Effects of Nb on deformation-induced transformation and mechanical properties of HfNbxTa0.2TiZr high entropy alloys

Wen, Xiaocan; Wu, Yuan; Huang, Hailong; Jiang, Suihe; Wang, Hui; Liu, Xiongjun; Zhang, Yong; Wang, Xianzhen

doi:10.1016/j.msea.2021.140798

Cited by 33 publications

(6 citation statements)

References 42 publications

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“…Now, except for the equiatomic case, for which 0 < T d0 < 1, we find a negative T d0 , which gets smaller as the Ta-Nb fraction is reduced. This trend is also consistent with experiments (54,63), whose details are summarized in Table S2 of the SM. Finally, the last group is made of the quaternary Ti-Zr-Nb-Ta alloys, for which we find T d0 increasing upon increasing the fraction of Zr, Nb and Ta.…”

Section: Derivative Of the Characteristic Temperatures As Stability D...supporting

confidence: 90%

Towards quantifying (meta-)stability of multi-principal element alloys: from configurational entropy to characteristic temperatures

Zhang,

Zhou,

Dong

et al. 2023

Preprint

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Understanding the thermodynamics of multi-principal-element alloys (MPEAs), although crucial for their design, remains an elusive task. The configurational entropy, Sconf, is a critical thermodynamic quantity determining stability, but its calculation for real materials poses a hard computational challenge. Strong of a highly efficient cluster expansion, constructed on density functional theory data,and of an advanced sampling technique, we are able to compute Sconf over the huge configurational and compositional space of the prototype bcc Ti-Zr-Hf-Nb-Ta system. In particular, we explore around 200,000 atomic arrangements across more than 200 compositions. The main features of the computed Sconf-vs-temperature curves can be captured by the definition of two characteristic temperatures, which are then used to define a dimensionless descriptor. This, together with Sconf, enable us to rank alloys according to their (meta- )stability across a broad composition range, going from equiatomic to nonequiatomic, and even to the regions covered by conventional alloys. Such classification is informed and validated against hundreds of experimental results. Our analysis allows us to revise the classification scheme of alloys into high-entropy, medium-entropy and low-entropy and, in general, sheds light into the thermodynamic origin of their metastability, ultimately helping in the design and development.

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Section: Derivative Of the Characteristic Temperatures As Stability D...supporting

confidence: 90%

Towards quantifying (meta-)stability of multi-principal element alloys: from configurational entropy to characteristic temperatures

Zhang,

Zhou,

Dong

et al. 2023

Preprint

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“…In addition, SIMT improves the yield strength-ductility of Ti16Zr35Hf35Ta14 72 . Wen ( Wen et al, 2021b ) found that the Nb content in HfNbTa 0.2 TiZr HEA affects the stability of the BCC phase. With the decrease in Nb content, the martensite tends to transform from the BCC structure to the HCP structure, as shown in Figure 3A .…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“… (A) TEM bright-field images of the co-existed BCC and HCP phase ( Wen et al, 2021b ). (B) Selected area diffraction show the extra twinning spots (C) Four different scanning speeds at 4.0 m/s, 3.5 m/s, 3.0 m/s, 2.5 m/s for the SLM ( Xiao et al, 2022 ).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Medical high-entropy alloy: Outstanding mechanical properties and superb biological compatibility

Liu

Yang²,

Liu³

et al. 2022

Front. Bioeng. Biotechnol.

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Medical metal implants are required to have excellent mechanical properties and high biocompatibility to handle the complex human environment, which is a challenge that has always existed for traditional medical metal materials. Compared to traditional medical alloys, high entropy alloys (HEAs) have a higher design freedom to allow them to carry more medical abilities to suit the human service environment, such as low elastic modulus, high biocompatible elements, potential shape memory capability. In recent years, many studies have pointed out that bio-HEAs, as an emerging medical alloy, has reached or even surpassed traditional medical alloys in various medical properties. In this review, we summarized the recent reports on novel bio-HEAs for medical implants and divide them into two groups according the properties, namely mechanical properties and biocompatibility. These new bio-HEAs are considered hallmarks of a historic shift representative of a new medical revolution.

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“…[2] Many other studies mainly focused on the influence of additional elements on tribological and mechanical properties. Adding Al, [53][54][55][56] Cu, [20,57] Ti, [58] Nb, [59][60][61] TiB 2 , [62] graphene nanoplatelets, [63] micrographite and nanographene particles, [64] Co, [65,66] nitriding, [67] Pb and Bi, [68,69] Mo, [70,71] V, [72] Si, [56] Fe, [16] Zr, [33] and Ag [73] led to an improved tribological and mechanical performance at low and high temperature, while addition of Si [74] beyond a critical value led to an increased wear rate due to the reduction of compressive strength and fracture toughness. The wear resistance of Al0.25CoCrFeNiSi0.6 HEA with respect to the presence of Si was investigated by Olga et al [75] The microstructure of HEA was composed of two phases, high-entropy solid-solution matrix-holding FCC crystal structure and low-entropy Cr 3 Si intermetallic compound with BCC structure as the strengthening particle.…”

Section: Introductionmentioning

confidence: 99%

A Study on Outstanding High‐Temperature Wear Resistance of High‐Entropy Alloys

2023

Self Cite

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Wear property is a main reason for failure, especially for those parts which are mechanically moving and interacting with each other in industrial utilization. High‐entropy alloys (HEAs) are considered promising candidates to possess outstanding tribological factors of performance at high temperatures compared with conventional engineering alloys, which have drawn much attention from academic and industrial points of view. This study is performed to survey the influence of microstructure, grain size, precipitation, reinforcement, and elements addition on the wear resistance of HEAs over a wide temperature range. In this respect, the worn microstructure, wear rate, friction coefficient, hardness, wear track, and subsurface are precisely checked. This review also explores the high‐temperature wear resistance of thermally sprayed and additively manufactured HEAs associated with emphasizing the dominant wear mechanisms through in a wide range of temperatures.

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Effects of Nb on deformation-induced transformation and mechanical properties of HfNbxTa0.2TiZr high entropy alloys

Cited by 33 publications

References 42 publications

Towards quantifying (meta-)stability of multi-principal element alloys: from configurational entropy to characteristic temperatures

Towards quantifying (meta-)stability of multi-principal element alloys: from configurational entropy to characteristic temperatures

Medical high-entropy alloy: Outstanding mechanical properties and superb biological compatibility

A Study on Outstanding High‐Temperature Wear Resistance of High‐Entropy Alloys

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