Controlling the microstructure and fracture toughness of the Ti–5Al–5Mo–5V–1Cr–1Fe alloy by multiple heat treatments

Liu, Zedong; Du, Zhongjie; Jiang, Hanyu; Zhao, Xueping; Gong, Tianhao; Cui, Xiaoming; Cheng, Jianwei; Liu, Fei; Chen, Wenzhen

doi:10.1016/j.jmrt.2022.02.020

Cited by 22 publications

(11 citation statements)

References 49 publications

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“…In the unstable propagation stage, the deflection angle of crack growth path changed greatly. Liu et al [44] also reported a similar phenomenon. And they found that the more ductile the metal, the more tortuous the crack propagation path.…”

Section: Tensile Behaviormentioning

confidence: 64%

Multi-wire arc additive manufacturing of TC4-Nb-NiTi bionic layered heterogeneous alloy: Microstructure evolution and mechanical properties

Jiang

Nie

Teng

et al. 2023

Materials Characterization

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Section: Tensile Behaviormentioning

confidence: 64%

Multi-wire arc additive manufacturing of TC4-Nb-NiTi bionic layered heterogeneous alloy: Microstructure evolution and mechanical properties

Jiang

Nie

Teng

et al. 2023

Materials Characterization

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“…Mine et al [40] also pointed out that the fine α phase could not affect the growth of the main crack, and the crack would be more inclined to cut through the α phase and expand forward, resulting in a very flat crack growth path. The higher the bending degree of the crack propagation path is, the higher the fracture toughness of the alloy [25]. In conclusion, cracks tend to propagate at the interior of the α phase (Figure 16a), while cracks tend to propagate at the fine α/β interface (Figure 16d).…”

Section: Effect Of Duplex Ageing On the Microstructure And Mechanical...mentioning

confidence: 87%

“…The quantity and density of α S gradually increase with an increasing second step ageing temperature, and α S has the largest number and the highest density of precipitation when ageing at 400 • C (Figure 7h). This is because the increase in temperature accelerates the diffusion rate, which is beneficial to the precipitation and faster growth of the α phase [25]. Figure 8 shows the quantitative analyses of the corresponding SEM images; the result indicated that more α p with larger size appeared in the single ageing process, and with the increase in duplex ageing temperature, the volume fraction of α p decreased from 6.38% to 1.77%, and the length decreased from 0.82-0.38µm.…”

Section: Microstructure Of the Duplex-aged Alloysmentioning

confidence: 99%

Regulation of Microstructure to Optimize Mechanical Properties of Ti-15Mo-3Al-2.7Nb-0.2Si via Solution-Duplex Ageing

Kang

Jiang

et al. 2023

Metals

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The production of alloys with high strength and toughness concurrently is still a difficult challenge. Here, we designed a simple solution-ageing heat treatment system to control the morphology and density of α in Ti-15Mo-3Al-2.7Nb-0.2Si via different heat treatment temperatures. The experimental results show that Ti-15Mo-3Al-2.7Nb-0.2Si exhibits a synergistic combination of tensile strength (1364 MPa), plasticity (7.8% elongation), and fracture toughness (101 MPa·m1/2) through solutions in the α/β biphasic region and duplex ageing. Notably, the strength of the alloy after the second step of the ageing process is increased by 15% compared with that after the first step of the ageing process. However, there is less than a 5% reduction in the fracture toughness. TEM observations show that the matrix continues to precipitate denser secondary α during duplex ageing, which causes the strength to increase significantly and causes the fracture toughness to weaken. Our work may provide a novel method to optimize the mechanical properties of alloys by controlling the precipitates.

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“…Also, the uniform and ultra-fine α s phases were obtained by solution plus duplex aging [33]. Liu et al [34] also reported a two-step aging treatment for a Ti55511 alloy and obtained the uniformly distributed α p and α s phases. In recent years, multi-stage treatment methods have been employed to optimize the mechanical properties of Ti alloys [35].…”

Section: Introductionmentioning

confidence: 99%

Effects of Aging Treatment on the Microstructures and Mechanical Properties of a TC18 Alloy

Zhang,

Lin,

Wang

et al. 2024

Materials

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In the present work, the effects of aging treatment on the microstructures of a TC18 alloy are studied. The influence of aging treatment on the tensile properties and failure mechanisms is systematically analyzed. It is found that the size and morphology of the primary α (αp) phases are insensitive to aging temperature and time. Furthermore, the aging temperature and time dramatically influence the precipitation of the secondary α (αs) phases. Massive αs phases precipitate and gradually coarsen, and finally weave together by increasing the aging temperature or extending the aging time. The variations in αp and αs phases induced by aging parameters also affect the mechanical properties. Both yield strength (YS) and ultimate tensile strength (UTS) first increase and then decrease by increasing the aging temperature and time, while ductility first decreases and then increases. There is an excellent balance between the strengths and ductility. When the aging temperature is changed from 450 to 550 °C, YS varies from 1238.6 to 1381.6 MPa, UTS varies from 1363.2 to 1516.8 MPa, and the moderate elongation ranges from 9.0% to 10.3%. These results reveal that the thickness of αs phases is responsible for material strengths, while the content of α phases can enhance material ductility. The ductile characteristics of the alloy with coarser αs phases are more obvious than those with thinner αs phases. Therefore, the aging treatment is helpful for the precipitation and homogeneous distribution of αs phases, which are essential for balancing the strengths and ductility of the studied Ti alloy.

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Controlling the microstructure and fracture toughness of the Ti–5Al–5Mo–5V–1Cr–1Fe alloy by multiple heat treatments

Cited by 22 publications

References 49 publications

Multi-wire arc additive manufacturing of TC4-Nb-NiTi bionic layered heterogeneous alloy: Microstructure evolution and mechanical properties

Multi-wire arc additive manufacturing of TC4-Nb-NiTi bionic layered heterogeneous alloy: Microstructure evolution and mechanical properties

Regulation of Microstructure to Optimize Mechanical Properties of Ti-15Mo-3Al-2.7Nb-0.2Si via Solution-Duplex Ageing

Effects of Aging Treatment on the Microstructures and Mechanical Properties of a TC18 Alloy

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