scholarly journals A Review of the Serrated-Flow Phenomenon and Its Role in the Deformation Behavior of High-Entropy Alloys

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1101 ◽  
Author(s):  
Jamieson Brechtl ◽  
Shuying Chen ◽  
Chanho Lee ◽  
Yunzhu Shi ◽  
Rui Feng ◽  
...  
Keyword(s):  
Strain Rate ◽  
Complexity Analysis ◽  
Flow Behavior ◽  
Dynamical Behavior ◽  
Future Research ◽  
High Entropy Alloys ◽  
Material System ◽  
Experimental Conditions ◽  
Serrated Flow ◽  
High Entropy

High-entropy alloys (HEAs) are a novel class of alloys that have many desirable properties. The serrated flow that occurs in high-entropy alloys during mechanical deformation is an important phenomenon since it can lead to significant changes in the microstructure of the alloy. In this article, we review the recent findings on the serration behavior in a variety of high-entropy alloys. Relationships among the serrated flow behavior, composition, microstructure, and testing condition are explored. Importantly, the mechanical-testing type (compression/tension), testing temperature, applied strain rate, and serration type for certain high-entropy alloys are summarized. The literature reveals that the serrated flow can be affected by experimental conditions such as the strain rate and test temperature. Furthermore, this type of phenomenon has been successfully modeled and analyzed, using several different types of analytical methods, including the mean-field theory formalism and the complexity-analysis technique. Importantly, the results of the analyses show that the serrated flow in HEAs consists of complex dynamical behavior. It is anticipated that this review will provide some useful and clarifying information regarding the serrated-flow mechanisms in this material system. Finally, suggestions for future research directions in this field are proposed, such as the effects of irradiation, additives (such as C and Al), the presence of nanoparticles, and twinning on the serrated flow behavior in HEAs.

scholarly journals High-Temperature Deformation Behaviors of the C-Doped and N-Doped High Entropy Alloys

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1517
Author(s):  
Hailong Yi ◽  
Yifan Zhang ◽  
Renyi Xie ◽  
Mengyuan Bi ◽  
Daixiu Wei
Keyword(s):  
High Temperature ◽  
Strain Rate ◽  
Flow Behavior ◽  
Temperature Deformation ◽  
Cubic Phase ◽  
High Entropy Alloys ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Recrystallization Mechanism ◽  
Low Strain Rate

High entropy alloys (HEAs) containing multi-principal metallic constituents have attracted much attention. A good understanding of their hot-deformation behavior and recrystallization mechanism is the prerequisite for microstructures tuning and for optimizing mechanical performance. Here, the flow behavior and recrystallization mechanism of the N-doped and C-doped face-centered cubic phase HEAs are produced at high temperatures by hot-compression at 1123–1273 K, with strain rates of 0.1–0.001 s−1. Constitutive equations were successfully constructed to reveal flow behavior, and stress-strain curves were predicted using strain compensated polynomial functions. Discontinuous and continuous dynamic recrystallization proceeded concurrently when compressed at a low temperature and high strain rate, whereas discontinuous recrystallization, which occurs at primary grain boundaries, became predominant at a high temperature and low strain rate, significantly contributing to the refinement and homogenization of the grains. For this reason, a relatively high temperature and a low strain rate, in which the recrystallized grains exhibit equiaxed morphology and very weak texture, are more suitable for refining grains. The average size of the grains was approximately 10 μm. This study sheds light on grain optimization and mechanical properties through thermomechanical processing.

Micro-compression studies of face-centered cubic and body-centered cubic high-entropy alloys: Size-dependent strength, strain rate sensitivity, and activation volumes

2020 ◽  
Vol 790 ◽  
pp. 139429 ◽  
Author(s):  
Yuan Xiao ◽  
Roksolana Kozak ◽  
Michel J.R. Haché ◽  
Walter Steurer ◽  
Ralph Spolenak ◽  
...  
Keyword(s):  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Rate Sensitivity ◽  
High Entropy Alloys ◽  
Face Centered Cubic ◽  
Body Centered Cubic ◽  
High Entropy ◽  
Size Dependent ◽  
Face Centered

scholarly journals Effect of Strain Rate on the Tensile Behavior of CoCrFeNi and CoCrFeMnNi High-Entropy Alloys

2019 ◽  
Vol 28 (7) ◽  
pp. 4348-4356 ◽  
Author(s):  
Mitra Shabani ◽  
Joseph Indeck ◽  
Kavan Hazeli ◽  
Paul D. Jablonski ◽  
Garrett J. Pataky
Keyword(s):  
Strain Rate ◽  
Tensile Behavior ◽  
High Entropy Alloys ◽  
High Entropy

scholarly journals Self-Similar Random Process and Chaotic Behavior In Serrated Flow of High Entropy Alloys

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Shuying Chen ◽  
Liping Yu ◽  
Jingli Ren ◽  
Xie Xie ◽  
Xueping Li ◽  
...  
Keyword(s):  
Random Process ◽  
Chaotic Behavior ◽  
High Entropy Alloys ◽  
Serrated Flow ◽  
High Entropy ◽  
Self Similar

scholarly journals Reflections on the Spatial Performance of Atom Probe Tomography in the Analysis of Atomic Neighborhoods

2021 ◽  
pp. 1-11
Author(s):  
Baptiste Gault ◽  
Benjamin Klaes ◽  
Felipe F. Morgado ◽  
Christoph Freysoldt ◽  
Yue Li ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Atomic Scale ◽  
High Entropy Alloys ◽  
Material System ◽  
Field Evaporation ◽  
Ion Imaging ◽  
High Entropy ◽  
Spatial Performance ◽  
Pure Metals

Atom probe tomography (APT) is often introduced as providing “atomic-scale” mapping of the composition of materials and as such is often exploited to analyze atomic neighborhoods within a material. Yet quantifying the actual spatial performance of the technique in a general case remains challenging, as it depends on the material system being investigated as well as on the specimen's geometry. Here, by using comparisons with field-ion microscopy experiments, field-ion imaging and field evaporation simulations, we provide the basis for a critical reflection on the spatial performance of APT in the analysis of pure metals, low alloyed systems and concentrated solid solutions (i.e., akin to high-entropy alloys). The spatial resolution imposes strong limitations on the possible interpretation of measured atomic neighborhoods, and directional neighborhood analyses restricted to the depth are expected to be more robust. We hope this work gets the community to reflect on its practices, in the same way, it got us to reflect on our work.

Serrated Flow in an 11Cr Ferritic/Martensitic Steel

2014 ◽  
Vol 894 ◽  
pp. 125-128 ◽  
Author(s):  
Zhi Qiang Xu ◽  
Yin Zhong Shen ◽  
Bo Ji ◽  
Sheng Zhi Li ◽  
Ai Dang Shan
Keyword(s):  
Tensile Stress ◽  
Strain Rate ◽  
Yield Stress ◽  
Room Temperature ◽  
Martensitic Steel ◽  
Flow Behavior ◽  
Tensile Tests ◽  
Ultimate Tensile Stress ◽  
Strain Rates ◽  
Serrated Flow

Serrated flow behavior of an 11Cr ferritic/martensitic steel was investigated through tensile tests at initial strain rates of 2×10-510-3 s-1 at temperatures ranging from room temperature to 973 K. Serrated flow occurred at three temperature regions of room temperature, 573 K and 773973 K when tensile tests were conducted at a strain rate of 2×10-4 s-1. Serrations are also observed in the steel during tension at temperatures of 573 K and 773973 K at a strain rate of 2×10-5 s-1. With increasing tensile temperature, the yield stress and ultimate tensile stress of the steel were gradually decreased and quickly dropped at temperatures higher than 773 K, while the elongation of the steel was decreased to a minimum at 600 K, and then dramatically increased at temperatures higher than 600 K.

Temperature dependent deformation mechanisms of Al0.3CoCrFeNi high-entropy alloy, starting from serrated flow behavior

2018 ◽  
Vol 757 ◽  
pp. 39-43 ◽  
Author(s):  
Yu Zhang ◽  
Jinshan Li ◽  
Jun Wang ◽  
William Yi Wang ◽  
Hongchao Kou ◽  
...  
Keyword(s):  
Flow Behavior ◽  
Deformation Mechanisms ◽  
High Entropy Alloy ◽  
Temperature Dependent ◽  
Serrated Flow ◽  
High Entropy

Ultra-high strain-rate strengthening in ductile refractory high entropy alloys upon dynamic loading

2020 ◽  
Vol 121 ◽  
pp. 106699 ◽  
Author(s):  
S. Zhang ◽  
Z. Wang ◽  
H.J. Yang ◽  
J.W. Qiao ◽  
Z.H. Wang ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Dynamic Loading ◽  
High Strain ◽  
High Entropy Alloys ◽  
High Entropy

Effects of temperature and strain rate on plastic deformation mechanisms of nanocrystalline high-entropy alloys

2020 ◽  
Vol 120 ◽  
pp. 106741 ◽  
Author(s):  
Li Li ◽  
Haotian Chen ◽  
Qihong Fang ◽  
Jia Li ◽  
Feng Liu ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Strain Rate ◽  
Deformation Mechanisms ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Effects Of Temperature
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