本文選題：銅鋯基非晶合金　切入點(diǎn)：顯微組織　出處：《西安工業(yè)大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：銅鋯基非晶復(fù)合材料具有的高強(qiáng)度,高硬度等力學(xué)特性使其在航空航天、電子行業(yè)等領(lǐng)域具有極大的應(yīng)用潛質(zhì)。研究不同組元、不同成分對(duì)不同合金系組織與力學(xué)性能的影響具有重要意義。本文采用真空電弧熔煉-銅模吸鑄、感應(yīng)熔煉-銅模噴鑄法制備了Cu-Zr-Al系合金和Cu-Zr-Al-Y系合金楔形樣品,采用X射線(xiàn)衍射儀(XRD)對(duì)合金的組織結(jié)構(gòu)進(jìn)行分析,通過(guò)差示量熱儀(DSC)研究不同元素添加對(duì)合金玻璃形成能力的影響,利用金相分析、掃描電鏡分析(SEM)、透射電鏡分析(TEM)和能譜分析組織形態(tài)和組織成分,通過(guò)室溫壓縮實(shí)驗(yàn)和顯微硬度實(shí)驗(yàn)對(duì)合金系的力學(xué)性能進(jìn)行測(cè)試,并對(duì)斷口形貌進(jìn)行分析。對(duì)Cu50-0.5xZr50-0.5xAlx(x=2,4,6 at.%)合金的組織和力學(xué)性能的研究表明:在此研究范圍內(nèi),隨著Al含量的增加,合金的玻璃形成能力逐漸增強(qiáng),當(dāng)Al的含量為6 at.%時(shí),Cu47Zr47Al6合金具有較強(qiáng)的玻璃形成能力,其過(guò)冷液相區(qū)寬度達(dá)到61.38K,Trg和γ參數(shù)分別為0.5997和0.4077,并且液相線(xiàn)溫度降至1168.75K。隨著冷卻速率的下降,非晶體中逐漸析出CuZr(B2)相、板條狀CuZr(B19′)相和層片狀的CuZr(Cm)馬氏體相。適量Al的添加可以提高Cu50-0.5xZr50-0.5xAlx(x=2,4,6 at.%)合金的抗壓強(qiáng)度,當(dāng)加入量為4 at.%時(shí)效果最為明顯。在3mm處和5mm處的抗壓強(qiáng)度均隨著Al元素的增加先提高后降低。在3mm處壓縮時(shí),Cu48Zr48Al4合金的抗壓強(qiáng)度達(dá)到2296.0MPa,而且塑性變形量為0.68%。隨著冷卻速率的下降,從3mm到7mm處,合金Cu50-0.5xZr50-0.5xAlx(x=2,4,6 at.%)的顯微硬度數(shù)值依次下降,其中在3mm處的顯微硬度值最高,當(dāng)x=4時(shí),達(dá)到535.2HV。對(duì)(Cu47Zr47Al6)100-xYx(x=0.5,1,1.5,2,2.5 at.%)合金的研究表明:添加適量的Y可以提高合金的玻璃形成能力,且隨著Y含量的增加,合金的玻璃形成能力先提高后下降。當(dāng)Y的含量為2.0 at.%時(shí),(Cu47Zr47Al6)98Y2合金的非晶形成能力最強(qiáng),其過(guò)冷液相區(qū)寬度達(dá)到67.56K。隨著冷卻速率的下降,組織的變化為:完全非晶區(qū)→非晶+B2-CuZr相→非晶+B2-CuZr相+CuZr馬氏體相。添加適量的Y可以提高其抗壓強(qiáng)度,斷裂方式仍為脆性斷裂。隨著Y含量的增加,合金的抗壓強(qiáng)度值先增加后降低,當(dāng)Y含量為2 at.%時(shí),(Cu47Zr47Al6)98Y2合金的抗壓強(qiáng)度達(dá)到最大值1967.9MPa。從3mm到7mm處,顯微硬度數(shù)值依次下降。在3mm處,(Cu47Zr47Al6)98Y2合金的顯微硬度值達(dá)到581.0HV。
[Abstract]:The high strength, high hardness and other mechanical properties of Cu-Zr based amorphous composites make them have great application potential in aerospace, electronics and other fields. The effect of different composition on the microstructure and mechanical properties of different alloy systems is significant. In this paper, the wedge-shaped samples of Cu-Zr-Al series and Cu-Zr-Al-Y series alloys were prepared by vacuum arc melting and copper mould suction casting, induction smelting and copper mold spray casting. The microstructure of the alloy was analyzed by X-ray diffractometer (XRD). The effect of different elements on the glass forming ability of the alloy was studied by differential calorimeter (DSC), and metallographic analysis was used. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) were used to analyze the microstructure and composition of the alloy. The mechanical properties of the alloy were tested by compression test at room temperature and microhardness test. The microstructure and mechanical properties of the alloy Cu50-0.5xZr50-0.5xZr50-0.5xAlxAXO2H2AXZO2AZO4AT.Y.) are studied. The results show that the glass-forming ability of the alloy increases with the increase of Al content in this study range, and the microstructure of the alloy increases with the increase of Al content. When Al content is 6 at.%, Cu47Zr47Al6 alloy has strong glass-forming ability. The width of supercooled liquid region is 0.5997 and 緯 parameter is 0.5997 and 0.4077 respectively, and the liquid line temperature drops to 1168.75K. with the decrease of cooling rate, CuZrB2) phase is gradually precipitated in amorphous. The compressive strength of Cu50-0.5xZr50-0.5xZr50-0.5xZr50-0.5xAlxOXO2AXUXUX 4AZO4AT. 6A) alloy can be improved by adding appropriate amount of Al to the laminated CuZrB19) phase and lamellar CuZrCm) phase, and the compressive strength of the alloy can be improved. The compressive strength of Cu48Zr48Al4 alloy increased first and then decreased with the increase of Al element at 3mm and 5mm. The compressive strength of Cu48Zr48Al4 alloy reached 2296.0MPa and the plastic deformation reached 0.68MPa when compressed at 3mm. The decrease in cooling rate, From 3 mm to 7 mm, the microhardness values of the alloy Cu50-0.5xZr50-0.5xAlxNix2A1XA2At.) decreased in turn, among which the microhardness at 3mm was the highest, reaching 535.2HV when x = 4:00. The study on the alloy Cu _ (47) Zr _ (47) Al _ (47) Al _ (6) Li _ (100) Y _ (0.51) (1. 522) at.showed that the glass-forming ability of the alloy could be improved by adding appropriate amount of Y, and the results were as follows: (1) the glass forming ability of the alloy could be improved by adding appropriate amount of Y to the alloy. With the increase of Y content, the glass-forming ability of the alloy first increased and then decreased. When the content of Y was 2.0 at.%, the amorphous forming ability of Cu47Zr47Al6H98Y2 alloy was the strongest, and the width of the supercooled liquid zone reached 67.56K. with the decrease of cooling rate, The change of microstructure is: completely amorphous region. 鈫扐morphous B 2-CuZr phase. 鈫扵he compressive strength of amorphous B2-CuZr phase CuZr martensite can be increased by adding appropriate amount of Y, and the fracture mode is still brittle fracture. With the increase of Y content, the compressive strength of the alloy increases first and then decreases. When the content of Y is 2 at.%, the compressive strength of Cu47Zr47Al6H98Y2 alloy reaches the maximum 1967.9MPa. From 3mm to 7mm, the microhardness value decreases in turn. At 3mm, the microhardness of Cu47Zr47Al6H98Y2 alloy reaches 581.0HV.
【學(xué)位授予單位】：西安工業(yè)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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