AlxFeCoNiCrTi系高熵合金的组织结构及电化学性能研究

Microstructure and Electrochemical Properties of Alx FeCoNiCrTi High-Entropy Alloys

研究了不同Al含量的AlxFeCoNiCrTi(x:摩尔比;x=0.5,1,1.5,2)多主元高熵合金的组织结构及其在0.5MH2SO4溶液和1MNaCl溶液中的电化学性能,并与市售304不锈钢以及AlFeCuCoNiCrTix高熵合金进行对比。结果表明,随Al的添加,合金组织结构逐渐由FCC相和BCC相组成变为单一的BCC相。极化曲线测试结果表明,在0.5MH2SO4溶液以及1MNaCl溶液中,该系合金耐腐蚀性要明显优于市售304不锈钢及AlFeCuCoNiCrTix高熵合金,而其中AlFeCoNiCrTi合金具有最优越的综合耐腐蚀性能。

Alloys with composition of AIxFeCoNiCrTi （x：molar ratio; x=0.5, 1, 1.5, 2） were designed by using of the strategy of equiatomic ratio and high entropy of mixing. Their microstructure and electrochemical corrosion in 0.5 M H2SO4 solution and 1 M NaCl solution were examined, furthermore, their electrochemical corrosion were compared with 304 stainless steel and AlxFeCoNiCrTi high-entropy alloys. The results show that the composition of the alloy system is gradually changed from FCC phase and BCC phase to a single BCC phase with the addition of Al. The polarization curves show that the alloy system has the better corrosion resistance than 304 stainless steel and AlxFeCoNiCrTi high-entropy alloys in 0.5 M H2SO4 solution and 1 M NaCl solution, and that the AIFeCoNiCrTi alloy has the best comprehensive corrosion resistance.