Abnormal γ″ - ε phase transformation in the CoCrFeNiNb0.25 high entropy alloy

2018 ◽  
Vol 146 ◽  
pp. 281-285 ◽  
Author(s):  
Feng He ◽  
Zhijun Wang ◽  
Jing Wang ◽  
Qingfeng Wu ◽  
Da Chen ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Ε Phase

scholarly journals Phase Transformation Kinetics of a FCC Al0.25CoCrFeNi High-Entropy Alloy during Isochronal Heating

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1015
Author(s):  
Jun Wang ◽  
Chen Wei ◽  
Haoxue Yang ◽  
Tong Guo ◽  
Tingting Xu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Activation Energy ◽  
Phase Transformation ◽  
High Entropy Alloy ◽  
Transformation Kinetics ◽  
High Entropy ◽  
Phase Transformation Kinetics ◽  
Diffusion Controlled ◽  
Thermal Dilation ◽  
Kinetics Of

The phase transformation kinetics of a face-centered-cubic (FCC) Al0.25CoCrFeNi high-entropy alloy during isochronal heating is investigated by thermal dilation experiment. The phase transformed volume fraction is determined from the thermal expansion curve, and results show that the phase transition is controlled by diffusion controlled nucleation-growth mechanism. The kinetic parameters, activation energy and kinetic exponent are determined based on Kissinger–Akahira–Sunose (KAS) and Johnson–Mehl–Avrami (JMA) method, respectively. The activation energy and kinetic exponent determined are almost constant, indicating a stable and slow speed of phase transition in the FCC Al0.25CoCrFeNi high-entropy alloy. During the main transformation process, the kinetic exponent shows that the phase transition is diffusion controlled process without nucleation during the transformation.

scholarly journals The effect of grain size on the annealing-induced phase transformation in an Al0·3CoCrFeNi high entropy alloy

2016 ◽  
Vol 105 ◽  
pp. 381-385 ◽  
Author(s):  
Qunhua Tang ◽  
Yi Huang ◽  
Hu Cheng ◽  
Xiaozhou Liao ◽  
Terence G. Langdon ◽  
...  
Keyword(s):  
Grain Size ◽  
Phase Transformation ◽  
High Entropy Alloy ◽  
High Entropy

scholarly journals Cryogenic-deformation-induced phase transformation in an FeCoCrNi high-entropy alloy

2018 ◽  
Vol 6 (4) ◽  
pp. 236-243 ◽  
Author(s):  
Qingyun Lin ◽  
Junpeng Liu ◽  
Xianghai An ◽  
Hao Wang ◽  
Yong Zhang ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Cryogenic Deformation

scholarly journals Deformation-induced crystalline-to-amorphous phase transformation in a CrMnFeCoNi high-entropy alloy

2021 ◽  
Vol 7 (14) ◽  
pp. eabe3105
Author(s):  
Hao Wang ◽  
Dengke Chen ◽  
Xianghai An ◽  
Yin Zhang ◽  
Shijie Sun ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Amorphous Phase ◽  
Structural Evolution ◽  
Crack Tip ◽  
Dislocation Slip ◽  
High Entropy Alloy ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Dislocation Glide ◽  
Ultrafine Grained

The Cantor high-entropy alloy (HEA) of CrMnFeCoNi is a solid solution with a face-centered cubic structure. While plastic deformation in this alloy is usually dominated by dislocation slip and deformation twinning, our in situ straining transmission electron microscopy (TEM) experiments reveal a crystalline-to-amorphous phase transformation in an ultrafine-grained Cantor alloy. We find that the crack-tip structural evolution involves a sequence of formation of the crystalline, lamellar, spotted, and amorphous patterns, which represent different proportions and organizations of the crystalline and amorphous phases. Such solid-state amorphization stems from both the high lattice friction and high grain boundary resistance to dislocation glide in ultrafine-grained microstructures. The resulting increase of crack-tip dislocation densities promotes the buildup of high stresses for triggering the crystalline-to-amorphous transformation. We also observe the formation of amorphous nanobridges in the crack wake. These amorphization processes dissipate strain energies, thereby providing effective toughening mechanisms for HEAs.

Effect of phase transformation on densification kinetics and properties of spark plasma sintered Al0.7CoCrFeNi high-entropy alloy

2020 ◽  
Vol 160 ◽  
pp. 110098 ◽  
Author(s):  
Siyao Xie ◽  
Ruidi Li ◽  
Tiechui Yuan ◽  
Mei Zhang ◽  
Minbo Wang ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Spark Plasma
Sign in / Sign up

Export Citation Format

Share Document