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AlCoCrFeNiTi0.5高熵合金的组织控制和腐蚀性能
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国家重点基础研究发展规划“973”项目(2007CB607603)


Microstructure Control and Corrosion Properties of AlCoCrFeNiTi0.5 High-Entropy Alloy
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    摘要:

    研究冷坩埚悬浮熔炼AlCoCrFeNiTi0.5多组元高熵合金的微观组织及回火工艺对合金组织、硬度和电化学性能的影响规律。结果发现,冷坩埚悬浮熔炼AlCoCrFeNiTi0.5高熵合金铸锭中晶粒呈树枝晶长大并析出少量ω相。随回火温度的升高,晶粒长大,共晶组织增多,BCC相强度呈先下降后升高趋势。800 ℃时,合金树枝晶晶粒变得细小,之后随着温度的升高,枝晶间的元素偏析减弱。合金具有较强的抗回火软化能力。在3.5%NaCl溶液中,孔蚀主要集中在树枝晶与共晶组织α相的交接处,回火后合金的耐蚀性均优于铸态合金,700 ℃回火后合金的耐腐蚀性能比铸态及其它合金更强。

    Abstract:

    The microstructures, hardness and electrochemical properties of AlCoCrFeNiTi0.5 high-entropy alloys fabricated by cold crucible levitation melting (CCLM) with as-cast structure and tempering treated structures were investigated. The results show that in contrast to suction casting using copper molds, CCLM causes the growth of dendrite phase and separation of ω phase. As the increase of temperature, the dendrite grains grow up, the amount of eutectic structures increases, and the intensity of BCC peak shows a rising trend after the first drop. At the temperature of 800 ℃, the dendrite grains become refined. And then, as the temperature increases, the element segregation of interdendrite is weakened. The alloy exhibits a superior resistance to tempering and softening property. Furthermore, pitting corrosions are mainly concentrated in the place between dendrite phase and eutectic α phase. The tempering treatment improves corrosion properties in a 3.5% NaCl solution, and the alloy tempered at 700 exhibits the best corrosion property among the experimental alloys.

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于 源,谢发勤,张铁邦,寇宏超,胡 锐,李金山. AlCoCrFeNiTi0.5高熵合金的组织控制和腐蚀性能[J].稀有金属材料与工程,2012,41(5):862~866.[Yu Yuan, Xie Faqin, Zhang Tiebang, Kou Hongchao, Hu Rui, Li Jinshan. Microstructure Control and Corrosion Properties of AlCoCrFeNiTi0.5 High-Entropy Alloy[J]. Rare Metal Materials and Engineering,2012,41(5):862~866.]
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  • 收稿日期:2011-06-26
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