Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第28卷    第1期    总第226期    2018年1月

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文章编号:1004-0609(2018)-01-0135-07
准静态拉伸过程中CoCrFeMnNi高熵合金显微组织的演变
蔡小勇1,唐群华2,戴品强1, 3, 4

(1. 福州大学 材料科学与工程学院,福州 350116; 2. 莆田学院 机电工程学院,莆田 351100; 3. 福建工程学院 材料科学与工程学院,福州 350118; 4. 福建工程学院 福建省新材料制备与成形技术重点实验室,福州 350118)

摘 要: 采用电子背散射衍射技术,研究室温下CoCrFeMnNi高熵合金在准静态单向拉伸(应变速率为1×10-1 s-1)过程中显微组织的演变。结果表明:合金的变形机制主要是位错的滑移,同时伴随着少量的孪生。当应变约为0.81%时,合金开始出现新的Σ3孪晶界。晶向á001?附近的拉伸轴向á001?方向转动,形成弱的á001?//RD丝织构,符合Toylor模型,晶粒拉伸轴向á001?-á111?连线转动,符合Sachs模型。晶粒尺寸显著影响晶粒的转动速率,小尺寸晶粒转动最快,大尺寸晶粒次之,中等尺寸晶粒转动最慢。晶粒Schmid因子越大,晶粒的转动越快。

 

关键字: 高熵合金;背散射电子衍射;微观组织;准静态拉伸;晶粒转动

Microstructure evolution of CoCrFeMnNi high-entropy alloy during quasi-static tensile
CAI Xiao-yong1, TANG Qun-hua2, DAI Pin-qiang1, 3, 4

1. College of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China; 2.School of Mechanical and Electrical Engineering, Putian University, Putian 351100, China; 3. College of Materials Science and Engineering, Fujian University of Technology, Fuzhou 350118, China; 4. Fujian Provincial Key Laboratory of Advanced Materials Processing and Application, Fujian University of Technology, Fuzhou 350118, China

Abstract:The evolution of microstructure of CoCrFeMnNi high-entropy alloy during quasi-static tensile (strain rate 1×10-1 s-1) were investigated using electron backscatter diffraction technology. The results show that the dominant deformation mechanism is dislocation gliding, which is accompanied with less twinning. The alloy generates new Σ3 twin boundaries when the strains is 0.81%. The tensile axes close to á001? rotate toward á001? and form a weak á001?//RD fiber texture following Toylor model. The tensile axes rotate to the line of á001?-á111? following Sachs model, the grain size influences the rotational speed of grains. The rotational speed of small grain is the fastest than big grains and medium grains, and the medium grain is the slowest than other grains. The bigger Schmid factor of grain is, the faster grain rotation is.

 

Key words: high-entropy alloy; electron backscatter diffraction technology; microstructure; quasi-static tensile; grain rotation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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