Deformation stimulated precipitation of a single-phase CoCrFeMnNi high entropy alloy

Zhou, Weimin; Fu, Li; Chen, Mingwei; Xu, Xiandong; Chen, B.; Zhu, Guo‐zhen; Wang, Xiaodong; Shan, Ai Dang

doi:10.1016/j.intermet.2017.02.010

Cited by 87 publications

(23 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The diffraction peaks of the Zr 2 Ni 7 , the B2 phase, and the σ phase can be found in the Zr 0.2 , Zr 0.5 , Zr 0.8 , and Zr 1.0 alloys. The σ phase was widely reported in previous research [ 30 , 31 ] and it can be identified as the NiCoCr (PDF 021-1271) σ phase, which has a tetragonal structure (a = 8.85 Å and c = 4.59 Å) in the present experiment. The B2 phase has been often found in HEAs containing CoCrFeNi [ 4 , 21 , 32 ].…”

Section: Resultssupporting

confidence: 68%

Effect of Zr Addition on the Microstructure and Mechanical Properties of CoCrFeNiMn High-Entropy Alloy Synthesized by Spark Plasma Sintering

Zhang

Liu

et al. 2018

Entropy

View full text Add to dashboard Cite

As a classic high-entropy alloy system, CoCrFeNiMn is widely investigated. In the present work, we used ZrH2 powders and atomized CoCrFeNiMn powders as raw materials to prepare CoCrFeNiMnZrx (x = 0, 0.2, 0.5, 0.8, 1.0) alloys by mechanical alloying (MA), followed by spark plasma sintering (SPS). During the MA process, a small amount of Zr (x ≤ 0.5) can be completely dissolved into CoCrFeNiMn matrix, when the Zr content is above 0.5, the ZrH2 is excessive. After SPS, CoCrFeNiMn alloy is still as single face-centered cubic (FCC) solid solution, and CoCrFeNiMnZrx (x ≥ 0.2) alloys have two distinct microstructural domains, one is a single FCC phase without Zr, the other is a Zr-rich microstructure composed of FCC phase, B2 phase, Zr2Ni7, and σ phase. The multi-phase microstructures can be attributed to the large lattice strain and negative enthalpy of mixing, caused by the addition of Zr. It is worth noting that two types of nanoprecipitates (body-centered cubic (BCC) phase and Zr2Ni7) are precipitated in the Zr-rich region. These can significantly increase the yield strength of the alloys.

show abstract

Section: Resultssupporting

confidence: 68%

Effect of Zr Addition on the Microstructure and Mechanical Properties of CoCrFeNiMn High-Entropy Alloy Synthesized by Spark Plasma Sintering

Zhang

Liu

et al. 2018

Entropy

View full text Add to dashboard Cite

show abstract

“…The ingots were remelted at least six times and subsequently homogenized at 1200 • C for 24 h. The solidus temperatures of the CoCrFeMnNi and CoCrFeNi HEAs are 1334 • C and 1444 • C, respectively [46]. 1200 • C is the temperature just below the lower solidus temperature, and it was selected in many other studies [24][25][26]. The CoCrFeMnNi and CoCrFeNi ingots were cold-rolled into plates of 3.5 mm thickness.…”

Section: Methodsmentioning

confidence: 99%

“…It is difficult to cast and easily becomes oxidized. Additionally, the CoCrFeMnNi HEA was reported to form brittle Cr-rich, FeCo and MnNi intermetallics when heat treated below 700 • C [25][26][27][28][29][30]. In contrast, the CoCrFeNi alloy was also reported to have a FCC structure and good mechanical properties, just like the CoCrFeMnNi HEA, except for a higher cost [24,[31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Dissimilar Infrared Brazing of CoCrFe(Mn)Ni Equiatomic High Entropy Alloys and 316 Stainless Steel

Lin

Shiue

et al. 2019

Crystals

View full text Add to dashboard Cite

Dissimilar infrared brazing of CoCrFeMnNi/CoCrFeNi equiatomic high entropy alloys and 316 stainless steel using MBF601 and BNi-2 foils was evaluated. The wetting angles of the two fillers at 50 °C above their liquidus temperatures on the three substrates were below 40 degrees. The CoCrFeMnNi/316 SS joint had the highest shear strength of 361 MPa with BNi-2 filler brazing at 1020 °C for 180 s, and fractured at the CrB compound in the joint. The CoCrFeMnNi/MBF601/316 SS joint contained a CoCrFeMnNi-based matrix, phosphides and B-containing compounds. The CoCrFeNi/316 SS joint had the highest shear strength of 374 MPa when brazed with BNi-2 filler at 1020 °C for 600 s, and fractured at the CrB in the joint. The CoCrFeNi/MBF601/316 SS joint consisted of a (Fe,Ni)-rich matrix, phosphides and B/Cr/Fe/P compounds, and the highest shear strength of 324 MPa was achieved when it was brazed at 1080 °C for 600 s.

show abstract

“…[30,31,132,175,197,198] Schuh et al [30] were the first one to report the formation of the secondary phases at intermediate temperatures. They investigated the thermal stability of the NC CrMnFeCoNi HEA produced by severe plastic deformation.…”

Section: Precipitation At Intermediate Temperaturesmentioning

confidence: 99%

“…[31,132,175,199] The difference in kinetics of phase decomposition between coarse grain and NC HEA is attributed to the enhanced diffusion of the NC material because of a lot of grain boundaries. Zhou et al [197] systematically investigated the precipitation behavior of cold rolled CrMnFeCoNi HEA during annealing at the intermediate temperatures. They observed the precipitation occurred during annealing of cold rolled alloy, but not in non-deformed alloy for the comparable annealing conditions.…”

Section: Precipitation At Intermediate Temperaturesmentioning

confidence: 99%

High‐Entropy Alloys: Potential Candidates for High‐Temperature Applications – An Overview

2017

View full text Add to dashboard Cite

Multi-principal elemental alloys, commonly referred to as high-entropy alloys (HEAs), are a new class of emerging advanced materials with novel alloy design concept. Unlike the design of conventional alloys, which is based on one or at most two principal elements, the design of HEA is based on multi-principal elements in equal or near-equal atomic ratio. The advent of HEA has revived the alloy design perception and paved the way to produce an ample number of compositions with different combinations of promising properties for a variety of structural applications. Among the properties possessed by HEAs, sluggish diffusion and strength retention at elevated temperature have caught wide attention. The need to develop new materials for high-temperature applications with superior high-temperature properties over superalloys has been one of the prime concerns of the high-temperature materials research community. The current article shows that HEAs have the potential to replace Ni-base superalloys as the next generation hightemperature materials. This review focuses on the phase stability, microstructural stability, and high-temperature mechanical properties of HEAs. This article will be highly beneficial for materials science and engineering community whose interest is in the development and understanding of HEAs for high-temperature applications.

show abstract

Deformation stimulated precipitation of a single-phase CoCrFeMnNi high entropy alloy

Cited by 87 publications

References 24 publications

Effect of Zr Addition on the Microstructure and Mechanical Properties of CoCrFeNiMn High-Entropy Alloy Synthesized by Spark Plasma Sintering

Effect of Zr Addition on the Microstructure and Mechanical Properties of CoCrFeNiMn High-Entropy Alloy Synthesized by Spark Plasma Sintering

Dissimilar Infrared Brazing of CoCrFe(Mn)Ni Equiatomic High Entropy Alloys and 316 Stainless Steel

High‐Entropy Alloys: Potential Candidates for High‐Temperature Applications – An Overview

Contact Info

Product

Resources

About