets. Orientation results of different sheets were obtained by X-ray diffraction analysis. Finally, mechanical properties were tested and compared. It was found that the tensile strength of the sheet changed obviously from 260 MPa to 310 MPa with the increase of the cyclic passes, the final became stable at about 350 MPa. The proportion of non-base texture increased, and the fracture elongation decreased firstly, then increased and stabilized at about 10%. The cumulative overlapping rolling process leads to work hardening and remarkable grain refinement of AZ31 magnesium alloy sheet. The strength is further improved with the increase of cyclic passes, the generation of twin crystal and the remarkable increase of grain boundary. |
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