【摘要】：隨著現(xiàn)代化科技日趨完善,出行的便捷性和安全成為了人們首先考慮的因素。航空航天與飛行器也開始沿著輕量化、高速化和高效率化的方向發(fā)展。但也會給人們的生活帶來一些麻煩,即噪音與振動的問題。因此,對于結(jié)構的輕量化、節(jié)約能源、減低振動降低噪音的性能提出了急切的需求。鎂不僅擁有密度低、比強度高的一些良好的商用性,而且它也是阻尼性能非常好的金屬材料,因而能夠滿足上述需求。針對以上的所提出的問題,本文首先選用Mg-1Si合金作為研究的母合金,在其基礎上添加一些變質(zhì)元素的中間合金,熔煉使其成為合金體系。采用OM金相顯微組織分析、X射線衍射(XRD)、掃描電子顯微鏡(SEM)、拉伸力學性能測試、動態(tài)機械分析(DMA)等實驗手段研究了體系中的組織形貌、力學性能及其阻尼性能的變化。本文首先介紹了鎂合金的阻尼性能的研究意義,概括了鎂合金阻尼性能的國內(nèi)外的研究現(xiàn)狀,總結(jié)了目前金屬阻尼材料的表征、測量方法及形成機理,提出了本論文的研究目的及意義。研究通過擬添加Mn、Zr、Ca這三種不同的變質(zhì)元素的中間合金來改善Mg-1Si的力學性能,并研究這三種元素對Mg-1Si合金的組織及阻尼性能的影響。結(jié)果表明,這三種元素都能明顯的使得母合金的組織得到細化,組織細化后抗拉強度和伸長率也得到了提高。然后測試其阻尼性能的變化,發(fā)現(xiàn)三種元素都能夠使得母合金的阻尼性能得到提高,成為高阻尼的合金,這三種變質(zhì)元素對合金阻尼性能的影響機制都可以用G-L理論來解釋。
[Abstract]:With the development of modern technology, the convenience and safety of travel has become the first consideration. Aerospace and aircraft also began to develop along the direction of lightweight, high-speed and efficiency. But it will also bring some trouble to people's life, namely noise and vibration. Therefore, there is an urgent demand for the lightweight structure, saving energy, reducing vibration and reducing noise. Magnesium is not only a good commercial material with low density and high specific strength, but also a metal material with very good damping property, so it can meet the above requirements. In order to solve the above problems, Mg-1Si alloy was selected as the parent alloy, and some master alloys with modified elements were added to the alloy, and melting made it into an alloy system. The microstructure and morphology of the system were studied by means of OM metallographic microstructure analysis, X-ray diffraction (XRD), scanning electron microscope (SEM),) tensile mechanical properties test and dynamic mechanical analysis (DMA). Changes in mechanical properties and damping properties. In this paper, the research significance of damping properties of magnesium alloys is introduced, the research status of damping properties of magnesium alloys at home and abroad is summarized, and the characterization, measurement methods and formation mechanism of metal damping materials are summarized. The purpose and significance of this paper are put forward. The mechanical properties of Mg-1Si were improved by adding Mn,Zr,Ca master alloy, and the effects of these three elements on the microstructure and damping properties of Mg-1Si alloy were studied. The results show that these three elements can obviously refine the microstructure of the parent alloy, and improve the tensile strength and elongation after the refinement. Then the change of damping property is tested and it is found that all three elements can improve the damping property of parent alloy and become a high damping alloy. The mechanism of the influence of these three modification elements on the damping properties of the alloy can be explained by the theory of G\ -\ {\} L\-1.
【學位授予單位】：南昌航空大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG146.22

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本文編號：2433716