發(fā)布時間：2018-05-03 06:24

  本文選題：碳纖維 + 熔合劑�。� 參考：《太原理工大學》2017年碩士論文

【摘要】：碳纖維增強鋁合金層合板具有低密度、高比強度、優(yōu)越的耐腐蝕性能及尺寸穩(wěn)定性,在航空航天領域具有廣闊應用前景,但因界面潤濕性差或界面反應等問題,實現(xiàn)鋁合金與碳纖維的直接高質量界面結合較困難,限制了其廣泛應用。在Al基體與碳纖維間使用合金熔合劑解決界面結合問題是一種有效手段。Zn-8Al合金有較好的塑韌性及強度,能在較低溫度下良好浸潤碳纖維且與Al板形成有效界面結合。通過對熔合劑Zn-8Al合金化,可進一步改善其自身及層合板整體的力學性能。為此,本文選取添加Cu、Si合金元素及采用均勻化退火工藝對熔合劑進行改性,探究不同含量Cu元素、不同含量Si元素、不同時間均勻化退火對層合板力學性能的影響。本文采用磁懸浮熔煉爐進行Zn-8Al系熔合劑合金熔煉,通過鋪層熱壓法制備層合板,以實現(xiàn)熔合劑與5052Al板的高質量界面結合。使用箱式電阻爐進行退火處理。使用光學顯微鏡(OM)和掃描電鏡(SEM)觀察微觀組織形貌,使用能譜分析儀(EDS)和X射線衍射儀(XRD)對組織成分及物相進行分析,通過電子萬能試驗機及納米壓痕儀對層合板的拉伸力學性能及微區(qū)力學性能進行測試。研究結果表明:(1)Zn-8Al-XCu熔合劑組織由η(Zn)、α(Al)、ε(CuAl_2)三種物相組成,從η(Zn)、α(Al)兩相中析出的樹枝狀ε(CuAl_2)組織與層合板力學性能緊密相關。隨著Cu含量從1%增大到5%,ε(Cu Al_2)逐漸增多并纏繞成網(wǎng)狀,層合板的抗拉強度逐漸提高,伸長率先增大后減小。少量的ε(CuAl_2)相能有效改善合金塑性,含量過高會降低層合板塑性。Cu含量3%時,層合板綜合力學性能最佳,抗拉強度和伸長率分別達到315 MPa和1.31%。4%、5%Cu含量的熔合劑制備的層合板彈性模量明顯變大,達到碳纖維增強的目的。(2)Si在Zn-8Al-XSi熔合劑中以單質硅的形式存在,Zn-8Al-XSi熔合劑組織中只有η(Zn)、α(Al)、Si三種物相。硬脆相Si直接影響層合板力學性能,Si含量從0.5%增大到2.5%過程中,層合板伸長率逐漸減小,抗拉強度先增大后減小。1%Si含量的層合板性能最佳,抗拉強度、伸長率分別達到365 MPa和0.78%。Zn-8Al-XSi熔合劑中Si含量應控制在1%以下。(3)隨著均勻化退火時間增大,Zn-8Al-1Si熔合劑組織晶間偏析減緩,晶粒成分和尺寸均勻化程度提高。層合板抗拉強度降低,伸長率增大。晶粒成分均勻化是層合板塑性增強的決定因素。
[Abstract]:Carbon fiber reinforced aluminum alloy laminates have low density, high specific strength, excellent corrosion resistance and dimensional stability, and have a broad application prospect in the field of aerospace, but due to poor interface wettability or interface reaction, etc. It is difficult to realize the direct high quality interface between aluminum alloy and carbon fiber, which limits its wide application. It is an effective method to solve the interface bonding problem between Al matrix and carbon fiber by using alloy fusion agent. Zn-8Al alloy has better plastic toughness and strength, it can infiltrate carbon fiber well at lower temperature and form effective interface bonding with Al plate. By alloying the fusion agent Zn-8Al, the mechanical properties of the laminated plate and itself can be further improved. In this paper, the effect of Cu content, Si content and time homogenization annealing on the mechanical properties of laminates was investigated by adding Cu-Si alloy elements and homogenizing annealing process. In this paper, the magnetic suspension melting furnace is used to melt the Zn-8Al fusion alloy, and the laminated plate is prepared by hot pressing, so as to realize the high quality interface bonding between the fusion agent and the 5052Al plate. Use box resistance furnace for annealing. The microstructure was observed by means of optical microscope (Om) and scanning electron microscope (SEM). The composition and phase of the tissue were analyzed by energy dispersive spectroscopy (EDS) and X-ray diffractometer (XRD). The tensile and micromechanical properties of laminates were measured by electronic universal testing machine and nano-indentation instrument. The results show that the structure of Zn-8Al-XCu fusion agent consists of three kinds of phases: 畏 ~ (ZN), 偽 ~ (+) (Al ~ (2), 蔚 _ (CuAl2). The dendritic 蔚 -CuAl2) precipitated from 畏 _ (Zn), 偽 ~ (2) phase are closely related to the mechanical properties of the laminated laminates, and the results show that the structure of Zn-8Al-XCu melt is closely related to the mechanical properties of the laminated plywood. With the increase of Cu content from 1% to 5%, 蔚 CuAl2) gradually increased and wound into a network, and the tensile strength of laminated plates increased gradually, and the elongation increased first and then decreased. A small amount of 蔚 CuAl2) phase can effectively improve the plasticity of the alloy. When the content is too high, the plastic properties of the laminated plate can be reduced. When the content of Cu is 3, the comprehensive mechanical properties of the laminated plate are the best. The tensile strength and elongation reached 315 MPa and 1.31%, respectively, and the elastic modulus of the laminates prepared by the fusion agent with Cu content increased obviously. To achieve the purpose of carbon fiber reinforcement, there are only three phases in the microstructure of Zn-8Al-XSi fluxes in the form of simple silicon in the form of Zn-8Al-XSi fluxes. There are only three phases in the microstructure of Zn-8Al-XSi fluxes. In the process of increasing the mechanical properties and Si content of laminates from 0.5% to 2.5%, the elongation of laminates decreases gradually, and the tensile strength increases first and then decreases. The tensile strength of laminated plates is the best and the tensile strength is the best. The intergranular segregation of Zn-8Al-1Si fluxes decreases with the increase of homogenization annealing time, and the homogenization of grain composition and size increases with the increase of annealing time. The tensile strength of laminated plate decreases and the elongation increases. The homogenization of grain composition is the decisive factor of plastic strengthening of laminated plates.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB333

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