利用等离子熔覆技术在低碳钢表面制备了不同C含量的Al_(1.5)CoCrFeNiNb_(0.2)C_(x)(x=0,0.01,0.02,0.05,0.2)高熵合金熔覆层,采用X射线衍射仪(X-ray diffraction,XRD)、扫描电镜(scanning electron microscope,SEM)、透射电镜(transmiss...利用等离子熔覆技术在低碳钢表面制备了不同C含量的Al_(1.5)CoCrFeNiNb_(0.2)C_(x)(x=0,0.01,0.02,0.05,0.2)高熵合金熔覆层,采用X射线衍射仪(X-ray diffraction,XRD)、扫描电镜(scanning electron microscope,SEM)、透射电镜(transmission electron microscopy,TEM)、硬度仪以及磨损试验机等手段,研究C含量对熔覆层微观组织以及力学性能的影响规律.结果表明,x=0,0.01时,Al_(1.5)CoCrFeNiNb_(0.2)C_(x)高熵合金的物相由BCC相以及少量富Nb的Laves相组成;x=0.02~0.2时,能够原位合成NbC,且随着C含量的升高,NbC的析出量逐渐增加.x=0,0.01时,高熵合金的微观组织为树枝晶结构,枝晶为BCC相,枝晶间为BCC相+富Nb的Laves相组成的共晶组织.x=0.02~0.2时,树枝晶基体上析出原位合成NbC,并且随着C含量的升高,NbC的析出量和尺寸逐渐增大,其形貌由低含量下(x=0.02,0.05)的颗粒状逐渐转变为高含量下(x=0.2)的颗粒状以及十字状.TEM表明,高熵合金基体与NbC增强相之间的界面光滑纯净,没有任何缺陷以及其他污染物.随着C含量由x=0增加至x=0.2,熔覆层硬度由560.1 HV增加至762.2 HV,磨损率由24.69 mg/min降低至4.70 mg/min.展开更多
文摘利用等离子熔覆技术在低碳钢表面制备了不同C含量的Al_(1.5)CoCrFeNiNb_(0.2)C_(x)(x=0,0.01,0.02,0.05,0.2)高熵合金熔覆层,采用X射线衍射仪(X-ray diffraction,XRD)、扫描电镜(scanning electron microscope,SEM)、透射电镜(transmission electron microscopy,TEM)、硬度仪以及磨损试验机等手段,研究C含量对熔覆层微观组织以及力学性能的影响规律.结果表明,x=0,0.01时,Al_(1.5)CoCrFeNiNb_(0.2)C_(x)高熵合金的物相由BCC相以及少量富Nb的Laves相组成;x=0.02~0.2时,能够原位合成NbC,且随着C含量的升高,NbC的析出量逐渐增加.x=0,0.01时,高熵合金的微观组织为树枝晶结构,枝晶为BCC相,枝晶间为BCC相+富Nb的Laves相组成的共晶组织.x=0.02~0.2时,树枝晶基体上析出原位合成NbC,并且随着C含量的升高,NbC的析出量和尺寸逐渐增大,其形貌由低含量下(x=0.02,0.05)的颗粒状逐渐转变为高含量下(x=0.2)的颗粒状以及十字状.TEM表明,高熵合金基体与NbC增强相之间的界面光滑纯净,没有任何缺陷以及其他污染物.随着C含量由x=0增加至x=0.2,熔覆层硬度由560.1 HV增加至762.2 HV,磨损率由24.69 mg/min降低至4.70 mg/min.
