张会,王进,李宝阁,等.AZ31镁合金薄板的无针搅拌摩擦加工[J].精密成形工程,2022,14(3):87-93.
ZHANG Hui,WANG Jin,LI Bao-ge,et al.Needleless Friction Stir Processing of AZ31 Magnesium Alloy Sheet[J].Journal of Netshape Forming Engineering,2022,14(3):87-93. |
| AZ31镁合金薄板的无针搅拌摩擦加工 |
| Needleless Friction Stir Processing of AZ31 Magnesium Alloy Sheet |
| 投稿时间：2021-07-07 |
| DOI：10.3969/j.issn.1674-6457.2022.03.011 |
| 中文关键词: AZ31镁合金薄板 搅拌摩擦加工 无针搅拌头 力学性能 晶粒尺寸 |
| 英文关键词: AZ31 magnesium alloy sheet friction stir processing needleless stirring head mechanical properties grain size |
| 基金项目:山东省重点研发计划(2019GGX102023) |
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| 中文摘要: |
| 目的 研究有针、无针搅拌摩擦加工对AZ31镁合金薄板的微观组织和力学性能的影响。方法 通过搅拌摩擦加工技术(FSP)以不同的转速对AZ31镁合金薄板进行加工，采用拉伸试验机、金相显微镜、UMT摩擦磨损试验机、维氏硬度机对无针搅拌加工后的AZ31镁合金加工表面的晶粒形貌、拉伸性能、磨损性能和硬度进行研究分析，并与同转速有针搅拌进行比较。结果 无针条件下与同转速下的有针搅拌相比，焊缝表面更加细密、美观，无针加工下焊缝的抗拉强度最大为242 MPa，测得的维氏硬度最大为97.6HV，且焊缝的平均摩擦因数最小，为0.31。结论 无针时FSP镁合金焊缝的抗拉强度随刀具转速的提高而增大;焊缝的硬度与镁合金母材相比有明显的提高，且随刀具转速的提高，维氏硬度值逐渐降低;无针条件下获得的AZ31镁合金焊缝的平均摩擦因数随刀具转速的增加而增大，与同转速时有针条件下获得的焊缝的平均摩擦因数相比，无针时获得的焊缝平均摩擦因数明显更高;无针时获得的焊缝表面的晶粒尺寸随转速的增加而增大。 |
| 英文摘要: |
| The work aims to study the effect of needle and needleless friction stir processing on the microstructure and mechanical properties of AZ31 magnesium alloy sheet. AZ31 magnesium alloy sheet was processed by friction stir processing (FSP) at different speed. The grain morphology, tensile properties, wear properties and hardness of AZ31 magnesium alloy surface after needleless stirring were studied and analyzed by tensile testing machine, metallographic microscope, UMT friction and wear testing machine and Vickers hardness machine, and then compared with those of sheet after needle stirring at the same speed. Compared with the sheet under needle stirring at the same speed, the weld surface under needleless stirring was more fine and beautiful. Under needleless processing, the maximum tensile strength of the weld was 242 MPa, the maximum Vickers hardness was 97.6HV, and the average friction coefficient was the lowest, just 0.31. The tensile strength of FSP magnesium alloy weld under needleless stirring increases with the increase of tool speed. The hardness of weld is obviously higher than that of magnesium alloy base metal, and the Vickers hardness decreases with the increase of tool speed. The average friction coefficient of AZ31 magnesium alloy weld obtained under needleless processing increases with the increase of tool speed. Compared with the average friction coefficient of weld obtained under needle processing at the same speed, the average friction coefficient of weld obtained under needleless processing is significantly higher. The grain size of weld surface obtained under needleless processing increases with the increase of speed. |
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