摘要
以单质元素粉末为原料,采用机械合金化和射频等离子体球化制备WMoTaNbV难熔高熵合金球形粉末。重点研究了球磨时间和射频等离子体球化过程对粉末物相、形貌、粒度和杂质含量的影响规律,并使用XRD、SEM、TEM、碳硫仪、氧氮氢仪和激光粒度分析仪等对粉末性能进行分析表征。结果表明:随着球磨时间的延长,低熔点元素逐渐向高熔点元素固溶。当球磨时间为14 h时,可以形成单一bcc相结构的难熔高熵合金粉末,粒径随球磨时间的延长逐渐细化,杂质含量随着球磨时间延长而增加。选取球磨2 h的粉末进行射频等离子球化,球化后的粉末中位粒径(D_(50))为55.9μm,氧碳含量(质量分数)分别是0.054%和0.021%,粉末流动性显著提高至8.4 s·(50 g)^(-1),振实密度达到8.80 g·cm^(-3)。
WMoTaNbV refractory high-entropy alloy spherical powder was prepared by mechanical alloying and radio frequency plasma spheroidization using elemental powder as raw material.The influences of ball milling time and radio frequency plasma spheroidization process on powder phase,morphology,particle size and impurity content were studied.Properties of powder were analyzed and characterized by XRD,SEM,TEM,carbon sulfur meter,oxygen,nitrogen and hydrogen meter,laser particle size analyzer,etc.The results show that as the ball milling time increases,the low melting point elements gradually become solid solution to the high melting point elements.When the ball milling time is 14 h,refractory high-entropy alloy powder with a single bcc phase structure can be formed.The particle size gradually becomes refined with the prolongation of the ball milling time,and the impurity content increases with the prolongation of the ball milling time.Powder milled for 2 h is subjected to radio frequency plasma spheroidization.The median particle size of the spheroidized powder(D_(50))is 55.9μm,and the oxygen and carbon contents are 0.054wt%and 0.021wt%,respectively.The powder flowability is significantly improved to 8.4 s(50 g)^(-1),and the tap density reaches 8.80 g·cm^(-3).
作者
王繁强
施麒
刘辛
刘斌斌
谭冲
谢焕文
申正焱
曾美琴
Wang Fanqiang;Shi Qi;Liu Xin;Liu Binbin;Tan Chong;Xie Huanwen;Shen Zhengyan;Zeng Meiqin(Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials,South China University of Technology,Guangzhou 510640,China;Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application,National Engineering Research Center ofPowder Metallurgy of Titanium&Rare Metals,Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510650,China;State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2024年第12期3428-3436,共9页
Rare Metal Materials and Engineering
基金
新金属材料国家重点实验室开放基金(2022-Z16)
广东省国际科技合作项目(2022A0505050025,2023A0505050122)
广东省科学院打造综合产业技术创新中心行动资金项目(2020GDASYL-20200504001,2022GDASZH-2022010107,2022GDASZH-2022010109)。
关键词
机械合金化
射频等离子球化
难熔高熵合金
球形粉末
mechanical alloying
radio frequency plasma spheroidization
refractory high-entropy alloy
spherical powder
