Preparation and damping behavior of NiTip/5052 Al composites
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摘要: 随着工业技术的发展,机械工程领域对铝合金材料的减振降噪性能提出了更高的要求。针对铝合金本征阻尼较低的问题,本文通过搅拌摩擦加工(FSP)制备出具有相变阻尼特征的NiTip/5052 Al复合材料。利用SEM、EDS和XRD对NiTip/5052 Al复合材料的微观结构和物相组成进行分析;分别采用差式扫描量热仪(DSC)、万能试验机和动态热机械分析仪(DMA)分析复合材料的相变过程、力学性能及其阻尼行为。研究表明:经过FSP后,NiTi颗粒与5052 Al基体界面结合良好,未发生界面反应;NiTip/5052 Al复合材料具备NiTi合金的马氏体相变特征;NiTip/5052 Al复合材料的强度均高于5052 Al合金和FSP-5052 Al合金,其中as-NiTip/5052 Al复合材料的抗拉强度为240 MPa,分别比5052 Al和FSP-5052 Al合金高23.7%和10.1%;NiTip/5052 Al复合材料的阻尼性能均明显优于5052 Al合金和FSP-5052 Al合金,且复合材料均呈现出明显的相变内耗峰;当升温至23℃时,550℃-NiTip/5052 Al复合材料的内耗峰值分别比5052 Al和FSP-5052 Al合金高300%和140%;当升温至33℃时,as-NiTip/5052 Al复合材料的内耗峰值分别比5052 Al和FSP-5052 Al合金高233%和100%;NiTip/5052 Al复合材料的储能模量均随着温度和应变的增加而减小,且均高于5052 Al合金和FSP-5052 Al合金。
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关键词:
- NiTi颗粒 /
- 铝基复合材料 /
- 搅拌摩擦加工(FSP) /
- 相变 /
- 阻尼行为
Abstract: With the development of industrial technology, the field of mechanical engineering has put forward higher requirements for the vibration and noise reduction of aluminum alloy materials. In order to solve the problem of low intrinsic damping of aluminum alloy, NiTip/5052 Al composites with phase transformation damping characteristics were prepared by friction stir processing (FSP). The microstructure and phase composition of NiTip/5052 Al composites were analyzed by SEM, EDS and XRD. The phase transformation processes, mechanical properties and damping behaviors of the composites were analyzed by differential scanning calorimetry (DSC), universal testing machine and dynamic mechanical analysis (DMA), respectively. The results show that the interfaces between NiTi particles and 5052 Al matrix are well bonded after FSP, and no interfacial reaction occurs. The NiTip/5052 Al composites have martensitic transformation characteristics of NiTi alloy. The strength of NiTip/5052 Al composites are higher than 5052 Al and FSP-5052 Al alloy. The tensile strength of as-NiTip/5052 Al composite is 240 MPa, which is 23.7% and 10.1% higher than 5052 Al and FSP-5052 Al alloy, respectively. The damping properties of NiTip/5052 Al composites are significantly better than 5052 Al alloy and FSP-5052 Al alloy, and the composites exhibit significant phase transformation internal friction peaks. When the temperature rises to 23℃, the internal friction peak of 550℃-NiTip/5052 Al composite is 300% and 140% higher than 5052 Al and FSP-5052 Al alloys, respectively. When the temperature rises to 33℃, the internal friction peak of as-NiTip/5052 Al composite is 233% and 100% higher than 5052 Al and FSP-5052 Al alloys, respectively. The storage modulus of NiTip/5052 Al composites decrease with increasing temperature and strain, and their storage modulus are higher than 5052 Al alloy and FSP-5052 Al alloy. -
图 2 NiTip/5052 Al复合材料的SEM图像:(a) NiTi颗粒和NiTip/5052 Al复合材料;(b) 图2(a)的局部放大图;(c) 图2(b)的面扫描图;(d) NiTi颗粒与铝基体界面处的线扫描图
Figure 2. SEM images of NiTip/5052 Al composites: (a) NiTi particles and NiTip/5052 Al composites; (b) High magnification image of Fig.2(a); (c) Face scanning images of Fig.2(b); (d) Line scanning image at the interface between NiTi particle and Al matrix
表 1 5052 Al的标称化学成分 (wt%)
Table 1. Nominal chemical composition of 5052 Al (wt%)
Mg Fe Si Cr Cu Mn Zn Al 2.2-2.8 0.4 0.25 0.15-0.35 0.1 0.1 0.1 Balance 表 2 NiTi颗粒和NiTip/5052 Al复合材料的相变峰值温度
Table 2. Phase transformation peak temperatures of NiTi particles and NiTip/5052 Al composites
Sample Ap/℃ Rp/℃ Mp/℃ as-NiTip 19.7 5 −23.0 550℃-NiTip 14.1 — −14.2 as-NiTip/5052 Al 21.5 — −22.7 550℃-NiTip/5052 Al 12.0 — −24.7 Notes: Ap, Rp and Mp represent the peak temperatures of B19'→B2, B2→R and B2→B19' phase transition respectively, the peak temperature of R→B19' phase transition is also expressed by Mp. -
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