本實驗是在研究CrFeCoNiNbxMoy高熵合金的微結構及腐蝕性質，實驗合金包括CrFeCoNiNb0.75Mo0.25、CrFeCoNiNb0.25Mo0.75、CrFeCoNiNb0.15Mo0.15及CrFeCoNiNb0.3Mo0.3。研究這些合金的微結構，以SEM及XRD儀器進行微結構的分析，以硬度試驗機進行硬度的測試。再以恆電流/恆電位儀測量此三種合金在不同溫度下以四種溶液腐蝕之極化測試，溶液分別為1M之除氧HNO3、H2SO4、HCl、NaCl以測得其腐蝕電流密度、腐蝕電位、鈍態區間電位。完成CrFeCoNiNbxMoy高熵合金塊材的微結構分析及極化曲線研究，歸納此合金的微結構、硬度、以及對硫酸、硝酸、鹽酸及氯化鈉之腐蝕性質，以及這些合金的微結構及特性。
This thesis studied the microstructures, hardness and polarization behaviors of CrFeCoNiNbxMoy high-entropy alloys. The experimental alloys included CrFeCoNiNb0.75Mo0.25、CrFeCoNiNb0.25Mo0.75、CrFeCoNiNb0.15Mo0.15及CrFeCoNiNb0.3Mo0.3 high-entropy alloys. The microstructures of these alloys were observed by a scanning electron microscope, and their phases were identified by an X-ray diffractometer, and hardness of these alloys were measured by a Vicker’s hardness tester. Also, the corrosion behaviors of these alloys were tested by a potentiostat/galvanostat instruments under different temperatures, and the solutions were 1M deaerated H2SO4, HNO3, HCl and NaCl solutions. The corrosion properties of these alloys, such as corrosion current densities, corrosion potentials and passivation region, were done and related with the microstructures.
