The Origins of High-Entropy Alloy Contamination Induced by Mechanical Alloying and Sintering

被引:42
作者
Moravcik, Igor [1 ]
Kubicek, Antonin [1 ]
Moravcikova-Gouvea, Larissa [1 ]
Adam, Ondrej [1 ]
Kana, Vaclav [2 ]
Pouchly, Vaclav [3 ]
Zadera, Antonin [2 ]
Dlouhy, Ivo [1 ]
机构
[1] Brno Univ Technol, Inst Mat Sci & Engn, Tech 2896-2, Brno 61669, Czech Republic
[2] Brno Univ Technol, Inst Mfg Technol, Tech 2896-2, Brno 61669, Czech Republic
[3] Brno Univ Technol, CEITEC BUT, Purkynova 123, Brno 61200, Czech Republic
关键词
contamination; mechanical alloying; spark plasma sintering; infrared detection; high-entropy alloy; austenitic stainless steel; IRON CONTAMINATION; MICROSTRUCTURE; POWDER; MATRIX; COMPOSITES; ELEMENTS; DESIGN; CARBON; FE;
D O I
10.3390/met10091186
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
One of the prevailing problems for materials produced by powder metallurgy is contamination from various sources. This work deals with the influence of process parameters and presence of process control agents (PCA) on the contamination level of materials produced by means of mechanical alloying (MA) technology, densified with spark plasma sintering (SPS). The equiatomic CoCrFeNi high-entropy alloy (HEA) was manufactured by the said methodology. For clear comparison, the 316L austenitic steel powder was milled and densified with identical conditions as a reference material. Both materials were milled in argon and nitrogen atmospheres for various times from 5 to 30 h. Chemical analysis of contamination by carbon, oxygen, and nitrogen within the powder and bulk materials was carried out using combustion analyzers. The microstructural analysis of powders and bulk samples was carried out using scanning electron microscopy (SEM) with focus on contaminant phases. The results show that carbon contamination increases with milling time. It is caused by wear of milling vial and balls made from high-carbon steels. Increase of carbon content within consolidation using SPS was also observed. The oxygen contamination also increases with milling time. It is more pronounced in the CoCrFeNi alloy due to higher oxidation of powder surfaces prior to milling. Milling of powders using nitrogen atmosphere also causes an increase of nitrogen content in both HEA and AISI 316L. The use of PCA (ethanol) during milling even for a short time (30 min) causes significant increase of carbon and oxygen contamination. The ways to decrease contamination are discussed in the paper.
引用
收藏
页码:1 / 15
页数:15
相关论文
共 33 条
[1]  
Abbaschian R., 2008, Physical Metallurgy Principles, V4th
[2]   Microstructural development in equiatomic multicomponent alloys [J].
Cantor, B ;
Chang, ITH ;
Knight, P ;
Vincent, AJB .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2004, 375 :213-218
[3]   Processing and Properties of High-Entropy Ultra-High Temperature Carbides [J].
Castle, Elinor ;
Csanadi, Tamas ;
Grasso, Salvatore ;
Dusza, Jan ;
Reece, Michael .
SCIENTIFIC REPORTS, 2018, 8
[4]  
Deffley R., 2017, VACUUM VS NONVACUUM
[5]   On iron contamination in mechanically alloyed Cr-Si powders [J].
Fernandes, BB ;
Rodrigues, G ;
Coelho, GC ;
Ramos, AS .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2005, 405 (1-2) :135-139
[6]   Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures [J].
Gludovatz, Bernd ;
Hohenwarter, Anton ;
Thurston, Keli V. S. ;
Bei, Hongbin ;
Wu, Zhenggang ;
George, Easo P. ;
Ritchie, Robert O. .
NATURE COMMUNICATIONS, 2016, 7
[7]   A fracture-resistant high-entropy alloy for cryogenic applications [J].
Gludovatz, Bernd ;
Hohenwarter, Anton ;
Catoor, Dhiraj ;
Chang, Edwin H. ;
George, Easo P. ;
Ritchie, Robert O. .
SCIENCE, 2014, 345 (6201) :1153-1158
[8]   Characterization of Powder Metallurgy High-Entropy Alloys Prepared by Spark Plasma Sintering [J].
Gouvea, Larissa ;
Moravcik, Igor ;
Cizek, Jan ;
Krajnakova, Petra ;
Jan, Vit ;
Dlouhy, Ivo .
THERMEC 2018: 10TH INTERNATIONAL CONFERENCE ON PROCESSING AND MANUFACTURING OF ADVANCED MATERIALS, 2018, 941 :1053-1058
[9]   Effects of carbon on the microstructures and mechanical properties of FeCoCrNiMn high entropy alloys [J].
Guo, Lin ;
Ou, Xiaoqin ;
Ni, Song ;
Liu, Yong ;
Song, Min .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2019, 746 :356-362
[10]   Surface chemical state of Ti powders and its alloys: Effect of storage conditions and alloy composition [J].
Hryha, Eduard ;
Shyab, Ruslan ;
Bram, Martin ;
Bitzer, Martin ;
Nyborg, Lars .
APPLIED SURFACE SCIENCE, 2016, 388 :294-303