高阻尼MnCuNiFeCe合金的相變及阻尼機(jī)制研究
發(fā)布時(shí)間：2018-12-15 07:23
【摘要】：高端精密儀器領(lǐng)域的振動(dòng)及噪聲問題越來越引起關(guān)注,利用高阻尼合金抑制振動(dòng)或降低噪聲,是解決振動(dòng)和噪聲的重要手段。MnCu合金通過合適的熱處理,可以獲得出色的阻尼性能,并兼具優(yōu)良的力學(xué)性能,因此受到人們的青睞。本文采用真空熔煉、開坯鍛造等通用工藝制備Mn20Cu5Ni2FeCe合金。運(yùn)用多功能振動(dòng)樣品磁強(qiáng)計(jì)、激光熱膨脹儀及動(dòng)態(tài)熱機(jī)械分析儀等手段,研究了固溶及時(shí)效狀態(tài)合金的相轉(zhuǎn)變及阻尼性能。研究結(jié)果表明:合金的物理膨脹系數(shù)在235K左右低溫區(qū)出現(xiàn)極小值,同時(shí)磁化強(qiáng)度在該溫區(qū)發(fā)生轉(zhuǎn)變。分析得知該轉(zhuǎn)變?yōu)楹辖鹬胸歁n區(qū)的順磁反鐵磁性轉(zhuǎn)變。該貧Mn區(qū)低溫磁性轉(zhuǎn)變引起晶格畸變,在應(yīng)力的作用下,出現(xiàn)低溫孿晶亞結(jié)構(gòu),導(dǎo)致在該溫區(qū)出現(xiàn)低溫阻尼峰。根據(jù)上述研究結(jié)果,提出的MnCu合金阻尼機(jī)制的微觀模型能夠解釋阻尼溫度譜的特征。
[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.
【作者單位】： 鋼鐵研究總院功能材料研究所精密合金技術(shù)北京市重點(diǎn)實(shí)驗(yàn)室;北京科技大學(xué)新材料技術(shù)研究院;
【基金】：北京市自然科學(xué)基金項(xiàng)目(2142037)資助
【分類號(hào)】：TG139
，
本文編號(hào)：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.
【作者單位】： 鋼鐵研究總院功能材料研究所精密合金技術(shù)北京市重點(diǎn)實(shí)驗(yàn)室;北京科技大學(xué)新材料技術(shù)研究院;
【基金】：北京市自然科學(xué)基金項(xiàng)目(2142037)資助
【分類號(hào)】：TG139
，
本文編號(hào)：2380245
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