卢一平

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教授

博士生导师

硕士生导师

主要任职:材料科学与工程学院院长、党委副书记

其他任职:辽宁省高熵合金材料工程研究中心常务副主任、大连理工大学滇西产业发展研究院先进材料制备及装备技术工程研究中心主任

性别:男

毕业院校:西北工业大学

学位:博士

所在单位:材料科学与工程学院

学科:材料加工工程. 材料学. 材料物理与化学

办公地点:辽宁省凝固控制与数字化制备技术重点实验室315室

联系方式:0411-84709400

电子邮箱:luyiping@dlut.edu.cn

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Microstructure and Mechanical Properties of a CoFeNi2V0.5Nb0.75 Eutectic High Entropy Alloy in As-cast and Heat-treated Conditions

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论文类型:期刊论文

发表时间:2016-03-01

发表刊物:JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY

收录刊物:SCIE、EI、ISTIC

卷号:32

期号:3

页面范围:245-250

ISSN号:1005-0302

关键字:High entropy alloy; Microstructure; Thermal stability; Age hardening

摘要:The eutectic CoFeNi2V0.5Nb0.75 high entropy alloys (HEAs) were heated at 500, 600, 700, 800 and 1000 degrees C, respectively for 6 h and subsequently quenched in the water to investigate their thermal stability and phase transformation at high temperature. The microstructure and mechanical properties of the samples were investigated by scanning electron microscopy, X-ray diffraction, compressive and hardness tests. It was found that the as-cast CoFeNi2V0.5Nb0.75 HEAs showed a eutectic microstructure with alternating fcc solid solution phase and Fe2Nb-type Laves phase. The NbNi4-type intermetallic phase appeared when the heat-treated temperature was higher than 600 degrees C. With increasing quenching temperature, the volume fraction of the NbNi4-type intermetallic phase increased while that of the eutectic regions decreased. The sample quenched at 800 degrees C showed the most excellent comprehensive mechanical properties; its fracture strength, yield strength and plastic strain were as high as 2586.76 MPa, 2075.18 MPa and 16.73%, respectively. Moreover, the eutectic CoFeNi2V0.5Nb0.75 HEAs exhibited apparent age hardening, especially quenched at 700 degrees C, the hardness reached up to the maximum value of HV 727.52. Copyright (C) 2015, The editorial office of Journal of Materials Science & Technology. Published by Elsevier Limited. All rights reserved.