Mechanical Properties Improvement of AlCrFeNi2Ti0.5 High Entropy Alloy through Annealing Design and its Relationship with its Particle-reinforced Microstructures
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2015年第4期
论文作者：Li Jiang Hui Jiang Yiping Lu Tongmin Wang Zhiqiang Cao Tingju Li
文章页码：397 - 402
摘 要：High entropy alloy has attracted increasing attentions.However,to enhance the alloy strength often leads to impairment of the ductility,or vice versa.Here we reported a heat treatment approach on AlCrFeNi2Ti0.5 high entropy alloy,which can elevate the strength and ductility simultaneously.An ingot of AlCrFeNi2Ti0.5 weighing 2.5 kg was firstly fabricated by medium frequency induction melting.Then samples from the same height of the bulk ingot were annealed for 6 h at 600,700,800 and 1000 ℃,respectively.After 1000 ℃ annealing,an optimal microstructure was obtained by using our approach which can make some precipitation particles distribute homogeneously in the dendrite interior while keep the interdendrite structure as a single solid solution phase.The mechanical test on this AlCrFeNi2Ti0.5 alloy sample showed that,the compressive fracture strength σbc was increased by about600 MPa and the plastic strain ep was doubled,compared with those of the as-cast sample.Our approach can be readily adapted to large-scale industrial production of high entropy alloys with high strength and ductility by proper annealing treatment.
Li Jiang，Hui Jiang，Yiping Lu，Tongmin Wang，Zhiqiang Cao，Tingju Li
School of Materials Science and Engineering,Dalian University of Technology
摘 要：High entropy alloy has attracted increasing attentions.However,to enhance the alloy strength often leads to impairment of the ductility,or vice versa.Here we reported a heat treatment approach on AlCrFeNi2Ti0.5 high entropy alloy,which can elevate the strength and ductility simultaneously.An ingot of AlCrFeNi2Ti0.5 weighing 2.5 kg was firstly fabricated by medium frequency induction melting.Then samples from the same height of the bulk ingot were annealed for 6 h at 600,700,800 and 1000 ℃,respectively.After 1000 ℃ annealing,an optimal microstructure was obtained by using our approach which can make some precipitation particles distribute homogeneously in the dendrite interior while keep the interdendrite structure as a single solid solution phase.The mechanical test on this AlCrFeNi2Ti0.5 alloy sample showed that,the compressive fracture strength σbc was increased by about600 MPa and the plastic strain ep was doubled,compared with those of the as-cast sample.Our approach can be readily adapted to large-scale industrial production of high entropy alloys with high strength and ductility by proper annealing treatment.
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