Novel Mixed-Mode Phase Transition Involving a Composition-Dependent Displacive Component

Nag, S.; Devaraj, Arun; Srinivasan, Raghavan; Williams, R. E. A.; Gupta, Niraj; Viswanathan, G.B.; Tiley, J.; Banerjee, Shrestha; Srinivasan, S.; Fraser, HL; Banerjee, R.

doi:10.1103/physrevlett.106.245701

Cited by 120 publications

(63 citation statements)

References 14 publications

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“…%) alloy [137]. The bcc β-phase to embryonic ω-phase transformation was recently clarified to occur through a displacive-diffusional process [138][139][140]. These authors demonstrated that the formation of ω-phase-like embryos occurred through competing compositional and structural instabilities arising in the bcc lattice of model binary Ti-Mo alloys during rapid cooling from the high-temperature single β-phase field.…”

Section: Agingmentioning

confidence: 99%

A Review of Metastable Beta Titanium Alloys

Kolli

Devaraj

2018

Metals

462

175

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Abstract:In this article, we provide a broad and extensive review of beta titanium alloys. Beta titanium alloys are an important class of alloys that have found use in demanding applications such as aircraft structures and engines, and orthopedic and orthodontic implants. Their high strength, good corrosion resistance, excellent biocompatibility, and ease of fabrication provide significant advantages compared to other high performance alloys. The body-centered cubic (bcc) β-phase is metastable at temperatures below the beta transus temperature, providing these alloys with a wide range of microstructures and mechanical properties through processing and heat treatment. One attribute important for biomedical applications is the ability to adjust the modulus of elasticity through alloying and altering phase volume fractions. Furthermore, since these alloys are metastable, they experience stress-induced transformations in response to deformation. The attributes of these alloys make them the subject of many recent studies. In addition, researchers are pursuing development of new metastable and near-beta Ti alloys for advanced applications. In this article, we review several important topics of these alloys including phase stability, development history, thermo-mechanical processing and heat treatment, and stress-induced transformations. In addition, we address recent developments in new alloys, phase stability, superelasticity, and additive manufacturing.

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Section: Agingmentioning

confidence: 99%

A Review of Metastable Beta Titanium Alloys

Kolli

Devaraj

2018

Metals

462

175

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“…The combination of transmission electron microscopy (TEM) and atom probe tomography (APT) enables researchers to relate the atomic structure and composition of nanoscale features of interest and has been gaining influence over the past decades. Typically, correlative TEM/APT analyses have been carried out from distinct specimens from the same alloy, [1][2][3][4][5][6][7] which fails in cases where the microstructure is inhomogeneous and/or when targeting rare microstructural features for both TEM and APT investigations. As recently reviewed by Herbig,8 full electron microscopy characterization of specific features can be carried out on needle-shaped specimens prior to APT analysis by utilizing specially designed holders.…”

Section: Introductionmentioning

confidence: 99%

Correlative Microscopy—Novel Methods and Their Applications to Explore 3D Chemistry and Structure of Nanoscale Lattice Defects: A Case Study in Superalloys

Makineni

Lenz

Kontis

et al. 2018

JOM

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“…phase forms during ageing at temperatures below 823 K (Sikka et al, 1982;Ahmed et al, 2015). It also possesses a specific OR with the matrix (Furuhara et al, 2001) and produces diffraction spots at the 1/3{112} and 2/3{112} diffraction positions (Ng et al, 2011;Lai et al, 2015;Tane et al, 2013). As for the 0 (hexagonal) and the 00 (orthorhombic) phases, the two kinds of martensite, they generally form with an acicular or plate shape during rapid cooling from a temperature above or near T .…”

Section: Introductionmentioning

confidence: 99%

The origin of striation in the metastable β phase of titanium alloys observed by transmission electron microscopy

Fan

Zhang

et al. 2017

J Appl Crystallogr

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For the phase of Ti-5553-type metastable -Ti alloys, striations in transmission electron microscopy (TEM) bright-and dark-field images have been frequently observed but their origin has not been sufficiently investigated. In the present work, this phenomenon is studied in depth from the macroscopic scale by neutron diffraction to the atomic scale by high-resolution TEM. The results reveal that the phase contains homogeneously distributed modulated structures, intermediate between that of the phase (cubic) and that of the phase or the ! phase (hexagonal), giving rise to the appearance of additional diffraction spots at 1/2, 1/3 and 2/3 diffraction positions. The intermediate structure between and is formed by the atomic displacements on each second {110} plane in the h110i direction, whereas that between and ! is formed by atomic displacements on each second and third {112} plane in the opposite h111i direction. Because of these atomic displacements, the {110} and {112} planes become faulted, resulting in the streaking of diffraction spots and the formation of extinction fringes in TEM bright-and dark-field images, the commonly observed striations. The present work reveals the origin of the striations and the intrinsic correlation with the additional electron reflections of the phase.

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Novel Mixed-Mode Phase Transition Involving a Composition-Dependent Displacive Component

Cited by 120 publications

References 14 publications

A Review of Metastable Beta Titanium Alloys

A Review of Metastable Beta Titanium Alloys

Correlative Microscopy—Novel Methods and Their Applications to Explore 3D Chemistry and Structure of Nanoscale Lattice Defects: A Case Study in Superalloys

The origin of striation in the metastable β phase of titanium alloys observed by transmission electron microscopy

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