本文選題：非晶合金 + 玻璃形成能力�。� 參考：《湘潭大學(xué)》2017年碩士論文

【摘要】：非晶合金因?yàn)槠洫?dú)特而優(yōu)異的力學(xué)、物理和化學(xué)性能一直被人們廣泛關(guān)注。非晶合金材料在國(guó)防、航空航天、體育和電力等領(lǐng)域都有廣闊的應(yīng)用前景,非晶合金的玻璃轉(zhuǎn)變和納米壓痕蠕變行為都是比較熱門(mén)的研究方向。雖然人們已經(jīng)成功制備出了眾多的非晶合金系,并且其中一部分合金已經(jīng)得到了實(shí)際應(yīng)用,但是非晶合金的較低玻璃形成能力(Glass forming ability, GFA),對(duì)非晶合金室溫下的流變行為研究還不夠全面等缺陷極大地限制了非晶合金的應(yīng)用。研究非晶合金材料的玻璃形成能力GFA和它的納米壓痕蠕變行為對(duì)更好地探索非晶的性能,提高非晶的應(yīng)用前景都具有重要意義。本文文主要工作和結(jié)果總結(jié)如下:1、簡(jiǎn)單介紹了非晶合金材料的研究歷史、性能和應(yīng)用前景和非晶合金的形成機(jī)理與壓痕蠕變行為�；谖墨I(xiàn)總結(jié)了其他學(xué)者研究非晶材料的GFA的方法,如今被廣泛采用的評(píng)估非晶材料的GFA的參數(shù)是臨界冷卻速率Rc和最大直徑Dmax。其中用Rc評(píng)估非晶合金材料的GFA比較準(zhǔn)確,但是目前測(cè)量Rc的步驟繁瑣,對(duì)儀器要求較高;而用最大直徑Dmax來(lái)評(píng)估非晶合金材料的GFA比較簡(jiǎn)單,但是測(cè)量最大直徑Dmax時(shí),受工藝的影響偏差比較大。因此目前主要通過(guò)含有非晶合金材料的玻璃轉(zhuǎn)變溫度(Tg)、晶化開(kāi)始溫度(Tx)、液相線溫度(7l)的判據(jù)來(lái)判斷臨界冷卻速率Rc和最大直徑Dmax的大小,然后通過(guò)Rc和Dmax來(lái)反映非晶合金材料的GFA。2、通過(guò)分析不同判據(jù)△Tx、Trg、γ、△Trg、α、β1、δ、γm,、φ、ξ、β2、ω1、ω3、θ、ω2、γc、β'、ω4、Gp ,然后基于熱力學(xué)和動(dòng)力學(xué)的方法得到新判據(jù)χ,分析各判據(jù)與臨界冷卻速率Rc的相關(guān)性得出:新判據(jù)χ與Rc的相關(guān)性最強(qiáng),能更好的判斷Rc的大小,從而能更好的反映非晶材料的GFA。3、通過(guò)分析判據(jù)與臨界冷卻速率Rc和最大直徑Dmax。相關(guān)性的不同,得出判據(jù)在判斷臨界冷卻速率Rc和最大直徑Dmax。的準(zhǔn)確性上存在差異,本文通過(guò)形核速率和熱穩(wěn)定性分析得到了一個(gè)能更好地判斷最大直徑Dmax大小的新判據(jù)χ。基于統(tǒng)計(jì)數(shù)據(jù)分析結(jié)果發(fā)現(xiàn),判據(jù)χ'與最大直徑Dmax的相關(guān)性最強(qiáng),能更好的判斷最大直徑Dmax的大小,從而反映非晶合金的玻璃形成能力GF4。4、基于分?jǐn)?shù)階Maxwell、kevin和Zener模型,推導(dǎo)得到各模型在保載階段的蠕變位移和時(shí)間關(guān)系式,并通過(guò)這些關(guān)系來(lái)分析在不同加載速率下非晶材料的納米壓痕蠕變行為。我們得到在相同最大載荷下,加載速率的增加會(huì)導(dǎo)致分?jǐn)?shù)階階次α和流動(dòng)單元作用因子ρ均增大,非晶材料表現(xiàn)出更強(qiáng)的粘性特征。
[Abstract]:Amorphous alloy because of its unique and excellent mechanical, physical and chemical properties have been widely concerned. Amorphous alloys in aerospace, defense, sports and power fields have broad application prospects, amorphous alloy and glass transition of nanoindentation creep behavior is a popular research. Although people has successfully prepared amorphous alloys are numerous, and part of the alloy has been applied, but lower the glass forming ability of amorphous alloys (Glass, forming ability, GFA) on the rheological behavior of the amorphous alloy at room temperature are not comprehensive defects greatly limits the application of amorphous study of amorphous alloy. The glass forming ability of GFA alloy material and its nano indentation creep behavior to better explore the properties of amorphous, is of great significance to improve the application prospects of amorphous Ben Wenwen. The main work and results are summarized as follows: 1, this paper introduces the research history of amorphous alloy material, performance and application prospect and the formation mechanism of amorphous alloys and indentation creep behavior. The paper summarizes the methods of other researchers of amorphous materials based on GFA, is now widely used to evaluate the parameters of amorphous materials GFA the critical cooling rate is Rc and the maximum diameter of Dmax. which used Rc evaluation of amorphous alloy GFA is more accurate, but the current measurement Rc cumbersome steps, higher requirement of instrument; and to evaluate the maximum diameter of Dmax amorphous alloy GFA is relatively simple, but the measurement of the maximum diameter of Dmax, the effect of deviation by process relatively large. So at present mainly through the glass transition temperature of amorphous alloy containing materials (Tg), the crystallization temperature (Tx), liquidus temperature (7L) criterion to determine the critical cooling rate of Rc and the maximum diameter of Dmax The size, and then through the Rc and Dmax to reflect the amorphous alloy material of GFA.2, through the analysis of different criteria of Tx, Trg, Trg gamma, Delta, alpha, beta 1, 8, m, gamma, phi, zeta, beta 2, Omega 1, Omega 3, Omega 2 C, theta, gamma, beta 'Omega 4, Gp, and thermodynamic and kinetic methods based on the new criterion of X, analysis of correlations between the criterion and the critical cooling rate of Rc: a new criterion was the strongest correlation with Rc, to determine the size of Rc can be better, can better reflect the amorphous material GFA.3, through the analysis and critical criterion the cooling rate of Rc and the maximum diameter of Dmax. between different criteria in accuracy that the critical cooling rate of Rc and Dmax. in diameter on the differences, through the analysis of the nucleation rate and the thermal stability has been a better judge by new criterion of maximum diameter of Dmax. The size of the statistical data analysis results based on the criterion X and the maximum diameter of the Dmax The strongest, to determine the size of Dmax in diameter can be better, so as to reflect the glass forming ability of amorphous alloys GF4.4, fractional Maxwell based on Kevin and Zener model, deduced creep displacement and time relation of the model in the holding stage, and through the relationship between the nanoindentation creep behavior under different loading rate amorphous materials. We are in the same under the maximum load, the increase of the loading rate leads to fractional order alpha and flow unit factor P increased, amorphous materials exhibit stronger viscous characteristics.

【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TG139.8

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