臧兰兰,郑嫄,阎帅,等.挤压态Mg–9Al–Zn–0.5RE–Ca–Si合金微观组织和力学性能[J].精密成形工程,2023,15(5):26-35.
ZANG Lan-lan,ZHENG Yuan,YAN Shuai,et al.#$NPMicrostructure and Mechanical Properties of as-Extruded Mg-9Al-Zn-0.5RE-Ca-Si Alloy[J].Journal of Netshape Forming Engineering,2023,15(5):26-35. |
| 挤压态Mg–9Al–Zn–0.5RE–Ca–Si合金微观组织和力学性能 |
| #$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) |
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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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