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| 挤压态Mg–9Al–Zn–0.5RE–Ca–Si合金微观组织和力学性能 |
| #$NPMicrostructure and Mechanical Properties of as-Extruded Mg-9Al-Zn-0.5RE-Ca-Si Alloy |
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| DOI：10.3969/j.issn.1674-6457.2023.05.004 |
| 中文关键词: 稀土镁合金 挤压 背散射电子衍射 沉淀强化 耐热性 |
| 英文关键词: rare earth magnesium alloy extrusion electron backscattered diffraction precipitation strengthening heat resistance |
| 基金项目:国家自然科学基金(51901149);国家重点研发计划(2020YFE0204500);中国科学院赣江创新研究院自主部署项目(E055B003);长春市科技发展计划(21GD03);中国科学院重点部署项目(ZDRW–CN–2021–3–4–15);山西省青年科技研究基金(201901D211307);山西省高等学校科技创新项目(019L0625) |
| Author Name | Affiliation | | ZANG Lan-lan | CRRC Dalian Rolling Stock Co., Ltd., Liaoning Dalian 116022, China | | ZHENG Yuan | State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
Roll Forging Technology Research Institute, Jilin University, Changchun 130022, China
Changchun Equipment Technology Research Institute, Changchun 130012, China | | YAN Shuai | CRRC Dalian Rolling Stock Co., Ltd., Liaoning Dalian 116022, China | | WANG Tian-yu | CRRC Dalian Rolling Stock Co., Ltd., Liaoning Dalian 116022, China | | LI Wen-bin | CRRC Dalian Rolling Stock Co., Ltd., Liaoning Dalian 116022, China | | CHE Chao-jie | State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
Engineering Research Center of Ministry of Education for Heavy Machinery, Taiyuan University of Science and Technology, Taiyuan 030024, China | | CHENG Li-ren | State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
Ganjiang Innovation Research Institute, Chinese Academy of Sciences, Jiangxi Ganzhou 341119, China |
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| 中文摘要: |
| 目的 改善AZ91镁合金在温度超过120 ℃时的力学性能。方法 在AZ91合金中添加Ca、Si和La/Ce混合稀土元素。在360 ℃下等温挤压，平均挤压速度为1.2 mm/s，挤压比为30︰1，以探究Ca、Si和La/Ce混合稀土元素对AZ91合金力学性能、物相组成和显微组织等的影响。结果 在AZ91挤压态合金中，与添加Si元素相比，Ca元素对挤压态合金的力学性能影响更大。在室温时，Mg–9Al–Zn–0.5RE–Si挤压态合金的屈服强度、极限抗拉强度和伸长率分别是254 MPa、306 MPa、7.0%，而Mg–9Al–Zn–0.5RE–0.5Ca挤压态合金的屈服强度、极限抗拉强度和伸长率分别是308 MPa、330 Ma、7.1%。Mg–9Al–Zn–0.5RE–0.5Ca–0.5Si挤压态合金室温力学性能最佳，其屈服强度、极限抗拉强度和伸长率分别是351 MPa、383 MPa、7.4%，说明Ca、Si这2种元素的协同作用可同时提高室温下AZ91合金的强度和塑性。在150 ℃和200 ℃下，Mg–9Al–Zn–0.5RE– 0.5Ca–0.5Si合金仍然具有最佳的力学性能。在150 ℃下，其屈服强度、极限抗拉强度和伸长率分别为174 MPa、225 MPa、31.8%。在200 ℃下，其屈服强度、极限抗拉强度和伸长率分别为136 MPa、153 MPa、49%。挤压后合金中形成 、 平行于挤压方向的织构。结论 经过360 ℃的热挤压后，由于动态析出、动态再结晶和织构的作用，显著提高了合金的拉伸性能。在室温、150 ℃、200 ℃下，Mg–9Al–Zn–0.5RE–0.5Ca–0.5Si挤压态合金的力学性能最佳，说明同时添加Ca、Si和La/Ce混合稀土元素有利于提高AZ91合金的耐热性。 |
| 英文摘要: |
| The work aims to improve the mechanical properties of AZ91 magnesium alloy at more than 120 ℃. Ca, Si and La/Ce mixed rare earth elements were added to AZ91 alloy. Isothermal extrusion was carried out at 360 ℃ with an average extrusion speed of 1.2 mm/s and an extrusion ratio of 30︰1 to explore the effects of Ca, Si and La/Ce mixed rare earth elements on the mechanical properties, phase composition and microstructure of AZ91 alloy. Ca had a greater effect on the mechanical properties of AZ91 extruded alloy than Si. At room temperature, the yield strength, tensile strength and elongation of Mg-9Al-Zn-0.5RE-Si extruded alloy were 254 MPa, 306 MPa and 7.0%, respectively. However, the yield strength, tensile strength and elongation of Mg-9Al-Zn-0.5RE-0.5Ca extruded alloy were 308 MPa, 330 MPa and 7.1%, respectively. The mechanical properties of Mg-9Al-Zn-0.5RE-0.5Ca-0.5Si extruded alloy at room temperature were the best, and its yield strength, tensile strength and elongation were 351 MPa, 383 MPa and 7.4%, respectively. It indicated that the strength and plasticity of AZ91 extruded alloy could be improved simultaneously through the synergistic action of Ca and Si. At 150 ℃ and 200 ℃, Mg-9Al-Zn-0.5RE-0.5Ca-0.5Si alloy still had the best mechanical properties. At 150 ℃, the yield strength, tensile strength and elongation were 174 MPa, 225 MPa and 31.8% respectively. At 200 ℃, the yield strength, tensile strength and elongation were 136 MPa, 153 MPa and 49% respectively. After extrusion, and textures parallel to the extrusion direction were formed in the alloy. After 360 ℃ hot extrusion, the tensile properties of the alloy can be significantly improved due to dynamic precipitation, dynamic recrystallization and texture. At room temperature, 150 ℃ and 200 ℃, the mechanical properties of Mg-9Al-Zn-0.5RE-0.5Ca-0.5Si are the best, indicating that the addition of Ca, Si and La/Ce mixed rare earth elements at the same time is beneficial to improving the heat resistance of AZ91 alloy. |
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