Achieving Gradient Martensite Structure and Enhanced Mechanical Properties in a Metastable β Titanium Alloy

Ma, Xinkai; Li, Fuguo; Sun, Zhimei; Hou, Junhua; Fang, Xiaotian; Zhu, Yuntian; Koch, Carl C.

doi:10.1007/s11661-019-05157-5

Cited by 28 publications

(16 citation statements)

References 51 publications

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“…2(b). The similar results have been also displayed in the studies carried out by Ma et al [7] and Wu et al [8]. The α" martensite and dislocation proliferate significantly when the preshock stress rises to 10 GPa, as shown in Fig.…”

Section: Discussionsupporting

confidence: 87%

Effect of shock-induced substructure evolution on the dynamic reloading mechanical behavior of Ti-17 alloy

Tan

Ren

2022

J. Phys.: Conf. Ser.

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The effect of shock-induced substructure evolution on the dynamic reloading mechanical behavior of a metastable β titanium alloy, Ti-5Al-2Sn-2Zr-4Mo-4Cr (Ti-17), was systematically investigated in this paper. The preshock treatment with the shock stress amplitude of 6, 10 and 14 GPa were applied on the Ti-17 alloy with equiaxed β microstructure. Then the dynamic reloading tests at strain rate of 3000 s-1 were carried out on these shock-prestrained samples. The results show that, the shock-induced substructure in Ti-17 with equiaxed β microstructure involves shock-induced α" martensite, shock-induced ω phase, dislocation proliferation and slip band. The shock-induced substructure evolution directly influences the mechanical properties of Ti-17 alloy during dynamic reloading.

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Section: Discussionsupporting

confidence: 87%

Effect of shock-induced substructure evolution on the dynamic reloading mechanical behavior of Ti-17 alloy

Tan

Ren

2022

J. Phys.: Conf. Ser.

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“…3. A similar vein pattern was observed on the fracture surface of a TRIP β metastable Ti alloy 37 , mistakenly identified as shallow dimples, and on the fracture surface of a nanostructured Ti alloy failing by shear banding 38 , even though it was not for the same conditions of testing or the same level of deformation. It can therefore be anticipated that the original fracture mechanism of Ti-12Mo (wt.%) is not restricted to this alloy but is shared by more βÀ metastable Ti alloys.…”

Section: Resultssupporting

confidence: 52%

“…However, in these alloys, the smaller damage resistance induces a damage-dominated ductile failure and prevents the unusual fracture sequence observed in the Ti-12Mo alloy. The same fracture mechanism involving local melting and dynamic recrystallization could nevertheless happen in many other highly ductile Ti alloys including the recently designed TRIP-TWIP Ti alloys [3][4][5]7,43 as implied by the similar fracture surface of a TRIP β-metastable Ti alloy 37 , opening a path for fracture properties improvements.…”

Section: Discussionmentioning

confidence: 77%

High temperature rise dominated cracking mechanisms in ultra-ductile and tough titanium alloy

et al. 2020

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Extensive use of titanium alloys is partly hindered by a lack of ductility, strain hardening, and fracture toughness. Recently, several β-metastable titanium alloys were designed to simultaneously activate both transformation-induced plasticity and twinning-induced plasticity effects, resulting in significant improvements to their strain hardening capacity and resistance to plastic localization. Here, we report an ultra-large fracture resistance in a Ti-12Mo alloy (wt.%), that results from a high resistance to damage nucleation, with an unexpected fracture phenomenology under quasi-static loading. Necking develops at a large uniform true strain of 0.3 while fracture initiates at a true fracture strain of 1.0 by intense through-thickness shear within a thin localized shear band. Transmission electron microscopy reveals that dynamic recrystallization occurs in this band, while local partial melting is observed on the fracture surface. Shear band temperatures of 1250-2450°C are estimated by the fusible coating method. The reported high ductility combined to the unconventional fracture process opens alternative avenues toward Ti alloys toughening.

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“…The redistribution of the concentration of alloying elements, the formation of martensitic phases, and an increase in the dispersion of the structure affect the level of plastic and strength characteristics. The presence of a gradient microstructure along the depth of the material surface layer can provide a better combination of mechanical properties in comparison to materials with a homogeneous structure [36,44]. In the present work, it was found that the exposure of PIB leads to an increase in the values of microand nanohardness, which is caused by the formation of a gradient nanostructured state (Figure 4) and the formation of a metastable phase α'.…”

Section: Discussionsupporting

confidence: 47%

Surface Modification of the EBM Ti-6Al-4V Alloy by Pulsed Ion Beam

Pushilina

Stepanova

Stepanov

et al. 2021

Metals

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The effect of surface modification of Ti-6Al-4V samples manufactured by electron beam melting (EBM) using a pulsed carbon ion beam is studied in the present work. Based on the results of XRD, SEM, and TEM analysis, patterns of changes in the microstructure and phase composition of the EBM Ti-6Al-4V alloy, depending on the number of pulses of pulsed ion beam exposure, are revealed. It was found that gradient microstructure is formed as a result of pulsed ion beam irradiation of the EBM Ti-6Al-4V samples. The microstructure of the surface layer up to 300 nm thick is represented by the (α + α”) phase. At depths of 0.3 μm, the microstructure is mixed and contains alpha-phase plates and needle-shaped martensite. The mechanical properties were investigated using methods of uniaxial tensile tests, micro- and nanohardness measurements, and tribological tests. It was shown that surface modification by a pulsed ion beam at an energy density of 1.92 J/cm2 and five pulses leads to an increase in the micro- and nanohardness of the surface layers, a decrease in the wear rate, and a slight rise in the plasticity of EBM Ti-6Al-4V alloy.

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Achieving Gradient Martensite Structure and Enhanced Mechanical Properties in a Metastable β Titanium Alloy

Cited by 28 publications

References 51 publications

Effect of shock-induced substructure evolution on the dynamic reloading mechanical behavior of Ti-17 alloy

Effect of shock-induced substructure evolution on the dynamic reloading mechanical behavior of Ti-17 alloy

High temperature rise dominated cracking mechanisms in ultra-ductile and tough titanium alloy

Surface Modification of the EBM Ti-6Al-4V Alloy by Pulsed Ion Beam

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