Effects of Al addition on the microstructure and mechanical property of AlxCoCrFeNi high-entropy alloys

Wang, Woei-Ren; Wang, Weilin; Wang, Shang-Chih; Tsai, Yi-Chia; Lai, Cheng-Chou; Yeh, Jien‐Wei

doi:10.1016/j.intermet.2012.03.005

Cited by 1,197 publications

(403 citation statements)

References 35 publications

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“…Of all the HEA systems reported, Al-Co-Cr-Cu-Fe-Ni [7,8,21,35,36,49,[60][61][62][63][64][65][66][67][68] and its Cu-free version Al-Co-Cr-Fe-Ni [69][70][71][72][73][74] have been studied most comprehensively. Most of the reported HEA systems emerge from them.…”

Section: Thementioning

confidence: 99%

“…In general, hardness of the FCC phase is between HV 100-200. [7,8,[70][71][72] Alloys having a sole FCC phase have ductilities between 20-60%, and usually exhibit significant work hardening. [62,63,69] Hardness of the BCC/B2 phase is typically between HV 500-600.…”

Section: Thementioning

confidence: 99%

“…[62,63,69] Hardness of the BCC/B2 phase is typically between HV 500-600. Because addition of Al triggers the formation of hard BCC/B2 phase, and hardness of the alloy increases with Al content [7,8,[70][71][72] (see Figure 3). Alloys having sole BCC/B2 phases probably have ductilities less than 5%.…”

Section: Thementioning

confidence: 99%

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High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

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2,622

853

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High-entropy alloys (HEAs) are alloys with five or more principal elements. Due to the distinct design concept, these alloys often exhibit unusual properties. Thus, there has been significant interest in these materials, leading to an emerging yet exciting new field. This paper briefly reviews some critical aspects of HEAs, including core effects, phases and crystal structures, mechanical properties, high-temperature properties, structural stabilities, and corrosion behaviors. Current challenges and important future directions are also pointed out.

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Section: Thementioning

confidence: 99%

Section: Thementioning

confidence: 99%

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High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

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853

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“…The as-cast phase chemistries are shown in Table 1. [32,35,39]. Similar to the Al 15 HEA, annealing caused significant coarsening of the microstructure.…”

Section: Microstructures Of the As-cast And Annealed Heasmentioning

confidence: 80%

“…This particular alloy system is ideal for a fundamental oxidation study since it contains both Al and Cr, which are known to produce protective Cr 2 O 3 and/or Al 2 O 3 scales [30]. Additionally, the AlCoCrFeNi system is one of the most thoroughly investigated to date [1,4,10,14,[31][32][33][34][35][36][37][38][39][40][41][42][43]. This paper will systematically report the influence of annealing on the microstructures and active oxidation mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Influence of Annealing on the Microstructures and Oxidation Behaviors of Al8(CoCrFeNi)92, Al15(CoCrFeNi)85, and Al30(CoCrFeNi)70 High-Entropy Alloys

Butler

Weaver

2016

Metals

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Abstract:The understanding of the oxidation behaviors of as-cast and annealed high-entropy alloys (HEAs) is currently limited. This work systematically investigates the influence of annealing on the microstructures and oxidation behaviors of AlCoCrFeNi-based HEAs. Annealing was found to alter the distribution of Al-rich phases which caused a change in the oxidation mechanisms. In general, all three of the investigated HEAs displayed some degree of transient oxidation at 1050 • C that was later followed by protective, parabolic oxide growth. The respective oxidation behaviors are discussed relative to existing oxide formation models for Ni-Cr-Al alloys.

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Phase Decomposition of a Single‐Phase AlTiVNb High‐Entropy Alloy after Severe Plastic Deformation and Annealing

Schuh¹,

Völker²,

Maier–Kiener³

et al. 2017

Adv Eng Mater

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An equiatomic AlTiVNb high-entropy alloy is deformed by high pressure torsion inducing a nanocrystalline microstructure. The samples then are subjected to isochronal heat treatments between 300 C and 1000 C. The hardness increase from %7.4 GPa for the as-processed state to 10.4 GPa for an annealing temperature of 700 C, while for higher temperatures the hardness starts to decrease. Furthermore, the reduced modulus increases after annealing treatments as well. It will be shown that the unusual annealing response can be related to the formation of intermetallic phases creating a multi-phase nanocomposite material during annealing. The results give new insights into the thermodynamic stability of this alloy, which are also relevant for coarser-grained microstructures.

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Effects of Al addition on the microstructure and mechanical property of AlxCoCrFeNi high-entropy alloys

Cited by 1,197 publications

References 35 publications

High-Entropy Alloys: A Critical Review

High-Entropy Alloys: A Critical Review

Influence of Annealing on the Microstructures and Oxidation Behaviors of Al8(CoCrFeNi)92, Al15(CoCrFeNi)85, and Al30(CoCrFeNi)70 High-Entropy Alloys

Phase Decomposition of a Single‐Phase AlTiVNb High‐Entropy Alloy after Severe Plastic Deformation and Annealing

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