韩杰胜,吴有智,孟军虎,张爱军,苏博.放电等离子烧结MoNbTaW难熔高熵合金[J].稀有金属材料与工程,2019,48(6):2020~2026.[Han Jiesheng,Wu Youzhi,Meng Junhu,Zhang Aiju,Su Bo.Preparation of MoNbTaW Refractory High-Entropy Alloys by Spark Plasma Sintering[J].Rare Metal Materials and Engineering,2019,48(6):2020~2026.]
放电等离子烧结MoNbTaW难熔高熵合金
投稿时间:2017-12-16  修订日期:2018-01-15
中文关键词:  难熔高熵合金  放电等离子烧结  力学性能  解理断裂
基金项目:
中文摘要:
      以纯金属元素粉末为原料,采用放电等离子烧结工艺制备了MoNbTaW难熔高熵合金,研究了烧结温度和保温时间等工艺参数对MoNbTaW难熔高熵合金的物相、晶体结构、烧结行为和力学性能的影响。结果表明,在烧结温度1800℃和保温5min即可形成BCC单相高熵合金;烧结温度是影响MoNbTaW难熔高熵合金致密度、晶粒尺寸和力学性能的主要因素;随着烧结温度的升高,合金的晶粒尺寸增大,致密度、硬度和和屈服强度均增高;烧结温度为2000℃时合金的致密度可达99.8%,化学成分无偏析,屈服强度为1314±14MPa,断裂韧性为(5~6)MPa.m1/2,其断裂模式为解理断裂。
Preparation of MoNbTaW Refractory High-Entropy Alloys by Spark Plasma Sintering
英文关键词:refractory high-entropy alloys  spark plasma sintering  mechanical property  cleavage fracture
英文摘要:
      The MoNbTaW refractory high-entropy alloys were prepared by spark plasma sintering using pure metal powders as raw materials. The effects of technological parameters on the phase, crystal structure, sintering behavior and mechanical properties of MoNbTaW refractory high-entropy alloys were studied. The results show that the single-phase BCC high-entropy alloy can be formed at the sintering temperature of 1800 °C with the holding time of 5 min. The sintering temperature is the most important factor that affects the density, grain size and mechanical properties of the MoNbTaW refractory high-entropy alloy. When the sintering temperature is 2000 °C, the density of the alloy is 99.8 %, and the yield strength is 1314±14 MPa, the fracture toughness is (5~6)MPa.m1/2. The MoNbTaW refractory high-entropy alloy prepared by spark plasma sintering process have no chemical composition segregation and is a brittle material with the fracture mode of cleavage fracture.
作者单位E-mail
韩杰胜 兰州理工大学 材料科学与工程学院 jshan@licp.cas.cn 
吴有智 兰州理工大学 材料科学与工程学院 youzhiwu@163.com 
孟军虎 中国科学院兰州化学物理研究所 固体润滑国家重点实验室  
张爱军 中国科学院兰州化学物理研究所 固体润滑国家重点实验室  
苏博 中国科学院兰州化学物理研究所 固体润滑国家重点实验室  
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