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| 累积连续流变挤压对Al-Mg(-Mn-Fe)合金组织性能影响 |
| Effect of Accumulative Continuous Extrusion Forming on Microstructure and Properties of Al-Mg(-Mn-Fe) Alloys |
| Received:May 06, 2024 |
| DOI：10.3969/j.issn.1674-6457.2024.07.019 |
| 中文关键词: Al-Mg(-Mn-Fe)合金 累积连续流变挤压 变形道次 组织性能 |
| 英文关键词: Al-Mg(-Mn-Fe) alloy ACEF deformation pass microstructure and properties |
| 基金项目:松山湖材料实验室开放课题基金(2023SLABFN11);国家重点研发计划(2022YFE0137900) |
| Author Name | Affiliation | | GAO Minqiang | Engineering Research Center of Continuous Extrusion, Ministry of Education, Dalian Jiaotong University, Liaoning Dalian 116028, China | | YANG Bowei | Engineering Research Center of Continuous Extrusion, Ministry of Education, Dalian Jiaotong University, Liaoning Dalian 116028, China | | GUAN Renguo | Engineering Research Center of Continuous Extrusion, Ministry of Education, Dalian Jiaotong University, Liaoning Dalian 116028, China |
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| 中文摘要: |
| 目的 研究多道次累积连续流变挤压变形对Al-Mg(-Mn-Fe)合金组织演化和力学行为的影响，为高性能细晶Al-Mg(-Mn-Fe)合金的制备提供借鉴与参考。方法 采用连续流变挤压方法制备Al-Mg(-Mn-Fe)合金，对流变挤压态Al-Mg(-Mn-Fe)合金进行多道次累积连续流变挤压变形，研究多道次变形前后Al-Mg(-Mn-Fe)合金的微观组织和力学性能变化，讨论变形过程中Al6(Mn,Fe)相对动态再结晶的影响，揭示累积连续流变挤压态Al-Mg(-Mn-Fe)合金的强化机制。结果 经3道次累积连续流变挤压变形后，Al-Mg合金和Al-Mg-Mn-Fe合金的平均晶粒尺寸分别减小至21.5 μm和2.8 μm，细化效果显著;在多道次变形过程中，Al-Mg-Mn-Fe合金内的Al6(Mn,Fe)相逐渐破碎细化并趋于均匀分布，再结晶驱动力增加，阻碍再结晶晶粒长大;经3道次变形后，Al-Mg合金杆材的抗拉强度和伸长率同步提高至267.4 MPa和52.2%，而Al-Mg-Mn-Fe合金杆材的抗拉强度提高至364.2 MPa，伸长率降低至31.7%，该合金的强化机制主要包括细晶强化、位错强化和第二相强化。结论 累积连续流变挤压变形可有效细化合金内的晶粒及第二相，提高Al-Mg(-Mn-Fe)合金的综合力学性能。 |
| 英文摘要: |
| The work aims to investigate the effect of multi-pass accumulative continuous extrusion forming (ACEF) on the microstructure evolution and mechanical behavior of Al-Mg(-Mn-Fe) alloys, to provide references for the preparation of fine-grained Al-Mg(-Mn-Fe) alloys with high performance. Al-Mg(-Mn-Fe) alloys were prepared by ACEF. The variation in microstructure and mechanical properties of Al-Mg(-Mn-Fe) alloys subject to multi-pass ACEF was studied. The effect of Al6(Mn, Fe) phase particles on dynamic recrystallization during deformation was discussed. The strengthening mechanisms of ACEFed Al-Mg(-Mn-Fe) alloys were revealed. The results showed that significant grain refinement effect was achieved in the Al-Mg alloy and Al-Mg-Mn-Fe alloy subject to 3 passes ACEF, and the average grain size decreased to 21.5 μm and 2.8 μm, respectively. The Al6(Mn, Fe) phase particles in the Al-Mg-Mn-Fe alloy were gradually broken, refined, and uniformly distributed during multi-pass ACEF. Thus, the driving force of dynamic recrystallization was enhanced and the growth of recrystallized grains was hindered. After 3 passes ACEF, the ultimate tensile strength and elongation of Al-Mg alloy rods increased to 267.4 MPa and 52.2%, respectively. Meanwhile, the ultimate tensile strength of Al-Mg-Mn-Fe alloy rods increased to 364.2 MPa and the elongation decreased to 31.7%. The strengthening mechanisms of the alloys mainly included fine-grained strengthening, dislocation strengthening and second phase strengthening. ACEF can refine the grains and secondary phase particles, and improve the comprehensive mechanical properties of the alloys. |
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