Cr-Fe-Co-Ni-(Nb,Mo)高熵合金之研究

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Title:	Cr-Fe-Co-Ni-(Nb,Mo)高熵合金之研究 The Characteristics of the Cr-Fe-Co-Ni-(Nb,Mo) High-Entropy Alloys
Authors:	陳伯旻 (CHEN, PO-MIN)
Contributors:	化學工程與材料工程學系奈米材料碩士班
Keywords:	高熵合金 High-Entropy Alloys
Date:	2018
Issue Date:	2019-06-10 14:43:54 (UTC+8)
Abstract:	本論文的研究目的為Cr19Fe22Co21Ni25Mo13及Cr27Fe24Co18Ni26Nb5高熵合金的微結構及其電化學性質，本論文以Cr19Fe22Co21Ni25Mo13、Cr27Fe24Co18Ni26Nb5此兩種合金來做研究及探討。這兩個合金的成分是基於本實驗室蔡孟琦學長的研究，從其研究的CrFeCoNiMo及CrFeCoNiNb合金中，取其FCC相的成分來配置，希望能增加合金的加工性，同時維持其耐腐蝕的特性。本實驗再用恆電流/恆電位儀測量Cr19Fe22Co21Ni25Mo13及Cr27Fe24Co18Ni26Nb5合金在除氧環境下的0.5M硫酸、1M鹽酸、1M硝酸及1M氯化鈉溶液中，分別以攝氏30、40、50、60度，測量到的極化曲線來測定其腐蝕電位、腐蝕電流，並相互比較，最後再與30度的304不銹鋼做比較。在除氧環境下的0.5M硫酸、1M鹽酸、1M硝酸及1M氯化鈉溶液中，兩種合金皆會產生鈍態區，但在某些溶液中會因升溫而導致鈍態區消失，同時也會出現腐蝕電位Ecorr及腐蝕電流icorr不穩定的情形。此外，本實驗還觀察熱處理的影響，將兩種合金放入攝氏一千度的高溫爐中，分別加熱2、4、6、24小時。結果顯示，熱處理對Cr27Fe24Co18Ni26Nb5合金沒有影響；而Cr19Fe22Co21Ni25Mo13合金則會產生析出相及時效強化的現象。 The purpose of this thesis is to study the microstructure and electrochemical properties of Cr19Fe22Co21Ni25Mo13 and Cr27Fe24Co18Ni26Nb5 high entropy alloys. The compositions of these two alloys were selected from the FCC phases in the CrFeCoNiMo and CrFeCoNiNb equlmolar alloys to develop the alloys with good corrosion resistance and workability. In this case, the polarization curves of Cr19Fe22Co21Ni25Mo13 and Cr27Fe24Co18Ni26Nb5 alloys in 0.5M sulfuric acid, 1M hydrochloric acid, 1M nitric acid, and 1M sodium chloride solution at 30, 40, 50, and 60 degrees Celsius were measured by a constant current/potentiometric potentiometer. The corrosion potential, corrosion current density, and passivation potential are compared with each other and finally compared with 304 stainless steel. These two alloys generated passivation zone in deaerated 0.5M sulfuric acid, 1M hydrochloric acid, 1M nitric acid, and 1M sodium chloride solutions. However, the passivation zone disappeared because the test temperature increased. This would also cause corrosion potential Ecorr and corrosion current icorr unstable. In addition, we investigated the microstructures and hardness of these alloys after annealing. Annealing had no effect on the Cr27Fe24Co18Ni26Nb5 alloy, but some precipitates were found in Cr19Fe22Co21Ni25Mo13 alloy.
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