Journal ArticleDOI
Metastable high-entropy dual-phase alloys overcome the strength–ductility trade-off
TLDR
In this metastability-engineering strategy, a transformation-induced plasticity-assisted, dual-phase high-entropy alloy (TRIP-DP-HEA) is designed, which combines the best of two worlds: extensive hardening due to the decreased phase stability known from advanced steels and massive solid-solution strengthening of high-ENTropy alloys.Abstract:
Metals have been mankind's most essential materials for thousands of years; however, their use is affected by ecological and economical concerns Alloys with higher strength and ductility could alleviate some of these concerns by reducing weight and improving energy efficiency However, most metallurgical mechanisms for increasing strength lead to ductility loss, an effect referred to as the strength-ductility trade-off Here we present a metastability-engineering strategy in which we design nanostructured, bulk high-entropy alloys with multiple compositionally equivalent high-entropy phases High-entropy alloys were originally proposed to benefit from phase stabilization through entropy maximization Yet here, motivated by recent work that relaxes the strict restrictions on high-entropy alloy compositions by demonstrating the weakness of this connection, the concept is overturned We decrease phase stability to achieve two key benefits: interface hardening due to a dual-phase microstructure (resulting from reduced thermal stability of the high-temperature phase); and transformation-induced hardening (resulting from the reduced mechanical stability of the room-temperature phase) This combines the best of two worlds: extensive hardening due to the decreased phase stability known from advanced steels and massive solid-solution strengthening of high-entropy alloys In our transformation-induced plasticity-assisted, dual-phase high-entropy alloy (TRIP-DP-HEA), these two contributions lead respectively to enhanced trans-grain and inter-grain slip resistance, and hence, increased strength Moreover, the increased strain hardening capacity that is enabled by dislocation hardening of the stable phase and transformation-induced hardening of the metastable phase produces increased ductility This combined increase in strength and ductility distinguishes the TRIP-DP-HEA alloy from other recently developed structural materials This metastability-engineering strategy should thus usefully guide design in the near-infinite compositional space of high-entropy alloysread more
Citations
More filters
Journal ArticleDOI
High-entropy alloys
TL;DR: This Review discusses model high-entropy alloys with interesting properties, the physical mechanisms responsible for their behaviour and fruitful ways to probe and discover new materials in the vast compositional space that remains to be explored.
Journal ArticleDOI
Additively manufactured hierarchical stainless steels with high strength and ductility
Y. Morris Wang,Thomas Voisin,Joseph T. McKeown,Jianchao Ye,Nicholas P. Calta,Zan Li,Zhi Zeng,Yin Zhang,Wen Chen,Tien T. Roehling,Ryan T. Ott,Melissa K. Santala,Philip J. Depond,Manyalibo J. Matthews,Alex V. Hamza,Ting Zhu +15 more
TL;DR: The potential of additive manufacturing to create alloys with unique microstructures and high performance for structural applications is demonstrated, with austenitic 316L stainless steels additively manufactured via a laser powder-bed-fusion technique exhibiting a combination of yield strength and tensile ductility that surpasses that of conventional 316L steels.
Journal ArticleDOI
Enhanced strength and ductility in a high-entropy alloy via ordered oxygen complexes
Zhifeng Lei,Xiongjun Liu,Yuan Wu,Hui Wang,Suihe Jiang,S. D. Wang,Xidong Hui,Yidong Wu,Baptiste Gault,Paraskevas Kontis,Dierk Raabe,Lin Gu,Qinghua Zhang,Houwen Chen,Hongtao Wang,Jiabin Liu,Ke An,Qiaoshi Zeng,T.G. Nieh,Zhaoping Lu +19 more
TL;DR: It is shown that oxygen can take the form of ordered oxygen complexes, a state in between oxide particles and frequently occurring random interstitials, which lead to unprecedented enhancement in both strength and ductility in compositionally complex solid solutions, the so-called high-entropy alloys (HEAs).
Journal ArticleDOI
Carbothermal shock synthesis of high-entropy-alloy nanoparticles
Yonggang Yao,Zhennan Huang,Pengfei Xie,Steven D. Lacey,Rohit J. Jacob,Hua Xie,Fengjuan Chen,Anmin Nie,Tiancheng Pu,Miles C. Rehwoldt,Daiwei Yu,Michael R. Zachariah,Chao Wang,Reza Shahbazian-Yassar,Ju Li,Liangbing Hu +15 more
TL;DR: A general route for alloying up to eight dissimilar elements into single-phase solid-solution nanoparticles, referred to as high-entropy-alloy nanoparticles (HEA-NPs), by thermally shocking precursor metal salt mixtures loaded onto carbon supports is presented.
Journal ArticleDOI
Multicomponent intermetallic nanoparticles and superb mechanical behaviors of complex alloys
Tao Yang,Yilu Zhao,Yang Tong,Zengbao Jiao,Jie Wei,J. X. Cai,Xiaodong Han,Da Chen,Alice Hu,Ji-Jung Kai,Kathy Lu,Y. Liu,C.T. Liu +12 more
TL;DR: A strategy to break this trade-off by controllably introducing high-density ductile multicomponent intermetallic nanoparticles (MCINPs) in complex alloy systems is reported, which offers a paradigm to develop next-generation materials for structural applications.
References
More filters
Journal ArticleDOI
Nanostructured High-Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes
Jien-Wei Yeh,Swe-Kai Chen,Su-Jien Lin,Jon-Yiew Gan,Tsung-Shune Chin,Tsung-Shune Chin,Tao-Tsung Shun,Chun-Huei Tsau,Shou-Yi Chang +8 more
TL;DR: A new approach for the design of alloys is presented in this paper, where high-entropy alloys with multi-principal elements were synthesized using well-developed processing technologies.
Journal ArticleDOI
Microstructures and properties of high-entropy alloys
TL;DR: The concept of high entropy introduces a new path of developing advanced materials with unique properties, which cannot be achieved by the conventional micro-alloying approach based on only one dominant element as mentioned in this paper.
Journal ArticleDOI
A fracture-resistant high-entropy alloy for cryogenic applications
Bernd Gludovatz,Anton Hohenwarter,Dhiraj Catoor,Edwin H. Chang,Easo P. George,Easo P. George,Robert O. Ritchie,Robert O. Ritchie +7 more
TL;DR: This work examined a five-element high-entropy alloy, CrMnFeCoNi, which forms a single-phase face-centered cubic solid solution, and found it to have exceptional damage tolerance with tensile strengths above 1 GPa and fracture toughness values exceeding 200 MPa·m1/2.
Journal ArticleDOI
The conflicts between strength and toughness
TL;DR: This work focuses on the interplay between the mechanisms that individually contribute to strength and toughness, noting that these phenomena can originate from very different lengthscales in a material's structural architecture.
Journal ArticleDOI
The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy
F. Otto,F. Otto,Antonín Dlouhý,Christoph Somsen,Hongbin Bei,Gunther Eggeler,Easo P. George,Easo P. George +7 more
TL;DR: In this article, an equiatomic CoCrFeMnNi high-entropy alloy, which crystallizes in the face-centered cubic (fcc) crystal structure, was produced by arc melting and drop casting.