發(fā)布時間：2018-06-20 07:42

  本文選題：非晶 + 潤濕性��； 參考：《沈陽理工大學》2017年碩士論文

【摘要】：近年來,Ti基非晶合金的非晶形成能力成功提高到了厘米級,Ti基塊體非晶也因其高強度、低密度等特性在工程結構材料中有良好的應用前景。但是,室溫下塊體非晶極低的塑性卻限制了它的應用。通過引入增塑相,制備非晶復合材料可以有效改善塊體非晶的塑性。最近,對于非晶復合材料的結構可控制備逐漸受到了科研人員的關注,這對開發(fā)具有高性能的非晶復合材料具有重要意義。外加法是一種簡單并且可控性強的制備復合材料的方法,而內生型非晶復合材料中的兩相具有十分優(yōu)異的相容性和界面結合質量。本文從基體與第二相的潤濕性與固液交互作用出發(fā),研究了層狀復合Ti32.8Zr30.2Ni5.3Cu9Be22.7非晶和與之具有良好相容性的Ti_(61.5)Zr_(36.4)Cu_(2.1)合金的可行性和復合后材料的微觀結構組成。研究了Ti32.8Zr30.2Ni5.3Cu9Be22.7非晶與Ti_(61.5)Zr_(36.4)Cu_(2.1)合金的潤濕行為,二者具有良好的潤濕性。連續(xù)升溫過程中潤濕角分兩次減小,在750、800和850℃保溫時,潤濕動力學曲線分為快速減小階段和穩(wěn)態(tài)階段。界面上發(fā)生Ti_(61.5)Zr_(36.4)Cu_(2.1)合金的溶解反應,固液交界處形成了結合質量很好的原子擴散層。非晶合金熔化后,內部析出了初級晶化產物,800℃時該產物完全消失。因此,制備復合材料時需將溫度控制在800℃以上用水淬法制備了液橋樣品來模擬層狀非晶復合材料的結合,研究了層狀非晶復合材料的結構。結果表明,在800℃以上制備的復合材料是由部分Ti_(61.5)Zr_(36.4)Cu_(2.1)合金溶解進入非晶層中形成的非晶復合材料層與剩余Ti_(61.5)Zr_(36.4)Cu_(2.1)合金層組成的�；赥i32.8Zr30.2Ni5.3Cu9Be22.7與Ti_(61.5)Zr_(36.4)Cu_(2.1)間良好化學成分穩(wěn)定性,非晶復合材料層由Ti32.8Zr30.2Ni5.3Cu9Be22.7非晶基體與β-Ti(Zr,Cu)枝晶相組成。一定冷速條件下,Ti32.8Zr30.2Ni5.3Cu9Be22.7熔體對Ti_(61.5)Zr_(36.4)Cu_(2.1)有一定的溶解度,非晶熔體中Ti_(61.5)Zr_(36.4)Cu_(2.1)的濃度需超過溶解度才能在凝固過程中析出枝晶相。隨保溫時間延長,基片溶解反應逐漸停止,復合材料層中的枝晶相分布逐漸均勻。統(tǒng)計液橋樣品基片的溶解深度,由于Ti_(61.5)Zr_(36.4)Cu_(2.1)的密度略小于Ti32.8Zr30.2Ni5.3Cu9Be22.7熔體的密度,液橋樣品下基片受到了重力驅動對流的作用,所以其溶解深度略大于上基片。選擇了一種溶解深度預測模型對基片溶解深度進行擬合,并且驗證了擬合數(shù)值的正確性。根據該模型的擬合值可以了解不同溫度下復合材料層中均勻分布的枝晶相的體積分數(shù),從而控制復合材料層的性能。另外,還可以利用該模型設計層狀材料層間厚度比,達到控制層狀復合材料整體性能的目的。
[Abstract]:In recent years, the amorphous formation ability of Ti based amorphous alloys has been successfully raised to centimeter level. The amorphous Ti based bulk has a good application prospect in engineering structure materials because of its high strength and low density. However, the low amorphous plasticity at room temperature limits its application. By introducing plasticized phase, the preparation of amorphous composites can be made. The plasticity of the bulk amorphous is effectively improved. Recently, the control of the structure of amorphous composites has gradually attracted the attention of the researchers, which is of great significance for the development of high performance Amorphous Composites. In this paper, the feasibility of the laminated composite Ti32.8Zr30.2Ni5.3Cu9Be22.7 amorphous and Ti_ (61.5) Zr_ (36.4) Cu_ (2.1) and the microstructure of the composite after the wettability and solid liquid interaction of the matrix and the second phase are studied. The wetting behavior of Ti32.8Zr30.2Ni5.3Cu9Be22.7 amorphous and Ti_ (61.5) Zr_ (36.4) Cu_ (2.1) alloy was investigated, and the two had good wettability. The wetting angle was reduced two times during the continuous heating process. The wetting kinetics curve was divided into a rapid decrease stage and a steady state at 750800 and 850 C. Ti_ (61.5) Zr_ (36.4) Cu_ (2.1) occurred on the interface. The dissolving reaction of the alloy formed a good atomic diffusion layer with good quality at the junction of solid and liquid. After the melting of the amorphous alloy, the primary crystallization product was precipitated, and the product completely disappeared at 800 C. Therefore, the temperature of the composite material was controlled at 800 degrees centigrade, and the liquid bridge sample was prepared by water quenching to simulate the layered amorphous composite. The structure of layered Amorphous Composites is studied. The results show that the composite material prepared at above 800 degrees C is composed of amorphous composite layer formed in the amorphous layer by partial Ti_ (61.5) Zr_ (36.4) Cu_ (2.1) alloy and remaining Ti_ (61.5) Zr_ (36.4) Cu_ (2.1) alloy layer. Based on Ti32.8Zr30.2Ni5.3Cu9Be22.7 and Ti_ (61.5) Z) The stability of chemical composition between r_ (36.4) Cu_ (2.1), amorphous composite layer composed of Ti32.8Zr30.2Ni5.3Cu9Be22.7 amorphous matrix and beta -Ti (Zr, Cu) dendrite. Under certain cold speed conditions, Ti32.8Zr30.2Ni5.3Cu9Be22.7 melts have certain solubility to Ti_ (61.5) Zr_ (36.4) Cu_ (2.1), Ti_ (61.5) Zr_ (2.1) in amorphous melt. The dendrite phase can be precipitated during the solidification process. With the prolongation of the heat preservation time, the dissolution reaction of substrate dissolves gradually and the dendrite phase distribution in the composite layer is evenly distributed. The dissolution depth of the base sheet of the liquid bridge sample is statistically less than the density of Ti_ (61.5) Zr_ (36.4) Cu_ (2.1) less than the density of the melt in the liquid bridge, and the liquid bridge sample The substrate is driven by the action of gravity driven convection, so the dissolution depth is slightly larger than that of the upper substrate. A solution depth prediction model is selected to fit the dissolution depth of the substrate, and the correctness of the fitting value is verified. The volume fraction is used to control the properties of the composite layer. In addition, the model can be used to design the thickness ratio between layers of layered materials to control the overall performance of layered composites.
【學位授予單位】：沈陽理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG139.8

【參考文獻】

相關期刊論文 前7條

1 張波;付華萌;朱正旺;張海峰;董闖;胡壯麒;;W纖維直徑對鋯基非晶復合材料壓縮力學性能的影響[J];金屬學報;2013年10期

2 ;Centimeter-sized Ti-based bulk metallic glass with high specific strength[J];Progress in Natural Science:Materials International;2012年05期

3 唐明強;朱正旺;付華萌;王愛民;李宏;張宏偉;馬國鋒;張海峰;胡壯麒;;內生枝晶相體積分數(shù)可控的鈦基非晶復合材料[J];金屬學報;2012年07期

4 ;TiZr-base Bulk Metallic Glass with over 50 mm in Diameter[J];Journal of Materials Science & Technology;2010年06期

5 ;Super-plasticity of Zr_(64.80)Cu_(14.85)Ni_(10.35)Al_(10) bulk metallic glass at room temperature[J];Chinese Science Bulletin;2008年03期

6 陳德民,孫劍飛,沈軍;塊體非晶合金絕熱升溫與鋸齒流變機制[J];金屬學報;2005年02期

7 ;Interfacial morphologies between iron and Ag-Cu-Sn alloy[J];Chinese Science Bulletin;1999年16期

相關碩士學位論文 前2條

1 劉丁銘;內生枝晶相Ti基非晶復合材料的設計與制備研究[D];東北大學;2014年

2 楊振文;C/SiC復合材料與TiAl合金的原位反應輔助釬焊機理研究[D];哈爾濱工業(yè)大學;2010年

，

本文編號：2043520