纳米组织Zr-4合金腐蚀性能研究.docVIP

退火对AlCrFeCoNiCu高熵合金的组织与性能的影响 李安敏 张喜燕2 刘乐林3 郑良杰1 （1.广西大学材料科学与工程学院，南宁，530004； 2.重庆大学材料科学与工程学院，重庆，400030；3. 南南铝业股份有限公司，南宁，530031） 摘要:利用真空电弧炉制备AlCrFeCoNiCu高熵合金，研究合金的铸态与退火态的显微组织与性能。结果表明，合金的铸态组织是树枝晶，显微组织是由具有面心立方结构和体心立方结构的固溶体组成，前者为枝晶间相，富集Cu，同时固溶有Al、Cr、Co、Fe、Ni；后者是由Al、Cr、Co、Fe、Ni几种元素形成，同时固溶少量的Cu。随着退火温度的升高，合金富铜的枝晶间相连成网状，600℃后有金属间化合物产生，显微组织不再是铸态的完全的固溶体。退火温度高于600℃时合金硬度才开始明显下降；铸态合金抗压强度为1.71GPa，800℃退火，合金的抗压强度为1.63GPa，断口属脆性断口。 关键词：退火；高熵合金；显微组织；性能 中图分类号：TG13 文献标志码： A EFFECT OF ANNEALING ON THE STRUCTURE AND propertIES OF THE AlCrFeCoNiCu Multi-component Alloy LI An-min1, ZHANG Xi-yan2, LIU Le-lin3, ZHENG Liang-jie1 (1. College of Material Science and Engineering, Guangxi University, Nanning 530004, China; 2. College of Material Science and Engineering, Chongqing University, Chongqing 400030, China; 3. Alnan aluminium Co., Ltd. Nanning 530031, China) ABSTRACT：AlCrFeCoNiCu multi-component alloy with equimolar constituent elements was prepared in a water-cold copper hearth of vacuum arc furnace. The microstructure and properties of alloy have been studied. The?cast?structure?of?AlCrFeCoNiCu?was?dendritic,?that?included FCC and BCC. Inter-dendrite phase was FCC, which enriched Cu with solution element Al, Cr, Co, Fe and Ni. BCC was a solid solution composed of Al, Cr, Co, Fe, Ni and a few Cu.With the increase of the annealing temperature，the inter-dendrite phase enriched Cu appeared net shape. Some?intermetallic?compounds?were?found?in?the?alloy and the hardness value of the alloy decreased obviously when the annealing temperature was above 600℃. The compression strength of the cast alloy was 1.71GPa, and that of the alloy annealed at 800℃was 1.63GPa.The compression fracture of alloy belonged to brittle fracture. Key words: Anneal; High-entropy alloys; Microstructure; Properties 0引言 高熵合金又称“多主元合金”，就是具有多种主要元素的合金，其中每个主要元素都具有高的原子分数，主要元素数目不少于5个，原子分数皆不超过35％[1-3]。高熵合金具有显微结构简单、不易出现金属间化合物、具有纳米析出物与非晶质结构等特征[1-4]，具有高强度、高硬度、耐回火软化、耐磨、耐蚀等性能特性[5-7]。目前，国内外有关高熵合金显微组织的研究取得了不少的成果；但是大多数研究的是铸态组织，而很