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农智升,李宏宇,王继杰.AlCrFeNiTi高熵合金热稳定性的研究[J].稀有金属材料与工程(英文),2018,47(1):191~196.[Nong Zhisheng,Li Hongyu,Wang Jijie.The investigation on thermal stability of AlCrFeNiTi high entropy alloy[J].Rare Metal Materials and Engineering,2018,47(1):191~196.]
The investigation on thermal stability of AlCrFeNiTi high entropy alloy
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Received:November 12, 2015  Revised:February 02, 2016
DOI:
Key words: AlCrFeNiTi high entropy alloy  Thermal stability  Artificial neural network
Foundation item:辽宁省博士启动基金资助(项目号201501079);辽宁省高校本科人才培养模式改革项目资助(项目号018-1502153601)
Author NameAffiliationE-mail
Nong Zhisheng School of Materials Science and Engineering,Shenyang Aerospace University nzsfir@126.com 
Li Hongyu School of Materials Science and Engineering,Shenyang Aerospace University  
Wang Jijie School of Materials Science and Engineering,Shenyang Aerospace University  
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Abstract:
      In order to explore the thermal stability of AlCrFeNiTi high entropy alloy, the as-cast AlCrFeNiTi high entropy alloy was synthesized by the vacuum arc melting under an argon atmosphere, and the hardness change of alloy in different heat treatments, including heating temperature and holding time was evaluated, and then the relationship between the hardness and microstructures of AlCrFeNiTi alloy was further discussed. Finally, the network model between heat treatments and hardness of AlCrFeNiTi alloy was built by the back propagation artificialSneuralSnetwork (BP-ANN) to predict the hardness of AlCrFeNiTi alloy. The results show that the as-cast AlCrFeNiTi high entropy alloy is composed of two body centered cubic structures, and typical dendrite, interdendrite and eutectic structure (α+β) microstructures are observed. Comparing with as-cast alloy, the microstructures and content of dendrite of alloy under different heating temperature (from 400 to 900℃) and holding time (from 0.5 to 10h) have no significantSchanges, and the hardnesses of these heat treated samples are all higher than HV400, which indicates the AlCrFeNiTi high entropy alloy has a good thermal stability. Furthermore, the established BP-ANN between heat treatments and hardness of AlCrFeNiTi alloy shows better precision and applicability and can be used to guide the industrial applications.