Effects of Annealing on Microstructure, Mechanical and Electrical Properties of AlCrCuFeMnTi High Entropy Alloy
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2013年第6期
论文作者：NONG Zhisheng ZHU Jingchuan YANG Xiawei YU Hailing LAI Zhonghong
文章页码：1196 - 1200
摘 要：The multi-component AlCrCuFeMnTi high entropy alloy was prepared using a vacuum arc melting process. Serial annealing processes were subsequently performed at 590 ℃, 750 ℃, 955 ℃ and 1 100 ℃ respectively with a holding time of 4 h at each temperature. The effects of annealing on microstructure, mechanical and electrical properties of as-cast alloy were investigated by using differential thermal analysis（DTA）, X-ray diffraction（XRD）, scanning electron microscopy（SEM） and transmission electron microscopy（TEM）. The experimental results show that two C14 hexagonal structures remain unchanged after annealing the as-cast AlCrCuFeMnTi alloy specimens being heated to 1 100 ℃. Both annealed and as-cast microstructures show typical cast-dendrite morphology and similar elemental segregation. The hardness of alloys declines as the annealing temperature increases while the strength of as-cast alloy improves obviously by the annealing treatment. The electrical conductivities of annealed and as-cast alloys are influenced by the distribution of interdendrite regions which is rich in Cu element.
NONG Zhisheng1,2，ZHU Jingchuan1,2，YANG Xiawei1,2，YU Hailing1，LAI Zhonghong1
1. School of Materials Science and Engineering,Harbin Institute of Technology2. National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology
摘 要：The multi-component AlCrCuFeMnTi high entropy alloy was prepared using a vacuum arc melting process. Serial annealing processes were subsequently performed at 590 ℃, 750 ℃, 955 ℃ and 1 100 ℃ respectively with a holding time of 4 h at each temperature. The effects of annealing on microstructure, mechanical and electrical properties of as-cast alloy were investigated by using differential thermal analysis（DTA）, X-ray diffraction（XRD）, scanning electron microscopy（SEM） and transmission electron microscopy（TEM）. The experimental results show that two C14 hexagonal structures remain unchanged after annealing the as-cast AlCrCuFeMnTi alloy specimens being heated to 1 100 ℃. Both annealed and as-cast microstructures show typical cast-dendrite morphology and similar elemental segregation. The hardness of alloys declines as the annealing temperature increases while the strength of as-cast alloy improves obviously by the annealing treatment. The electrical conductivities of annealed and as-cast alloys are influenced by the distribution of interdendrite regions which is rich in Cu element.
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