本文選題：塊體非晶合金 + 力學性能　； 參考：《蘭州理工大學》2017年碩士論文

【摘要】：由于鋯基非晶合金優(yōu)異的力學性能和不同于晶態(tài)金屬材料的結構,人們對它的研究興趣愈來愈濃厚。但是鋯基塊體金屬玻璃作為結構材料在具有諸多優(yōu)異性能的同時也存在一些問題,比如脆性斷裂問題,非晶合金具有塑性時的結構問題,以及非晶合金制備時外部條件對其性能影響的問題等都是目前非晶合金急需解決的。本文延續(xù)課題組前期的研究工作,通過對(Zr_(0.761)Cu_(0.147)Ni_(0.092))92-x Al8+x、(Zr_(0.72)Cu_(0.278)Ag_(0.002))_(88)Al_(12)、(Zr_(0.72)Cu_(0.165)Ni_(0.115))88Al12等鋯基塊體非晶合金采用X射線衍射,差熱分析,室溫壓縮實驗和顯微硬度測試等方式對它們的力學性能和微觀結構進行測試分析,得到以下結果:(1)通過對(Zr_(0.761)Cu_(0.147)Ni_(0.092))92-x Al8+x非晶合金Al元素的調整,得到了大尺寸的具有較好塑性的(Zr_(0.761)Cu_(0.147)Ni_(0.092))_(92)Al_(10)非晶合金。合金直徑3mm試樣塑性變形εp達到了15.82%,且此成分具有較好的非晶成形能力,過冷液相區(qū)ΔTx達到了94K;并且隨著Al含量的增加,(Zr_(0.761)Cu_(0.147)Ni_(0.092))92-x Al8+x合金的屈服強度和顯微硬度都有所增加,且當x=6時達到最大的1713MPa和4096MPa。(2)通過對(Zr_(0.761)Cu_(0.147)Ni_(0.092))92-x Al8+x非晶合金混合焓ΔH_(mix)和混合熵ΔS_(mix)的計算,發(fā)現(xiàn)當ε越接近1,合金的熱穩(wěn)定性越好;通過對合金塑性變形時產生的鋸齒流變行為進行統(tǒng)計分析發(fā)現(xiàn),隨著塑性應變的持續(xù),合金鋸齒流變中應力降幅Δσs波動越穩(wěn)定,則合金塑性越好,反之當合金應力降幅波動越來越大,則合金越容易失穩(wěn),塑性越小;通過對腐蝕后的(Zr_(0.761)Cu_(0.147)Ni_(0.092))92-x Al8+x非晶合金試樣進行顯微硬度測試,發(fā)現(xiàn)硬度在合金軟硬區(qū)的顯微硬度不同,且兩者硬度差值越大,則合金塑性越好。(3)通過快速凝固,得到不同冷卻速率下的(Zr_(0.72)Cu_(0.278)Ag_(0.002))_(88)Al_(12)合金試樣,通過對試樣進行室溫壓縮實驗。發(fā)現(xiàn),隨著冷卻速率的下降,合金的塑性明顯降低,在6mm時發(fā)生脆斷,與之相反的是,非晶合金的強度卻顯著增大(6mm試樣晶化,較大的晶粒使其強度顯著降低)。通過對塑性較好2mm試樣進行腐蝕并結合背散射電子分析發(fā)現(xiàn),腐蝕表面出現(xiàn)了類似網狀結構。通過分析發(fā)現(xiàn),網的產生是由于合金被腐蝕掉的結構相較于基體更易腐蝕,結構更加“松散”,也就是非晶合金中微觀結構不均勻。而通過對具有較好塑性的(Zr_(0.72)Cu_(0.165)Ni_(0.115))88Al12非晶合金3mm試樣進行納米壓痕測試,這一猜測得到證實。(4)通過對鑄態(tài)(Zr_(0.72)Cu_(0.278)Ag_(0.002))_(88)Al_(12)塊體非晶合金直徑2mm和3mm試樣進行等溫退火處理,經室溫壓縮實驗和顯微硬度測試。結果表明,隨著退火時間的延長,合金2mm試樣塑性逐漸變差,而強度逐漸增大;但3mm試樣塑性和強度卻均是先減小后增大。而合金的顯微硬度不論2mm試樣還是3mm試樣都隨著退火時間的延長而增大,而且兩者之間呈線性關系。
[Abstract]:Because of the excellent mechanical properties and structure of zirconium based amorphous alloys, people are more and more interested in the research of zirconium based amorphous alloys. However, as a structural material, zirconium based bulk metallic glass has many excellent properties, such as brittle fracture, structural problems when amorphous alloy is plastic. The problems of the influence of external conditions on the properties of amorphous alloys are urgently needed to be solved. This paper continues the previous research work of the research group. By using X-ray diffraction, differential thermal analysis (DTA) is used to analyze Zr-based bulk amorphous alloys, such as 0.147NII Al8 0.272 Al8, 0.272 Al8, 0.278Ag-DTA, 0.278Agtix, 0.278Ag-DX, 0.278Ag-DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA, DTA The mechanical properties and microstructure of these alloys were tested and analyzed by means of room temperature compression test and microhardness test. The following results were obtained: 1) the adjustment of Al elements in amorphous alloy 92-x Al8 x was carried out by adjusting the Al element of the amorphous alloy. A large-size amorphous alloy with a good plasticity of 0.761Cu+ / 0.147N / Nitig / 0.092 / T / T / 92AlC10) has been obtained. The plastic deformation 蔚 p of alloy diameter 3mm specimen has reached 15.82, and this component has better amorphous forming ability, 螖 Tx in undercooled liquid phase reaches 94 K, and the yield strength and microhardness of Al8 x alloy increase with the increase of Al content. When x = 6 reaches the maximum 1713MPa and 4096MPa.f2) through the calculation of the mixture enthalpy 螖 H mixed and the mixed entropy 螖 S / S mixture of the 1713MPa and 4096 MPa.f2), it is found that the thermal stability of the alloy is better when 蔚 is closer to 1. The results show that the heat stability of the alloy is better when 蔚 is closer to 1, and the mixture enthalpy of the amorphous alloy is calculated by means of the calculation of the mixture enthalpy 螖 H ~ (+) and the mixed entropy 螖 S / S _ (+) of the amorphous alloy. Through the statistical analysis of the rheological behavior of the sawtooth during plastic deformation, it is found that the more stable the fluctuation of stress 螖 蟽 s in the rheology of the alloy is, the better the plasticity of the alloy is. On the contrary, when the stress fluctuation of the alloy is more and more large, the instability of the alloy is more easily and the plasticity of the alloy is smaller. By testing the microhardness of the corroded sample of Nijiu 0.092x Al8 x amorphous alloy, it is found that the hardness of the amorphous alloy is different in the soft and hard region of the alloy, and the hardness is different in the hard and soft region of the alloy. Moreover, the greater the hardness difference between them, the better the alloy plasticity. It is found that with the decrease of cooling rate, the plasticity of the alloy decreases obviously, and brittle fracture occurs at 6mm. On the contrary, the strength of the amorphous alloy increases significantly with the crystallization of the 6mm sample, and the strength of the amorphous alloy decreases significantly with the larger grain size. It is found that the corrosion surface of the 2mm specimen with good plasticity is similar to that of the network structure by means of backscatter electron analysis. Through analysis, it is found that the structure of the alloy corroded is more easily corroded than the matrix, and the structure is more "loose", so the microstructure of the amorphous alloy is not uniform. The nanoindentation tests on the 3mm specimens of the amorphous alloy 3mm with better plasticity were carried out. The results show that the as-cast SnZR 0.272 CuV 0.278Ag0.002Ag-0.002Ag-888 Aln12) bulk amorphous alloy diameter 2mm and 3mm samples are annealed by isothermal annealing, and the results are as follows: (1) in this paper, the results are as follows: (1) the as-cast bulk amorphous alloy 2mm and 3mm samples are annealed by isothermal annealing, and the results show that the as-cast amorphous alloy 2mm and 3mm samples are annealed by isothermal annealing. At room temperature compression test and microhardness test. The results show that with the increase of annealing time, the plasticity and strength of 2mm alloy become worse and the strength increases gradually, but the plasticity and strength of 3mm specimen decrease first and then increase. The microhardness of both 2mm and 3mm alloys increases with the increase of annealing time, and there is a linear relationship between them.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG139.8

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