本文選題：高熵合金　切入點：氬弧熔覆　出處：《遼寧工程技術(shù)大學(xué)》2015年碩士論文

【摘要】：被廣泛關(guān)注的高熵合金突破了傳統(tǒng)合金設(shè)計理論的桎梏,以其簡單的結(jié)構(gòu)、優(yōu)異的性能被眾多研究者看作是極具應(yīng)用潛力的表面熔覆材料。本文采用氬弧熔覆的方法,在06Cr19Ni10不銹鋼表面制備CoCrFeMnNi系高熵合金熔覆涂層。計算該體系各高熵合金的原子半徑差參數(shù)、混合焓與混合熵,并綜合二因素、三因素對各高熵合金的相形成進行定性預(yù)測。采用X射線衍射儀、掃描電鏡、能譜儀、顯微硬度計等設(shè)備分別對CoCrFeMnNbxNi、 CoCrFeMnMoxNi、CoCrFeMnNiWx (x=0.5,1.0,1.5,2.0;摩爾比)高熵合金涂層的組織結(jié)構(gòu)、微區(qū)成分、顯微硬度進行系統(tǒng)研究,并對其耐磨性、耐蝕性進行探討。研究表明：經(jīng)二因素,三因素計算,CoCrFeMnNbxNi、CoCrFeMnMoxNi、CoCrFeMnNiWx(x=0.5, 1.0,1.5,2.0)三個體系的高熵合金全部符合固溶體型高熵合金的范圍。CoCrFeMnNbxNi高熵合金涂層主要由FCC固溶體與Laves相構(gòu)成。CoCrFeMnNbNi、 CoCrFeMnNb1.5Ni高熵合金涂層中片層狀團簇組織的片層間距可達納米級別,后者有納米級別的顆粒組織析出。硬度最高的CoCrFeMnNb2Ni高熵合金涂層的平均顯微硬度可達700HV0.2以上。該體系所有高熵合金涂層的耐磨性均優(yōu)于06Cr19Ni10的,CoCrFeMnNb2Ni高熵合金涂層耐磨性最佳。在質(zhì)量分數(shù)為3.5%的NaCl溶液中,該體系所有高熵合金涂層的耐蝕性均優(yōu)于06Cr19Ni10的。耐蝕性最佳的CoCrFeMnNb1.5Ni高熵合金涂層的自腐蝕電流密度比06Cr19Ni10、一個數(shù)量級。CoCrFeMnMoxNi高熵合金涂層主要由FCC固溶體與Rhombohedral固溶體構(gòu)成。CoCrFeMnMoNi高熵合金涂層的片層狀團簇組織的片層間距為亞微米級別至納米級別。CoCrFeMnMo1.5Ni高熵合金涂層最精細區(qū)域組織的片層間距可達120nm左右。CoCrFeMnMo2Ni高熵合金涂層中有納米組織析出。硬度最高的CoCrFeMnMo2Ni高熵合金涂層的平均顯微硬度可達700 HV0.2以上。該體系所有高熵合金涂層的耐磨性均優(yōu)于06Crl9Ni10的,CoCrFeMnMoNi、CoCrFeMnMo2Ni高熵合金涂層均具有較佳的耐磨性,CoCrFeMnMo2Ni高熵合金涂層耐磨性最佳。在質(zhì)量分數(shù)為3.5%的NaCl溶液中,該體系所有高熵合金涂層的耐蝕性均優(yōu)于06Cr19Ni10的。CoCrFeMnMo1.5Ni、CoCrFeMnMo2Ni高熵合金涂層的自腐蝕電流密度均比06Cr19Ni10小一個數(shù)量級,后者可以在介質(zhì)中鈍化。CoCrFeMnNiWx高熵合金涂層主要由FCC固溶體、η相與M23C6構(gòu)成。CoCrFeMnNi W、 CoCrFeMnNiW1.5高熵合金涂層中η相、M23C6分別與FCC固溶體形成兩種魚骨狀共晶體,但后者的顯微組織更加精細,CoCrFeMnNiW2高熵合金涂層中粗大化的η相單獨析出。硬度最高的CoCrFeMnNiW1.5、CoCrFeMnNiW2高熵合金涂層的平均顯微硬度均在700 HV0.2以上。該體系所有高熵合金涂層的耐磨性均優(yōu)于06Cr19Ni10的,CoCrFeMnNiW、 CoCrFeMnNiW1.5、CoCrFeMnNiW2高熵合金涂層均具有優(yōu)異的耐磨性,CoCrFeMnNiW2高熵合金涂層耐磨性最佳。在質(zhì)量分數(shù)為3.5%的NaCl溶液中,除CoCrFeMnNiW高熵合金涂層外,該體系其它涂層的自腐蝕電流密度與06Cr19Ni10均在同一數(shù)量級上。
[Abstract]:The high entropy alloy, which has been widely concerned, has broken through the shackles of the traditional alloy design theory. With its simple structure and excellent properties, it is regarded by many researchers as a surface cladding material with great potential for application. In this paper, argon arc cladding method is used. CoCrFeMnNi system high entropy alloy cladding coating was prepared on the surface of 06Cr19Ni10 stainless steel. The atomic radius difference parameters, mixing enthalpy and mixing entropy of each high entropy alloy in the system were calculated, and two factors were synthesized. Three factors were used to predict the phase formation of high entropy alloys qualitatively. The microstructure and microstructures of CoCrFeMnNbxNix CoCrFeMnMoxNix CoCrFeMnNix 0.5NWx CoCrFeMnNix and CoCrFeMnNiWx (1.52.0mol) high entropy alloy coatings were determined by X-ray diffractometer, scanning electron microscope, energy spectrometer and microhardness tester respectively. The microstructure and microstructures of CoCrFeMnNbxNix, CoCrFeMnMoxNixNix and CoCrFeMnNixNix were determined. The microhardness was studied systematically, and the wear resistance and corrosion resistance were discussed. Three-factor calculation of CoCrFeMnNbxNiC0CrFeMnMoxNiCoCrFeMnMoxNiCoCrFeMnNiWxHX 0.5, 1.0 ~ 1.52.0) the high entropy alloy all accord with the range of solid solution-type high entropy alloy. CoCrFeMnNbxNi high entropy alloy coating is mainly composed of FCC solid solution and Laves phase. CoCrFeMnNbNi. the interlaminar structure of lamellar clusters in CoCrFeMnNb1.5Ni high entropy alloy coating. Up to the nanoscale level, The average microhardness of the CoCrFeMnNb2Ni high entropy alloy coating with the highest hardness is over 700HV0.2. The wear resistance of all high entropy alloy coatings in this system is better than that of the CoCrFeMnNb2Ni high entropy alloy coating with 06Cr19Ni10. In 3.5% NaCl solution, The corrosion resistance of all high entropy alloy coatings in this system is better than that of 06Cr19Ni10. The self-corrosion current density ratio of CoCrFeMnNb1.5Ni high entropy alloy coating with the best corrosion resistance is 06Cr19Ni10. An order of magnitude. CoCrFeMnMoxNi high entropy alloy coating is mainly composed of FCC solid solution and Rhombohedral solid solution. CoCrFeMnMoNi High Entropy Alloy CoCrFeMnMoNi High Entropy Alloy CoCrFeMnMo1.5Ni High Entropy Alloy CoCrFeMnMo1.5Ni High Entropy Alloy CoCrFeMnMo1.5Ni High Entropy Alloy coating has a layer spacing of sub-micron to nanocrystalline. The interlamellar spacing of the fine area of CoCrFeMnMoNi high entropy alloy coating can reach about 120nm. CoCrFeMnMo2Ni high entropy alloy coating has nanostructure precipitated. The average microhardness of the CoCrFeMnMo2Ni high entropy alloy coating with the highest hardness can be more than 700 HV0.2. The wear resistance of all high entropy alloy coatings in this system is better than that of the CoCrFeMnMoNiCoCrMnMo2Ni high entropy alloy coating with 06Crl9Ni10. The wear resistance of the CoCrFeMnMo2Ni high entropy alloy coating is better than that of the 06Crl9Ni10 CoCrFeMnMo2Ni high entropy alloy coating. Wear resistance is the best. In 3.5% NaCl solution, The corrosion resistance of all high-entropy alloy coatings in this system is better than that of the CoCrFeMnMo1.5NiCoCrFeMnMo2Ni high entropy alloy coating with 06Cr19Ni10. The self-corrosion current density of the CoCrFeMnMo1.5NiCoCrFeMnMo2Ni high entropy alloy coating is one order of magnitude smaller than that of 06Cr19Ni10. The latter can passivate. CoCrFeMnNiWx high entropy alloy coating is mainly composed of FCC solid solution, 畏 phase and M23C6. 畏 phase M23C6 in CoCrFeMnNiW1.5 high entropy alloy coating and FCC solid solution form two kinds of fishbone eutectic, respectively. However, the microstructure of CoCrFeMnNiW2 high entropy alloy coating is more fine and the coarse 畏 phase is precipitated separately. The average microhardness of CoCrFeMnNiW1.5 and CoCrFeMnNiW2 high entropy alloy coating with the highest hardness is more than 700 HV0.2. The resistance of all high entropy alloy coatings in this system is more than 700 HV0.2. CoCrFeMnNiW, CoCrFeMnNiW1.5 and CoCrFeMnNiW2 high entropy alloy coatings all have excellent wear resistance. The wear resistance of CoCrFeMnNiW2 high entropy alloy coating is the best. In the NaCl solution with 3.5% mass fraction of CoCrFeMnNiW2, the wear resistance of CoCrFeMnNiW2 is better than that of CoCrFeMnNiW1.The wear resistance of CoCrFeMnNiW2 high entropy alloy coating is the best. With the exception of CoCrFeMnNiW high entropy alloy coating, the corrosion current density of the other coatings is in the same order of magnitude as that of 06Cr19Ni10.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG174.4

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本文編號：1685658