高阻尼MnCuNiFeCe合金的相变及阻尼机制研究
发布时间：2018-12-15 07:23
【摘要】：高端精密仪器领域的振动及噪声问题越来越引起关注,利用高阻尼合金抑制振动或降低噪声,是解决振动和噪声的重要手段。MnCu合金通过合适的热处理,可以获得出色的阻尼性能,并兼具优良的力学性能,因此受到人们的青睐。本文采用真空熔炼、开坯锻造等通用工艺制备Mn20Cu5Ni2FeCe合金。运用多功能振动样品磁强计、激光热膨胀仪及动态热机械分析仪等手段,研究了固溶及时效状态合金的相转变及阻尼性能。研究结果表明:合金的物理膨胀系数在235K左右低温区出现极小值,同时磁化强度在该温区发生转变。分析得知该转变为合金中贫Mn区的顺磁反铁磁性转变。该贫Mn区低温磁性转变引起晶格畸变,在应力的作用下,出现低温孪晶亚结构,导致在该温区出现低温阻尼峰。根据上述研究结果,提出的MnCu合金阻尼机制的微观模型能够解释阻尼温度谱的特征。
[Abstract]:The problem of vibration and noise in the field of high-end precision instruments has attracted more and more attention. The use of high damping alloys to suppress vibration or reduce noise is an important means to solve vibration and noise. It can obtain excellent damping property and excellent mechanical property, so it is favored by people. In this paper, Mn20Cu5Ni2FeCe alloy was prepared by vacuum melting and open forging. The phase transition and damping properties of solid solution and aging state alloys were studied by means of multifunctional vibrating sample magnetometer, laser thermal expansion instrument and dynamic thermal mechanical analyzer. The results show that the physical expansion coefficient of the alloy is minimum at about 235K and the magnetization changes at the same time. It is found that the transformation is paramagnetic antiferromagnetic transition in the poor Mn region of the alloy. The low temperature magnetic transition in the poor Mn region leads to lattice distortion. Under the action of stress, the low temperature twin substructure appears, which leads to the low temperature damping peak in the temperature region. According to the above results, the proposed micro-model of damping mechanism of MnCu alloy can explain the characteristics of damping temperature spectrum.
【作者单位】： 钢铁研究总院功能材料研究所精密合金技术北京市重点实验室;北京科技大学新材料技术研究院;
【基金】：北京市自然科学基金项目(2142037)资助
【分类号】：TG139
，
本文编号：2380245
[Abstract]:The problem of vibration and noise in the field of high-end precision instruments has attracted more and more attention. The use of high damping alloys to suppress vibration or reduce noise is an important means to solve vibration and noise. It can obtain excellent damping property and excellent mechanical property, so it is favored by people. In this paper, Mn20Cu5Ni2FeCe alloy was prepared by vacuum melting and open forging. The phase transition and damping properties of solid solution and aging state alloys were studied by means of multifunctional vibrating sample magnetometer, laser thermal expansion instrument and dynamic thermal mechanical analyzer. The results show that the physical expansion coefficient of the alloy is minimum at about 235K and the magnetization changes at the same time. It is found that the transformation is paramagnetic antiferromagnetic transition in the poor Mn region of the alloy. The low temperature magnetic transition in the poor Mn region leads to lattice distortion. Under the action of stress, the low temperature twin substructure appears, which leads to the low temperature damping peak in the temperature region. According to the above results, the proposed micro-model of damping mechanism of MnCu alloy can explain the characteristics of damping temperature spectrum.
【作者单位】： 钢铁研究总院功能材料研究所精密合金技术北京市重点实验室;北京科技大学新材料技术研究院;
【基金】：北京市自然科学基金项目(2142037)资助
【分类号】：TG139
，
本文编号：2380245
本文链接：https://www.wllwen.com/kejilunwen/jiagonggongyi/2380245.html
