Phase stability of Ti-containing high-entropy alloys with a bcc or hcp structure

Yamabe‐Mitarai, Yoko; Yanao, Ko; Toda, Yoshiaki; Ohnuma, Ikuo; Matsunaga, Takuya

doi:10.1016/j.jallcom.2022.164849

Cited by 17 publications

(4 citation statements)

References 32 publications

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“…The plasticity of the alloy can be improved by reducing the average VEC, as shown by previous studies [4][5][6] . For refractory metal elements, the VEC of the Zr element is 4, which is lower than the average VEC of other refractory elements.…”

Section: Introductionmentioning

confidence: 77%

Effect of Zr content on microstructure and mechanical properties of MoNbTaTiZr_x refractory high-entropy alloy

Zhang,

2024

J. Phys.: Conf. Ser.

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The purpose of this paper is to explore how Zr content affects the crystal structure, micro-morphology, and mechanical properties of (MoNbTaTi) 100-xZrx alloys (x = 5,15,25). The results reveal that with the varying Zr contents, the alloy changes from a single-phase solid solution structure of Zr5 to a solid solution structure of Zr15 and Zr25 with a double BCC phase. Higher Zr levels lead to more pronounced elemental segregation, particularly, which makes Zr element enriched in the interdendritic region, and with the increase of segregation degree, the second phase separates between dendrites. In other words, Zr and Ti elements are densely distributed in the BCC2 phase. With the formation of the BCC2 phase, the mechanical properties of the alloy also changed obviously. Notably, as the Zr content rises, the alloy’s hardness and strength improve, while its ductility initially decreases before subsequently increasing. The Zr15 alloy was in a transition period of a two-phase structure, and the two-phase structure was not stable at this time, which led to a decrease in the plasticity of the alloy. The yield strength of Zr25 alloy is 1595 Mpa, the Vickers hardness is 542 HV, and the compressive fracture strain is 29%, showing the best comprehensive properties.

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Section: Introductionmentioning

confidence: 77%

Effect of Zr content on microstructure and mechanical properties of MoNbTaTiZr_x refractory high-entropy alloy

Zhang,

2024

J. Phys.: Conf. Ser.

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“…Zhang et al proposed that phase formation of HEA can be separated by mixing enthalpy ∆H mix and atomic-size difference δ, it provides important guidance in designing HEAs with desired phases and microstructure [25]. Yamabe-Mitarai et al studied the stability of Ti-containing high-entropy alloys, it was found that strengths of the BCC HEAs were greater than those of the HCP HEAs at 873 K, they were also greater than that of the commercial Ti alloy TIMETAL 834, indicating that BCC HEAs may be applied at elevated temperatures [26]. Uporov et al found that ScGdTbDyHo HEA possesses good magnetocaloric properties and it can be influenced by the synthesis route [27].…”

Section: Introductionmentioning

confidence: 99%

Composition Design Strategy for High Entropy Amorphous Alloys

Ding,

Zhang,

Yao

2024

Materials

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High entropy amorphous alloys (HEAAs) are materials that have received much attention in recent years. They exhibit many unique properties; however, research on their composition design method has not been deep enough. In this paper, we summarized some effective composition design strategies for HEAAs. By adjusting the atomic ratio from quinary bulk metallic glasses, Ti20Zr20Cu20Ni20Be20 HEAA with a high fracture strength of 2315 MPa was designed. By similar element addition/substitution, a series of Ti–(Zr, Hf, Nb)–Cu–Ni–Be HEAAs was developed. They possess good glass-forming ability with a maximum critical diameter of 30 mm. Combining elements from those ternary/quaternary bulk metallic glasses has also proved to be an effective method for designing new HEAAs. The effect of high entropy on the property of the alloy, possible composition design methods, and potential applications were also discussed. This paper may provide helpful inspiration for future development of HEAAs.

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“…The concept of multi-component alloys (MCAs) breaks the design bottleneck of traditional alloys with single or two main elements and has been explored extensively over the past two decades [1][2][3][4]. Initially, MCAs were studied based on single FCC, BCC or HCP structures, and the designed single-phase MCAs exhibited better mechanical and physicochemical properties than traditional alloys [5][6][7][8][9][10]. However, in recent years, research focus has gradually changed to dual-phase MCAs, and the heterophase structure was intentionally beneficial for improving the mechanical properties of alloys [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Annealing and Double Aging on the Microstructure and Mechanical Properties of Hot-Rolled Al17Cr10Fe36Ni36Mo1 Alloy

Qiu,

Shi,

Liu

et al. 2024

Metals

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AlCrFeNi multi-component alloys with excellent mechanical properties have been designed and extensively investigated in recent years. The massive fabrication of sheets will be an effective way for industrial application, where hot rolling is the inevitable process. After hot rolling, the mechanical properties could be further tailored. In this study, the effects of heat treatments on a dual-phase Al17Cr10Fe36Ni36Mo1 hot-rolled plate were systematically investigated, including: (i) annealing (700 °C, 850 °C, 1000 °C and 1150 °C for 1 h, respectively), (ii) solution and single aging (1150 °C for 1 h and 700 °C for 4 h), (iii) solution and double aging (1150 °C for 1 h, 700 °C for 4 h and 650 °C for 1 h). The B2 precipitates with varied morphologies were observed in the FCC matrix of the hot-rolled alloy after a heat treatment range from 700 °C to 1000 °C for 1 h, and the BCC particles in the B2 matrix were dissolved when the heat treatment temperature was higher than 1000 °C. The hot-rolled alloy heat treated at 700 °C for 1 h had the highest yield strength, and the hot-rolled alloy treated at 1150 °C for 1 h showed the lowest yield strength. After a solution at 1150 °C for 1 h, aging at 700 °C for 4 h and 650 °C for 1 h, the L12 phase and BCC particles were precipitated in the FCC and B2 matrices, and B2 nanoprecipitates were observed around the FCC grain boundaries. The solution and double aging alloy exhibit the tensile strength of 1365.7 ± 9.5 MPa, a fracture elongation of 14.2 ± 1.5% at 20 °C, a tensile strength of 641.4 ± 6.0 MPa, and a fracture elongation of 16.9 ± 1.0% at 700 °C, showing great potential for application.

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Phase stability of Ti-containing high-entropy alloys with a bcc or hcp structure

Cited by 17 publications

References 32 publications

Effect of Zr content on microstructure and mechanical properties of MoNbTaTiZr_x refractory high-entropy alloy

Effect of Zr content on microstructure and mechanical properties of MoNbTaTiZr_x refractory high-entropy alloy

Composition Design Strategy for High Entropy Amorphous Alloys

Effect of Annealing and Double Aging on the Microstructure and Mechanical Properties of Hot-Rolled Al17Cr10Fe36Ni36Mo1 Alloy

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Phase stability of Ti-containing high-entropy alloys with a bcc or hcp structure

Cited by 17 publications

References 32 publications

Effect of Zr content on microstructure and mechanical properties of MoNbTaTiZrx refractory high-entropy alloy

Effect of Zr content on microstructure and mechanical properties of MoNbTaTiZrx refractory high-entropy alloy

Composition Design Strategy for High Entropy Amorphous Alloys

Effect of Annealing and Double Aging on the Microstructure and Mechanical Properties of Hot-Rolled Al17Cr10Fe36Ni36Mo1 Alloy

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Product

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Effect of Zr content on microstructure and mechanical properties of MoNbTaTiZr_x refractory high-entropy alloy

Effect of Zr content on microstructure and mechanical properties of MoNbTaTiZr_x refractory high-entropy alloy