蒋淑英.AlCoCrFeNi高熵合金铸态与退火态的耐蚀性研究[J].稀有金属材料与工程,2018,47(10):3191~3196.[JIANG Shu-ying.Study on Corrosion Resistance of the As-cast and Annealed AlCoCrFeNi High-entropy Alloys[J].Rare Metal Materials and Engineering,2018,47(10):3191~3196.]
AlCoCrFeNi高熵合金铸态与退火态的耐蚀性研究
投稿时间:2017-01-11  修订日期:2018-09-20
中文关键词:  AlCoCrFeNi高熵合金  退火  微观组织  耐蚀性
基金项目:山东省自然科学基金(ZR2016EMM22)
中文摘要:
      采用真空电弧熔炼法熔炼出AlCoCrFeNi高熵合金,并在600℃、800℃、1000℃下进行了真空退火处理。利用XRD、SEM、EDS和电化学腐蚀试验对合金退火前后的微观组织以及在3.5%的NaCl溶液、0.5mol/L的NaOH溶液、0.5mol/L的H2SO4溶液中的耐蚀性进行了研究。组织分析表明合金在铸态和三种温度的退火态下均没有复杂结构的脆性金属间化合物生成;在铸态和600℃、800℃退火处理后合金均由简单的BCC结构构成,成树枝晶形态;在1000℃退火处理后,树枝晶消失,微观组织转变为短棒状的FCC析出相和BCC基体交替排列;在铸态及三种温度的退火态下,Co、Fe、Ni分布较均匀,Cr、Al存在一定的偏析,Al在铸态偏析最严重,Cr在800℃退火态偏析最严重。电化学腐蚀试验结果表明铸态和三种温度退火态的AlCoCrFeNi 合金在 3.5%的 NaCl 溶液和0.5mol/L 的 NaOH 溶液中的耐蚀性优良;在 3.5%的 NaCl 溶液中1000℃退火态的耐蚀性最好;在0.5mol/L 的 NaOH 溶液中,4种状态的合金耐蚀性相差不大;在 0.5mol/L H2SO4 溶液中,4种状态的合金都发生了钝化现象,1000℃退火态维钝电流密度最小,破钝电位最高,耐蚀性最好。
Study on Corrosion Resistance of the As-cast and Annealed AlCoCrFeNi High-entropy Alloys
英文关键词:AlCoCrFeNi High-entropy Alloy  annealing  microstructure  corrosion resistance
英文摘要:
      AlCoCrFeNi high entropy alloy was prepared by vacuum arc melting furnace and annealed at 600 ℃, 800 ℃ and 1000 ℃ for 10h. The microstructure of the alloys before and after annealing and their ?corrosion resistance in 3.5% NaCl solution, 0.5 mol/L NaOH solution and 0.5 mol/L H2SO4 solution were studied Using XRD, SEM, EDS and electrochemical corrosion test. Organizational analysis shows that there is no complex intermetallic compound in as-cast and annealing states; the alloys in as-cast and 600 ℃ and 800 ℃ annealing states are composed of simple BCC crystal structure and have the branch crystal morphology; in 1000 ℃ annealing state the alloy consists of BCC + FCC and Short rod-like FCC precipitate phase and BCC substrates arrange alternately; in as-cast and three temperature annealing states, Co, Fe and Ni distributions are uniform and Cr, Al are certain segregation; Al segregation in as-cast is the most serious and Cr segregation in 800 ℃ annealing state is the most serious. Electrochemical corrosion test results show that AlCoCrFeNi alloys in as-cast and three temperature annealing states have excellent corrosion resistance in 3.5% NaCl solution and 0.5 mol/L NaOH solution; in 3.5% NaCl solution, the 1000 ℃ annealing alloy has the best corrosion resistance; in 0.5 mol/L NaOH solution, the four states of the alloy have similar corrosion resistance; in 0.5 mol/L H2SO4 solution, the four states of the alloy have occurred the phenomenon of passivation and 1000 ℃ annealing state has the minimum dimension passive current density and the highest break blunt potential, and its corrosion resistance is best.
作者单位E-mail
蒋淑英 中国石油大学(华东)机电学院 jsyjsy1225@163.com 
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