本文選題：銅基塊體非晶合金 + 成分設(shè)計(jì)��； 參考：《東南大學(xué)》2015年博士論文

【摘要】：Cu基塊體非晶合金具有優(yōu)異的力學(xué)、物理及化學(xué)性能,是當(dāng)前高性能先進(jìn)金屬材料的研究熱點(diǎn)。目前國(guó)內(nèi)外學(xué)者對(duì)塊體非晶合金,尤其是多元塊體非晶合金的非晶形成能力預(yù)測(cè)方法認(rèn)識(shí)還不夠。而在性能方面,現(xiàn)階段的研究對(duì)于材料的塑性變形能力與合金耐腐蝕性能的研究仍不夠深入。因此,本文從Cu基塊體非晶合金的成分設(shè)計(jì)入手,利用相圖熱力學(xué)數(shù)據(jù),預(yù)測(cè)多元Cu基非晶合金成分的凝固過(guò)程,并依據(jù)合金化技術(shù)手段構(gòu)建塊體非晶合金及其復(fù)合材料,改善其塑性變形能力。使用X射線衍射、示差掃描量熱及微觀組織分析表征了合金的非晶本質(zhì),同時(shí)研究合金化元素和紫外光輻照對(duì)塊體非晶合金電化學(xué)腐蝕行為的影響。通過(guò)統(tǒng)計(jì)T_m與T_g之間的線性關(guān)系,將非晶形成能力參數(shù)T_rg=T_g/T_1合理地變換成T_rg=κT_m/Tl+C/T_1,該式反映了固相線溫度T_m也是影響非晶形成能力的重要參數(shù),同時(shí)也揭示了液相線溫度Tt對(duì)非晶形成能力的重要作用。另一方面,該將參數(shù)T_rg從后驗(yàn)性參數(shù)轉(zhuǎn)換成預(yù)測(cè)性參數(shù),可以用于預(yù)測(cè)具有較高非晶形成能力的合金成分。同時(shí),該參數(shù)揭示了合金的凝固溫度區(qū)間對(duì)該合金的非晶形成能力的影響規(guī)律。根據(jù)該規(guī)律,設(shè)計(jì)并制備了多種三元Cu-Zr-Ti和Cu-Zr-Al系塊體非晶合金。本論文設(shè)計(jì)的三元Cu-Zr-Ti塊體非晶合金中,Ti元素含量范圍在7.5-8.5at.%之間的塊體非晶合金具有較大的塑性。通過(guò)熱力學(xué)計(jì)算與合金凝固過(guò)程預(yù)測(cè),并添加合金元素制備了三類(lèi)四元塊體非晶合金。Cu-Zr-Ti-Ni系合金中的Cu_(54.5)Zr_(37)Ti_8Ni_(0.5)、Cu-Zr-Ti-Si 合金中的 Cu_(54.5)Zr_(37)Ti_8Si_(0.5)、Cu_(53.5)Zr_(37)Ti_8Si_(1.5)表現(xiàn)較大的塑性變形能力。另外,通過(guò)分析組元間二元相圖,選取了Mo、Nb和Hf元素分別取代Cu_(50.2)Zr_(40.8)Ti_9塊體非晶合金中的Ti元素,Cu_(50.2)Zr_(40.8)Ti_8Mo_(1.0)、 Cu_(50.2)Zr_(40.8)Ti_8Nb_(1.0)和Cu_(50.2)Zr_(40.8)Ti_8Hf_(1.0)在各自的體系內(nèi)均表現(xiàn)出最好的塑性和斷裂強(qiáng)度。在本論文設(shè)計(jì)的所有合金中,Cu_(50)Zr_(42.5)Ti_(7.5)、Cu_(51.7)Zr_(40.8)Ti_(7.5)、 Cu_(54.5)Zr_(37)Ti_8Ni_(0.5)、Cu_(50.2)Zr_(40.8)Ti_8Nb_(1.0)和Cu_(50.2)Zr_(40.8)Ti_7Nb_(2.0)合金的壓縮塑性和斷裂強(qiáng)度分別超過(guò)了10%和2000 MPa。通過(guò)納米壓痕研究了塑性差別明顯的兩類(lèi)塊體非晶基復(fù)合材料的壓痕蠕變行為,發(fā)現(xiàn)了合金的塑性與非晶基體的結(jié)構(gòu)密切相關(guān)。添加合金元素Al、Ni、Si、Mo、Nb和Hf均可以提高Cu-Zr-Ti塊體非晶合金的腐蝕電位。另一方面,Cu_(54.5)Zr_(37)Ti_8Si_(0.5)合金的腐蝕電流密度明顯低于Cu_(55)Zr_(37)Ti_8。采用紫外光輻照,研究了兩種Cu基塊體非晶合金電化學(xué)腐蝕行為。動(dòng)態(tài)極化曲線、電化學(xué)阻抗譜分析表明：Cu基塊體非晶合金在紫外光輻照情況下腐蝕電流密度(腐蝕速率)降低和耐點(diǎn)蝕能力提高。通過(guò)觀察腐蝕表面形貌,發(fā)現(xiàn)Cu基塊體非晶合金在紫外光輻照條件下,點(diǎn)蝕位置較少且點(diǎn)蝕面積較小,證實(shí)了Cu基塊體非晶合金在紫外光輻照的環(huán)境中具有高的耐點(diǎn)蝕能力。
[Abstract]:Cu based bulk amorphous alloys have excellent mechanical, physical and chemical properties. It is a hot topic in the current research of high performance advanced metal materials. At present, scholars at home and abroad are not aware of the prediction methods for the amorphous forming ability of bulk amorphous alloys, especially bulk amorphous alloys. The research on the properties of the deformability and corrosion resistance of the alloy is still not deep enough. Therefore, this paper, starting with the composition design of the Cu based bulk amorphous alloy, predicts the solidification process of the component of the multivariate Cu base amorphous alloy by using the thermodynamic data of the phase diagram, and builds the bulk amorphous alloy and its composite by means of alloying technology to improve its plastic deformation. The amorphous nature of the alloy was characterized by X ray diffraction, differential scanning calorimetry and microstructural analysis, and the effects of alloying elements and UV irradiation on the electrochemical corrosion behavior of bulk amorphous alloys were investigated. By the linear relationship between T_m and T_g, the amorphous formation capacity parameter T_rg=T_g/T_1 was rationally transformed into T_rg=. Kappa T_m/Tl+C/T_1, which reflects that the solid phase temperature T_m is also an important parameter affecting the amorphous formation ability, and also reveals the important role of the liquidus temperature Tt for the amorphous formation ability. On the other hand, the parameter T_rg is converted from the posterior parameter to the predictive parameter, which can be used to predict the alloy formation with higher amorphous formation ability. At the same time, this parameter reveals the influence of the solidification temperature range of the alloy on the amorphous forming ability of the alloy. According to this rule, a variety of three element Cu-Zr-Ti and Cu-Zr-Al bulk amorphous alloys have been designed and prepared. In this paper, the three element Cu-Zr-Ti bulk amorphous alloys have been designed and the Ti element content ranges from 7.5-8.5at.% to the bulk of the amorphous alloy. The crystalline alloy has large plasticity, and the Cu_ (54.5) Zr_ (37) Ti_8Ni_ (0.5), Cu_ (54.5) Zr_ (37) Ti_8Si_ (0.5), Cu_ (53.5) Zr_ (37) Ti_8Si_ (1.5)) of three kinds of amorphous alloy.Cu-Zr-Ti-Ni alloys are prepared by thermodynamic calculation and alloy solidification, and the alloy elements are added to the alloy. In addition, by analyzing the two element phase diagram between the components, Mo, Nb and Hf elements are selected to replace the Ti elements in Cu_ (50.2) Zr_ (40.8) Ti_9 block amorphous alloys, Cu_ (50.2) Zr_ (40.8) Ti_8Mo_ (1), Cu_ (50.2) Zr_ (40.8) (1) and 50.2) (40.8) (1) show the best plasticity and fracture in their respective systems. Strength. In all alloys designed in this paper, the compression plasticity and fracture strength of Cu_ (50) Zr_ (42.5) Ti_ (7.5), Cu_ (51.7) Zr_ (40.8) Ti_ (7.5), Cu_ (54.5) Zr_ (37) Ti_8Ni_ (0.5), Cu_ (50.2) Zr_ (40.8) Ti_8Nb_ (1) and 50.2) The indentation creep behavior of the two bulk amorphous matrix composites shows that the plasticity of the alloy is closely related to the structure of the amorphous matrix. Adding alloy elements Al, Ni, Si, Mo, Nb and Hf can improve the corrosion potential of the amorphous alloy of Cu-Zr-Ti block. On the other hand, the corrosion current density of Cu_ (54.5) Zr_ (37) Ti_8Si_ (0.5) alloys is obviously lower than that of Cu_. (55) Zr_ (37) Ti_8. was irradiated with ultraviolet light to study the electrochemical corrosion behavior of two Cu based bulk amorphous alloys. The dynamic polarization curves and electrochemical impedance spectroscopy showed that the corrosion current density (corrosion rate) and pitting resistance of Cu based bulk amorphous alloys were reduced and the resistance to pitting was increased under UV irradiation. The present Cu based bulk amorphous alloys have less pitting location and smaller pitting area under UV irradiation. It is proved that the Cu based bulk amorphous alloys have high resistance to pitting resistance in ultraviolet radiation.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TG139.8
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本文編號(hào)：1926538