本文選題：非晶合金　切入點(diǎn)：非晶復(fù)合材料　出處：《太原理工大學(xué)》2016年碩士論文

【摘要】：塊體非晶合金的出現(xiàn)打破了一直以來(lái)工程建設(shè)中以晶體材料為主體的格局。由于其結(jié)構(gòu)的特殊性,致使無(wú)數(shù)研究者將注意力集中在塊體非晶合金制備、性能等的探索上。迄今為止,塊體非晶合金的制備已經(jīng)可以通過很多方法獲得,其在尺寸上也有了極大的突破,目前報(bào)道的Pd42.5Cu30Ni7.5P20非晶合金的最大尺寸可達(dá)到80 mm。由于非晶合金具有傳統(tǒng)晶體材料所不具有的特殊結(jié)構(gòu),內(nèi)部不存在位錯(cuò)、界面等結(jié)構(gòu)缺陷,致使非晶合金擁有晶態(tài)合金所無(wú)法達(dá)到的優(yōu)異性能,如高強(qiáng)度、高硬度、超高抗腐蝕能力以及優(yōu)異的磁學(xué)性能等。這些優(yōu)異性能的呈現(xiàn)使非晶合金成為了當(dāng)今最具潛力的工程材料。盡管非晶合金具有很多優(yōu)異的性能,但其在室溫下的脆性斷裂導(dǎo)致其在許多領(lǐng)域的應(yīng)用受到了約束。為了克服這一缺點(diǎn),提高非晶合金的室溫韌性。本文通過向非晶合金中添加第二相制取兩相共存的非晶復(fù)合材料,將強(qiáng)度和塑性進(jìn)行完美結(jié)合,從而擴(kuò)大非晶合金的應(yīng)用范圍。本文通過銅模吸鑄法獲得了強(qiáng)度高且具有較好室溫塑性的非晶復(fù)合材料Zr58.5Ti14.3Nb5.2Cu6.1Ni4.9Be11.0,采用X射線衍射儀(XRD)和掃描電子顯微儀(SEM)等技術(shù)手段對(duì)該非晶復(fù)合材料的結(jié)構(gòu)進(jìn)行分析確認(rèn)。通過電化學(xué)測(cè)試方法,如動(dòng)電位極化曲線、交流阻抗譜等對(duì)非晶試樣在不同環(huán)境下的抗腐蝕能力進(jìn)行分析討論,同時(shí)還使用化學(xué)浸泡實(shí)驗(yàn)對(duì)腐蝕結(jié)果進(jìn)行進(jìn)一步的確認(rèn)。對(duì)于非晶復(fù)合材料腐蝕后的表面破壞情況可以通過SEM檢測(cè)方法進(jìn)行觀察,結(jié)合以上分析手段對(duì)該非晶復(fù)合材料的腐蝕機(jī)理進(jìn)行歸納總結(jié)。本文通過將Zr58.5Ti14.3Nb5.2Cu6.1Ni4.9Be11.0非晶復(fù)合材料放入不同濃度的NaCl溶液中進(jìn)行抗腐蝕行為的研究,結(jié)果發(fā)現(xiàn)該非晶合金在不同含量的NaCl溶液中抵抗腐蝕的能力與NaCl的增加量不呈對(duì)應(yīng)關(guān)系,而是呈拋物線趨勢(shì)。在中間值5%NaCl含量的時(shí)候,非晶復(fù)合材料的抗腐蝕能力最差,而在最低濃度1%和最高濃度15%時(shí)的抗腐蝕能力表現(xiàn)最優(yōu)異。通過對(duì)溶液中電介質(zhì)的分析可得出,該非晶復(fù)合材料在NaCl溶液中的抗腐蝕能力不僅與溶液中氧的含量有關(guān),還與溶液中氯離子的濃度有關(guān)。比較pH值不同的情況下該鋯基非晶復(fù)合材料的抗腐蝕行為,結(jié)果發(fā)現(xiàn)在NaOH溶液中材料的抗腐蝕分析結(jié)果出現(xiàn)了分歧,即極化曲線判斷結(jié)果與表面腐蝕破壞程度不一致。并且可以發(fā)現(xiàn)氯離子不僅對(duì)晶體材料具有很強(qiáng)侵蝕能力,對(duì)非晶合金及其復(fù)合材料的腐蝕也有很強(qiáng)的破壞能力。從含氯離子溶液中的表面腐蝕形貌可以觀察到,和晶態(tài)樹枝晶的抗腐蝕能力相比,非晶基體的抗腐蝕能力較差,在合金中其將優(yōu)先發(fā)生腐蝕溶解,這一差異的出現(xiàn)主要與Zr和Be等金屬元素在非晶基體和樹枝晶上的分布有關(guān)。
[Abstract]:The appearance of bulk amorphous alloys has broken the pattern of crystal materials as the main body in engineering construction.Due to its special structure, numerous researchers have focused on the preparation and properties of bulk amorphous alloys.Up to now, the preparation of bulk amorphous alloys can be obtained by many methods, and the size of bulk amorphous alloys has also made a great breakthrough. The maximum size of Pd42.5Cu30Ni7.5P20 amorphous alloys reported at present can reach 80 mm.Because the amorphous alloy has the special structure which the traditional crystal material does not have, the internal does not have the dislocation, the interface and so on structural defect, causes the amorphous alloy to have the outstanding performance which the crystalline alloy cannot achieve, such as the high strength, the high hardness,High corrosion resistance and excellent magnetic properties.These excellent properties make amorphous alloys the most promising engineering materials.Although amorphous alloys have many excellent properties, their brittle fracture at room temperature restricts their applications in many fields.In order to overcome this shortcoming, the room temperature toughness of amorphous alloy is improved.In this paper, two phase coexisting amorphous composites are prepared by adding the second phase to the amorphous alloy, and the strength and plasticity are combined perfectly, thus expanding the application range of the amorphous alloy.The amorphous composite Zr58.5Ti14.3Nb5.2Cu6.1Ni4.9Be11.0 with high strength and good room temperature plasticity was obtained by copper mould suction casting. The structure of the amorphous composite was analyzed and confirmed by means of X-ray diffractometer (XRD) and scanning electron microscopy (SEM).The corrosion resistance of amorphous samples in different environments was analyzed and discussed by electrochemical methods such as potentiodynamic polarization curve and impedance spectroscopy. The corrosion results were confirmed by chemical immersion test.The surface failure of amorphous composites after corrosion can be observed by means of SEM, and the corrosion mechanism of amorphous composites can be summarized by the above analysis methods.In this paper, the corrosion resistance of Zr58.5Ti14.3Nb5.2Cu6.1Ni4.9Be11.0 amorphous composites in NaCl solution with different concentration was studied. It was found that the ability of the amorphous alloy to resist corrosion in different content of NaCl solution did not correspond to the increase of NaCl.But a parabolic trend.The corrosion resistance of amorphous composites is the worst when the content of 5%NaCl is intermediate, but the corrosion resistance is the best at the lowest concentration of 1% and the highest concentration of 15.Through the analysis of the dielectric in the solution, it can be concluded that the corrosion resistance of the amorphous composite in NaCl solution is related not only to the content of oxygen in the solution, but also to the concentration of chloride ion in the solution.By comparing the corrosion resistance of the zirconium matrix amorphous composites with different pH values, it is found that the results of corrosion resistance analysis in NaOH solution are different, that is, the results of polarization curves are not consistent with the corrosion failure degree of the surface.It can also be found that chloride ion not only has a strong corrosion ability to the crystal material but also to the amorphous alloy and its composite material.From the surface corrosion morphology of chlorinated solution, it can be seen that compared with the corrosion resistance of crystalline dendrite, the corrosion resistance of amorphous matrix is poor, and the corrosion dissolution of amorphous matrix will occur preferentially in the alloy.This difference is mainly related to the distribution of Zr and be on amorphous substrates and dendrites.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TG139.8

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