赵磊,王帅普,武明建,等.6061铝合金非连续搅拌摩擦增材制造与性能研究[J].精密成形工程,2024,16(12):124-132.
ZHAO Lei,WANG Shuaipu,WU Mingjian,et al.Synthesis and Performance of 6061 Aluminum Alloy via Non-continuous Friction Stir Additive Manufacturing[J].Journal of Netshape Forming Engineering,2024,16(12):124-132. |
| 6061铝合金非连续搅拌摩擦增材制造与性能研究 |
| Synthesis and Performance of 6061 Aluminum Alloy via Non-continuous Friction Stir Additive Manufacturing |
| 投稿时间：2024-11-12 |
| DOI：10.3969/j.issn.1674-6457.2024.12.010 |
| 中文关键词: 搅拌摩擦沉积增材 6061铝合金 宏观缺陷 材料流动 梯度力学性能 |
| 英文关键词: additive friction stir deposition 6061 aluminum alloy macro-defect material flow gradient mechanical properties |
| 基金项目:教育部产学合作协同育人项目(220604598164438);江苏省青蓝工程(2023-27) |
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| 中文摘要: |
| 目的 利用非连续搅拌摩擦沉积增材制造技术制备了6061铝合金并研究了z方向非连续搅拌对合金性能的影响。方法 使用超景深电子显微镜分析了预热时间对沉积增材成形工艺的影响，并探究了该工艺条件下沉积层的宏/微观缺陷、材料流动及拉伸力学性能关联规律。结果 采用z方向非连续搅拌摩擦沉积增材成形工艺，在预热时间为35 s的条件下，除无横向约束的前进侧和后退侧出现了孔洞、弧形飞边及弱结合等微观缺陷外，沉积层中原料棒与凸起搅拌作用区的组织表现为高致密无孔洞的良好形态，原料棒及刀具凸起的强搅拌作用造成z方向材料流动存在差异，进而获得力学性能沿z方向具有梯度分布的完整沉积层，提高了搅拌摩擦沉积增材制造6061铝合金的成形效率。结论 在相应的主轴转速(420 r/min)、平移速度(72 mm/min)、进料速度(72 mm/min)、刀具凸起高度(1.5 mm)与预热时间(35 s)工艺参数下，获得了稳定的增材沉积层，有效抑制了沉积层原料棒及凸起搅拌作用区的宏观缺陷，并使材料性能沿z方向呈梯度分布;沉积层抗拉强度达到了原料棒的57.15%;同时伸长率提升了185.8%，为高效率沉积增材及制备梯度性能构件提供了工艺借鉴。 |
| 英文摘要: |
| The work aims to synthesize 6061 aluminum alloy via the non-continuous additive stirring friction deposition manufacturing technology to study the effect of non-continuous stirring in the z-direction on the alloy's properties. The effect of preheating time on the process was analyzed with a super-depth-of-field electron microscope. The correlation laws between macro/micro defects, material flow and mechanical properties of the deposited layer under this process condition were investigated. The micro-defects, such as holes, arc-shaped flash, and weak bonding, appeared only on the advancing and retreating sides without lateral confinement. The non-continuous z-direction stirring friction deposition process, with a preheating time of 35 s, produced a well-formed deposited layer with high density and no voids in the material rod and the stirring region. The strong stirring of the raw material rod and tool protrusions caused differences in material flow in the z-direction, which resulted in a complete layer with gradient distribution of mechanical properties in the z-direction. This process enhanced the forming efficiency of 6061 aluminum alloy in stirring friction deposition. Under the process parameters of spindle speed (420 r/min), translation speed (72 mm/min), feed rate (72 mm/min), tool protrusion (1.5 mm), and preheating time (35 s), a stable additive deposition layer is obtained. The macro-defects in the z-direction, such as protrusions and the stirring region of the material rod, are suppressed effectively. It effectively inhibits the macro-defects of the raw material rod and the raised stirring zone of the deposited layer, and makes the material properties show gradient distribution along the z-direction. The deposited layer achieves a tensile strength of 57.15% of the material rod’s strength, with elongation increased by 185.8%. The work provides a proper process for high-efficiency deposition additive manufacturing and the preparation of gradient-performance components. |
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