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柱状晶组织Cu-Al-Mn合金内耗性能的各向异性和时效控制研究
Nisotropy and aging control of internal friction property of Cu-Al-Mn alloy with columnar crystal structure
投稿时间:2021-10-21  修订日期:2022-05-09
DOI:
中文关键词:  Cu-Al-Mn合金  形状记忆合金  各向异性  阻尼性能  时效控制
英文关键词:Cu-Al-Mn alloy  Shape memory alloy  Anisotropy  Damping performance  Aging control
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
朱岩 武汉理工大学工程结构与力学系 430070
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中文摘要:
      提高形状记忆合金在机械、建筑等领域应用性能的本质是提高材料的内耗性能。在变频、变温的条件下,对自研柱状晶Cu-Al-Mn形状记忆合金的阻尼内耗性能进行了研究。采用X射线衍射、差示扫描量热分析、动态热机械分析、光学金相显微镜、电子背散射衍射等检测分析手段,重点分析了合金的各向异性、振动频率、时效处理对其内耗性能的影响。结果表明:合金低频阻尼值均远好于高频阻尼值;低频时,0°和15°试样的阻尼内耗能力好于其他试样,阻尼系数峰值最大值分别为0.12和0.13,各向异性试样的阻尼内耗能力随着角度增大呈现出曲折降低的趋势;高频时,角度对材料阻尼能力的影响减弱,0°和45°试样的阻尼系数峰值略高于其他组试样,最大值均为0.04,且发现45°试样相对于其他试样对频率有明显的抵抗作用;时效处理产生的贝氏体会使合金的阻尼能力下降,但在低频时,少量的贝氏体可以增大合金的阻尼性能。
英文摘要:
      Improved shape memory alloy is widely used in machinery, construction and other fields. The essence of performance is to improve the internal friction of materials. In this paper, the damping internal friction properties of self-developed columnar crystal Cu-Al-Mn shape memory alloy were studied under the condition of variable frequency and temperature. X-ray diffraction, differential scanning calorimetry, dynamic thermo-mechanical analysis, optical microscopy, electron backscatter diffraction and other detection and analysis methods were used to analyze the influence of anisotropy, vibration frequency and aging treatment on the internal friction properties of the alloy. The results show that the low frequency damping value is much better than the high frequency damping value. The damping of martensitic phase is better than that of parent phase, and the damping performance of phase transition is the best when multiple phases coexist (A+R). At low frequencies, the damping internal friction capacity of 0° and 15° specimens is better than that of other specimens, and the maximum damping coefficient is 0.12 and 0.13, respectively. The damping internal friction capacity of anisotropic specimens decreases with the increase of Angle. At high frequency, the influence of Angle on material damping capacity is weakened. The peak damping coefficient of 0° and 45° samples is slightly higher than that of other samples, and the maximum value is 0.04. It is found that the 45° sample has obvious resistance to frequency compared with other samples. The damping capacity of the alloy decreases due to bainite produced by aging treatment, but at low frequencies, a small amount of bainite can increase the damping capacity of the alloy.
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