微合金化对铁基无磁中熵合金组织、力学和磁学性能的影响  

Effect of Microalloying on Microstructure and Properties of Non-magnetic Medium Entropy Alloy

作　　者：赵燕春[1] 李泽锋 徐伟[1] 寇生中[1] ZHAO Yanchun;LI Zefeng;XU Wei;KOU Shengzhong(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属加工与再利用国家重点实验室,兰州730050

出　　处：《有色金属工程》2022年第2期1-7,共7页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(52061027,51661017);甘肃省杰出青年基金项目(17JR5RA108);兰州理工大学红柳优秀青年基金项目(2018)。

摘　　要：采用水冷铜坩埚磁悬浮熔炼和铜模负压吸铸法制备了(Fe_(63.3)Mn_(14)Si_(9.1)Cr_(9.8)C_(3.8))_(100-x)Y_(x)(Y=Ag,Cu)中熵合金,通过XRD、SEM及VSM等研究了Ag和Cu微合金化对合金层错能、组织、力学和磁学性能的影响。结果表明,Fe_(63.3)Mn_(14)Si_(9.1)Cr_(9.8)C_(3.8)中熵合金为fcc结构,抗磁性元素Ag和Cu的添加进一步降低层错能同时细化晶粒,使得合金的屈服强度降低而断裂强度和塑性增加。(Fe_(63.3)Mn_(14)Si_(9.1)Cr_(9.8)C_(3.8))_(99.6)Cu_(0.4)合金的断裂强度与塑性应变分别达到(2435±1)MPa和(22.2±0.1)%,相对磁导率低至1.00013,呈现出优异的力学性能和顺磁性。A medium entropy alloy(Fe_(63.3)Mn_(14)Si_(9.1)Cr_(9.8)C_(3.8))_(100-x)Y_(x)(Y=Ag,Cu)was fabricated via a water-cooled copper crucible magnetic levitation melting and copper mold negative pressure suction casting method.The effects of adding Ag and Cu elements micro-alloying on the stacking fault energy,microstructure,mechanical properties and magnetic properties of the alloy were studied by XRD,SEM and VSM.The results show that the alloy contains fcc phase and low stacking fault energy.The addition of diamagnetic elements Ag and Cu further reduces stacking fault and refines grain size,decreases the yield strength and improves the fracture strength and plasticity.The fracture strength and plasticity of(Fe_(63.3)Mn_(14)Si_(9.1)Cr_(9.8)C_(3.8))_(99.6)Cu_(0.4) alloy are up to(2435±1)MPa and(22.2±0.1)%,respectively,while the relative permeability is just 1.00013,thus indicating excellent mechanical properties and paramagnetism.

关 键 词：中熵合金 合金化 微观组织 力学性能 磁学性能 

分 类 号：TG139.8[一般工业技术—材料科学与工程] TG13.2[金属学及工艺—合金]