scholarly journals Development of Light-Weight TRIP/TWIP FCC High Entropy Alloy with High Specific Strength and Large Ductility

2021 ◽  
Vol 59 (12) ◽  
pp. 857-869
Author(s):  
Kook Noh Yoon ◽  
Hyun Seok Oh ◽  
Je In Lee ◽  
Eun Soo Park
Keyword(s):  
Transition Metals ◽  
Single Phase ◽  
High Entropy Alloy ◽  
Dual Phase ◽  
Strengthening Effect ◽  
Light Weight ◽  
Atomic Size ◽  
High Entropy ◽  
Specific Strength ◽  
High Specific Strength

In this study we developed a novel (TRIP+TWIP) high entropy alloy (HEA) with high specific strength and large ductility. First, by controlling the atomic constitution of the 3d transition metals (Cr, Mn, Fe, Co, and Ni), we designed a light-weight TRIP-assisted dual-phase HEA with a non-equiatomic composition of Cr22Mn6Fe40Co26Ni6, which exhibited 5% lighter density than the Cantor HEA. Secondly, we systematically added Al (a lightweight element (2.7 g/cm3), which has a large atomic size misfit with 3d transition metals, and Ferrite stabilizer) up to 5 at.% in Cr22Mn6Fe40Co26Ni6 HEA. With increasing Al content, the phase constitution of the alloy changed from a dual-phase of FCC and HCP (0 to 2.0 at.%) to a FCC single-phase (2.5 to 3.5 at.%), to a dual-phase of FCC and BCC (4.0 to 5.0 at.%). In particular, the (Cr22Mn6Fe40Co26Ni6)97.5Al2.5 HEA with the FCC single-phase exhibited a large Hall-Petch coefficient and relatively lower thermal conductivity due to its three times larger atomic size mismatch (δ) than the Cantor HEA, which causes the superior solid solution strengthening effect. Furthermore, the (Cr22Mn6Fe40Co26Ni6)96Al4.0 HEA, a boundary composition of BCC precipitation in the FCC phase, exhibited a 10% higher specific strength than the Cantor HEA as well as 50% larger strain, due to the unique TRIP and TWIP complex deformation mechanism. This result shows that the addition of Al in Cr22Mn6Fe40Co26Ni6 HEA can result not only in greater chemical complexity due to the multicomponent high entropy compositions, but also microstructural complexity due to the increase in competing crystalline phases. The confusion effect caused by both complexities lets the alloy overcome the trade-off relationship among conflicting intrinsic properties, such as strength versus ductility (or density). Consequently, these results pave the way for a new design strategy of a novel (TRIP+TWIP) HEA with high specific strength and large ductility.

Chemical evolution-induced strengthening on AlCoCrNi dual-phase high-entropy alloy with high specific strength

2019 ◽  
Vol 777 ◽  
pp. 828-834 ◽  
Author(s):  
Elyorjon Jumaev ◽  
Sung Hwan Hong ◽  
Jeong Tae Kim ◽  
Hae Jin Park ◽  
Young Seok Kim ◽  
...  
Keyword(s):  
Chemical Evolution ◽  
High Entropy Alloy ◽  
Dual Phase ◽  
High Entropy ◽  
Specific Strength ◽  
High Specific Strength

A novel light-weight refractory high-entropy alloy with high specific strength and intrinsic deformability

2021 ◽  
Vol 287 ◽  
pp. 129255
Author(s):  
X.W. Liu ◽  
Z.C. Bai ◽  
X.F. Ding ◽  
J.Q. Yao ◽  
L. Wang ◽  
...  
Keyword(s):  
High Entropy Alloy ◽  
Light Weight ◽  
High Entropy ◽  
Specific Strength ◽  
High Specific Strength

An AlNbTiVZr0.5 high-entropy alloy combining high specific strength and good ductility

2015 ◽  
Vol 161 ◽  
pp. 136-139 ◽  
Author(s):  
N.D. Stepanov ◽  
N.Yu Yurchenko ◽  
V.S. Sokolovsky ◽  
M.A. Tikhonovsky ◽  
G.A. Salishchev
Keyword(s):  
High Entropy Alloy ◽  
High Entropy ◽  
Good Ductility ◽  
Specific Strength ◽  
High Specific Strength

Ductile Ti1.5ZrNbAl0.3 refractory high entropy alloy with high specific strength

2021 ◽  
Vol 290 ◽  
pp. 129428
Author(s):  
Jingyu Pang ◽  
Hongwei Zhang ◽  
Long Zhang ◽  
Zhengwang Zhu ◽  
Huameng Fu ◽  
...  
Keyword(s):  
High Entropy Alloy ◽  
High Entropy ◽  
Specific Strength ◽  
High Specific Strength

scholarly journals Magnetic and Transport Properties of New Dual-Phase High-Entropy Alloy FeRhIrPdPt

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2877
Author(s):  
Kohei Baba ◽  
Naoki Ishizu ◽  
Terukazu Nishizaki ◽  
Jiro Kitagawa
Keyword(s):  
Glass Transition ◽  
Transition Metals ◽  
Spin Glass ◽  
Transport Properties ◽  
High Entropy Alloy ◽  
Dual Phase ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Spin Glass Transition ◽  
Face Centered

High-entropy alloys (HEAs) are broadly explored from the perspective of mechanical, corrosion-resistance, catalytic, structural, superconducting, magnetic properties, and so on. In magnetic HEAs, 3d transition metals or rare-earth elements are well-studied compositional elements. We researched a magnetic HEA containing Fe combined with 4d and 5d transition metals, which has not been well investigated, and found a new dual-phase face-centered-cubic (fcc) HEA FeRhIrPdPt. The structural, magnetic, and transport properties were evaluated by assuming that FeRhIrPdPt is a mixture of FeRh4, FeIr4, FePd4, and FePt4, all with the fcc structure. The dual-phase is composed of a Rh- and Ir-rich main phase and a Pd- and Pt-rich minor one. FeRh4 and FeIr4 show spin freezings at low temperatures, while FePd4 and FePt4 are ferromagnetic. Two magnetic features can characterize FeRhIrPdPt. One is the canonical spin-glass transition at 90 K, and the other is a ferromagnetic correlation that appears below 300 K. The main and minor phases were responsible for the spin-glass transition and the ferromagnetic correlation below 300 K, respectively.

scholarly journals Contrasting mechanical behavior in precipitation hardenable AlXCoCrFeNi high entropy alloy microstructures: Single phase FCC vs. dual phase FCC-BCC

2019 ◽  
Vol 739 ◽  
pp. 158-166 ◽  
Author(s):  
Sindhura Gangireddy ◽  
Bharat Gwalani ◽  
Vishal Soni ◽  
Rajarshi Banerjee ◽  
Rajiv S. Mishra
Keyword(s):  
Mechanical Behavior ◽  
Single Phase ◽  
High Entropy Alloy ◽  
Dual Phase ◽  
High Entropy

A review on phase prediction in high entropy alloys

2021 ◽  
pp. 095440622110089
Author(s):  
Vinay Kumar Soni ◽  
S Sanyal ◽  
K Raja Rao ◽  
Sudip K Sinha
Keyword(s):  
Solid Solution ◽  
Phase Formation ◽  
Single Phase ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
Modeling Tools ◽  
High Entropy ◽  
Recent Developments ◽  
Phase Prediction ◽  
The Stability

The formation of single phase solid solution in High Entropy Alloys (HEAs) is essential for the properties of the alloys therefore, numerous approach were proposed by many researchers to predict the stability of single phase solid solution in High Entropy Alloy. The present review examines some of the recent developments while using computational intelligence techniques such as parametric approach, CALPHAD, Machine Learning etc. for prediction of various phase formation in multicomponent high entropy alloys. A detail study of this data-driven approaches pertaining to the understanding of structural and phase formation behaviour of a new class of compositionally complex alloys is done in the present investigation. The advantages and drawbacks of the various computational are also discussed. Finally, this review aims at understanding several computational modeling tools complying the thermodynamic criteria for phase formation of novel HEAs which could possibly deliver superior mechanical properties keeping an aim at advanced engineering applications.

Design and deformation characteristics of single-phase Co-Cr-Fe-Ni-V high entropy alloy

2021 ◽  
pp. 161579
Author(s):  
Reliance Jain ◽  
M.R. Rahul ◽  
Poulami Chakraborty ◽  
Rama Krushna Sabat ◽  
Sumanta Samal ◽  
...  
Keyword(s):  
Single Phase ◽  
High Entropy Alloy ◽  
Deformation Characteristics ◽  
High Entropy
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