摘要
在CoCrNi三元、CoCrFeNi四元和Al_(0.3)CoCrFeNi五元合金中分别添加0.1~0.5(摩尔比)Ti,通过真空电弧炉制备出高硬度和高压缩强度的中/高熵CoCrNiTi_(x)、CoCrFeNiTi_(x)和Al_(0.3)CoCrFeNiTi_(x)合金棒材。Ti添加量为0.1的合金棒材(以下简称Ti_(0.1)合金,其余合金作相同处理)均保持单相FCC结构;Ti_(0.3)合金均出现少量的新相(η或R);CoCrNiTi_(0.5)合金由FCC+BCC+η+σ相组成,Al_(0.3)CoCrFeNiTi_(0.5)合金由FCC+BCC+R+B_(2)相组成,且二者微观组织均呈“花朵”状;而CoCrFeNiTi_(0.5)合金则由FCC+Laves+R+σ相组成,为树枝晶状结构。随着Ti含量的增加,三种体系合金的硬度均逐渐提高,且提高幅度按CoCrNiTi_(x)、Al_(0.3)CoCrFeNiTi_(x)、CoCrFeNiTi_(x)顺序降低,其中CoCrNiTi_(x)合金的硬度从CoCrNi合金的164HV提升至CoCrNiTi_(0.5)合金的865HV,提高幅度达427%。Ti_(0)和Ti_(0.1)合金均表现出优异的压缩塑性(不断裂),Ti_(0.3)和Ti_(0.5)合金的压缩屈服强度均显著提高,其中Al_(0.3)CoCrFeNiTi_(x)合金的压缩屈服强度从Al_(0.3)CoCrFeNiTi_(0.3)合金的630 MPa提高至Al_(0.3)CoCrFeNiTi_(0.5)合金的1642 MPa,提高幅度达160%;但抗压强度和压缩变形量有所降低。
Ti_(0.1)~Ti_(0.5) were added into ternary CoCrNi,quaternary CoCrFeNi and quinary Al_(0.3)CoCrFeNi alloys,respectively,and then medium/high entropy alloy rods with high hardness and compressive strength were prepared by vacuum arc furnace.Ti_(0.1) alloys still maintain a single-phase FCC structure.Ti_(0.3) alloys have a small amount of new phases (η or R).For Ti_(0.5),CoCrNiTi_(0.5) alloy is composed of FCC+BCC+η+σ.Al_(0.3)CoCrFeNiTi_(0.5) alloy is composed of FCC+BCC+R+B_(2) phase,and both the microstructures are flower-like.While CoCrFeNiTi_(0.5) alloy is composed of FCC+Laves+R+σ,and is the dendritic structure.With increasing the Ti content,the hardness of the three series alloys increases gradually,and the increase amplitude decreases in the following order:CoCrNiTi_(x)Al_(0.3)CoCrFeNiTi_(x)CoCrFeNiTi_(x),wherein,the hardness of CoCrNiTi_(x) alloy increases from 164HV for CoCrNi alloy to 865HV for CoCrNiTi_(0.5) alloy,with increase by 427%.Both Ti_(0) and Ti_(0.1) alloys show excellent compressive plasticity (without fracture),and the compressive yield strengths of Ti_(0.3) and Ti_(0.5) alloys are significantly enhanced,which of Al_(0.3)CoCrFeNiTi_(x) alloy increases from 630 MPa for Al_(0.3)CoCrFeNiTi_(0.3) alloy to 1642 MPa for Al_(0.3)CoCrFeNiTi_(0.5) alloy,with increase by 160%.However,the compressive strength and amount of compression deformation decrease slightly.
作者
温盛华
赵志豪
黄正华
陶平均
陈峰
闫志巧
WEN Sheng-hua;ZHAO Zhi-hao;HUANG Zheng-hua;TAO Ping-jun;CHEN Feng;YAN Zhi-qiao(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China;Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application,Guangdong–Hong Kong Joint Research and Development Center on Advanced Manufacturing Technology for Light Alloys,Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510650,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2023年第5期1480-1492,共13页
The Chinese Journal of Nonferrous Metals
基金
广东省基础与应用基础研究基金资助项目(2021B1515120071)。
关键词
高熵合金
单相FCC结构
Ti合金化
微观组织
力学性能
high entropy alloy
single-phase FCC structure
alloying of Ti
microstructure
mechanical property
