退火对AlCuFeNiTiCr_(x)高熵合金硬度的影响  

Effect of annealing on microstructure and hardness of AlCuFeNiTiCr_(x) high entropy alloys

作　　者：张晓蓉 尚华龙 Zhang Xiaorong;Shang Hualong(College of Transportation,Shandong University of Engineering and Vocational Technology,Jinan Shandong 250200,China)

机构地区：[1]山东工程职业技术大学交通学院,山东济南250200

出　　处：《金属热处理》2023年第2期170-173,共4页Heat Treatment of Metals

基　　金：山东工程职业技术大学校内科研基金。

摘　　要：采用铜模吸铸法制备AlCuFeNiTiCr_(x)(x=0.5, 1.0, 1.5, 2.0)高熵合金,并在1000℃下进行3 h退火处理。通过X射线衍射仪(XRD)、光学显微镜、维氏硬度计,分别测试了铸态和退火态AlCuFeNiTiCr_(x)(x=0.5, 1.0, 1.5, 2.0)高熵合金的微观结构演变及维氏硬度值。发现铸态和退火态试样仅由简单的体心立方(BCC)和面心立方(FCC)固溶体相组成,而退火态试样中的FCC相与铸态试样中的FCC相相比有所增加。根据金相显微照片,两种状态下的高熵合金仅存在枝晶和晶间相,且退火后的显微组织变得更加均匀。两种状态下高熵合金的硬度均随Cr含量的增加而增加,且退火态试样的硬度值远大于铸态试样。AlCuFeNiTiCr_(x)(x=0.5, 1.0, 1.5, 2.0) high entropy alloys were prepared by copper mold suction casting method, then the specimens were annealed at 1000 ℃ for 3 h. Microstructure evolution and hardness of as-cast and as-annealed AlCuFeNiTiCr_(x)(x=0.5, 1.0, 1.5, 2.0) alloys were tested by X-ray diffraction(XRD), optical microscope, Vickers hardness tester, respectively. It is found that both of the as-cast and the as-annealed specimens consist only simple body-centered cubic(BCC) and face-centered cubic(FCC) solid solution phases, while the FCC phase in the as-annealed specimens increases compared with that in the as-cast specimens. There are only dendrite and interdendrite phases for both the as-cast and the as-annealed alloys, though the microstructure becomes more homogeneous after annealing according to the metallographical micrographs. The hardness increases with the increase of Cr content, and the as-annealed hardness values are much higher than the as-cast ones because the increase of FCC phase in the as-annealed specimens.

关 键 词：高熵合金 退火 微观结构 硬度 

分 类 号：TG166.7[金属学及工艺—热处理] TB303[金属学及工艺—金属学]