Journal Article10.1016/J.MSEA.2015.09.034
Effects of AL addition on microstructure and mechanical properties of AlxCoCrFeNi High-entropy alloy
Tengfei Yang,Songqin Xia,Shi Liu,Chenxu Wang,S. Q. Liu,Yong Zhang,Jianming Xue,Sha Yan,Yugang Wang +8 more
338
TL;DR: In this article, the effects of Al on microstructure and mechanical properties of AlxCoCrFeNi (x=0.1, 0.75 and 1.5) high-entropy alloys were systematically studied by using various characterization methods.
read more
Abstract: The effects of Al on microstructure and mechanical properties of AlxCoCrFeNi (x=0.1, 0.75 and 1.5) high-entropy alloys were systematically studied by using various characterization methods. It was found that the crystalline structure of AlxCoCrFeNi high-entropy alloy varies markedly with Al content, which changes from the initial single face-centered cubic (fcc) to fcc plus ordered body-centered cubic (bcc) structure (B2) and then to a duplex bcc structure (A2+B2) as the Al content is increased. The chemical composition analysis reveals that Al primarily partitions to B2 phase, suggesting Al is a stabilizer of B2 structure. With increasing Al content, more Ni and Al partition to the B2 phase due to the very negative mixing enthalpy of Ni and Al, and another phase enriched in Cr and Fe transforms from fcc to disordered bcc. Nano indentation measurements show that the hardness of AlxCoCrFeNi high-entropy alloy increases with Al content, accompanied by the decrease of ductility. The stability of single-phase solid solution in AlxCoCrFeNi HEAs is deduced from various criteria. Combined with the experiment results of other similar HEA systems, such as AlxCoCrFeNiCu, the effects of Al addition on the microstructure of AlxCoCrFeNi HEAs are discussed based on the Gibbs free energy of all competing phases and the fundamental properties of constituent elements. The aim of current study is to provide experimental evidence to establish a correlation between the microstructure and mechanical properties to search for high-entropy alloys with higher performances.
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
Stress-induced transformation behavior in near-eutectic (AlNi2)70-Co30Cr medium entropy alloys
01 Jan 2022
TL;DR: In this paper , an evaluation of the microstructure and mechanical properties in as-cast non-equiatomic medium entropy alloys (MEAs) (AlNi2)70-xCo30Crx (with x = 2.5, 10, 17.5 and 25 at.
6
Studies on the design and properties of FeCrVTix medium-entropy alloys for potential nuclear applications
01 Feb 2022
TL;DR: In this article , the FeCrVTix medium-entropy alloys (MEAs) were designed for the working under extreme environments of the advanced nuclear energy systems based on the requirements of low activation, high-temperature thermal stability, high strength, high ductility, high thermal conductivity, irradiation resistance, corrosion resistance and other characteristics.
6
Improvement of thermal shock resistance and hot mechanical properties by FCC/BCC/B2 multiphase strengthened microstructure in laser cladded high-entropy alloy coatings
Y. Tao,Qunshuang Ma,Yuyun Lu,D. Huang,Hui Zhang +4 more
TL;DR: Laser-cladded high-entropy alloy coatings exhibit improved thermal shock resistance and hot mechanical properties due to a multiphase strengthened microstructure, comprising FCC, BCC, and B2 phases, which enhances hardness, crack damage resistance, and wear resistance at high temperatures.
6
Understanding the microstructure evolution characteristics and mechanical properties of an AlCoCrFeNi2.1 high entropy alloy fabricated by laser energy deposition
Weimin Guo,Yan Qiang Zhang,N. Ding,Long Liu,Huixia Xu,Nan Xu,Lu Tian,Guo-liang Liu,Dexiao Dong,Xiebin Wang +9 more
TL;DR: In this paper , an AlCoCrFeNi2.1 high entropy alloy is fabricated by laser energy deposition, which is held for 1 h and cooled in water to investigate the effect of heat-treating conditions on microstructure evolution and mechanical properties of the alloys.
6
References
An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments
Warren C. Oliver,George M. Pharr +1 more
TL;DR: In this paper, the authors used a Berkovich indenter to determine hardness and elastic modulus from indentation load-displacement data, and showed that the curve of the curve is not linear, even in the initial stages of the unloading process.
25.4K
Nanostructured High-Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes
Jien-Wei Yeh,Swe-Kai Chen,Su-Jien Lin,Jon-Yiew Gan,Tsung-Shune Chin,Tsung-Shune Chin,Tao-Tsung Shun,Chun-Huei Tsau,Shou-Yi Chang +8 more
TL;DR: A new approach for the design of alloys is presented in this paper, where high-entropy alloys with multi-principal elements were synthesized using well-developed processing technologies.
11.7K
A fracture-resistant high-entropy alloy for cryogenic applications
Bernd Gludovatz,Anton Hohenwarter,Dhiraj Catoor,Edwin H. Chang,Easo P. George,Easo P. George,Robert O. Ritchie,Robert O. Ritchie +7 more
TL;DR: This work examined a five-element high-entropy alloy, CrMnFeCoNi, which forms a single-phase face-centered cubic solid solution, and found it to have exceptional damage tolerance with tensile strengths above 1 GPa and fracture toughness values exceeding 200 MPa·m1/2.
The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy
F. Otto,F. Otto,Antonín Dlouhý,Christoph Somsen,Hongbin Bei,Gunther Eggeler,Easo P. George,Easo P. George +7 more
TL;DR: In this article, an equiatomic CoCrFeMnNi high-entropy alloy, which crystallizes in the face-centered cubic (fcc) crystal structure, was produced by arc melting and drop casting.
2.8K
Mechanical properties of Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20 refractory high entropy alloys
TL;DR: In this paper, two refractory high entropy alloys with compositions near Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20, were produced by vacuum arc-melting.
2.5K