Orthorhombic martensite and the ω phase in quenched and deformed titanium alloys with 20–24 at % Nb

D’yakonova, N. B.; Lyasotskii, I. V.; Rodionov, Yu. L.

doi:10.1134/s0036029507010107

Cited by 20 publications

(11 citation statements)

References 7 publications

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“…The lowest solute content in which was detected in this work was 35.9 wt% Nb. Slightly differing values are reported in the literature (Dobromyslov & Elkin, 2001;D'yakonova et al, 2007;Kim et al, 2006). Dobromyslov & Elkin (2001) were able to detect retained in quenched alloys with Nb contents higher than 28.5 wt% (e:a = 4.170).…”

Section: Resultsmentioning

confidence: 76%

“…The limiting concentrations of these intervals were determined from the data points in Fig. 3(b), which shows the refined lattice parameters obtained in this study compared with summarized data taken from the literature (Ahmed & Rack, 1996;Bagariatskii et al, 1958;Baker & Sutton, 1969;Banumathy et al, 2009;Brown et al, 1964;Cremasco et al, 2011;Dobromyslov & Elkin, 2001D'yakonova et al, 2007;Hermann et al, 2012;Jepson et al, 1970;Kim et al, 2006;Moffat & Larbalestier, 1988;Nyayadhish et al, 2008). (A summary of the refined lattice parameters is provided in Table 2.)…”

Section: Resultsmentioning

confidence: 83%

“…The 00 lattice parameters and the value of y in Wyckoff position 4c are highly sensitive to changes in stoichiometry. While the unit-cell dimensions have been measured by various authors at different levels of solute content (Ahmed & Rack, 1996;Bagariatskii et al, 1958;Baker & Sutton, 1969;Banumathy et al, 2009;Brown et al, 1964;Cremasco et al, 2011;Dobromyslov & Elkin, 2006;D'yakonova et al, 2007;Jepson et al, 1970;Kim et al, 2006;Moffat & Larbalestier, 1988;Morniroli & Gantois, 1973;Nyayadhish et al, 2008), only limited experimental data are available in the literature on the composition-dependent atom positions on the (002) 00 plane, described by the parameter y (Banumathy et al, 2009;Brown et al, 1964). These atom positions may have influence in two ways: (i) on the selection of twin planes and habit planes separating the martensitic variants and the parent -martensite volumes, respectively, and (ii) on the mechanical deformation behaviour of 00 .…”

Section: Introductionmentioning

confidence: 99%

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Composition-dependent magnitude of atomic shuffles in Ti–Nb martensites

et al. 2014

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In this work the structural characteristics of martensitic phases in the Ti–Nb system are studied in detail. While the distortion of the orthorhombic unit cell of α′′‐martensite by the addition of β‐stabilizing atoms is well documented in the literature, comprehensive experimental data on the detailed atomic positions and how they vary with chemical composition are missing. For this study, a series of binary Ti–Nb alloys were prepared by casting techniques, followed by homogenization treatment and water quenching. Rietveld‐based analyses of X‐ray diffraction data were used to study the gradual structural changes of α′‐ and α′′‐martensites effected by the addition of Nb, and their compositional boundaries were determined. In the case of orthorhombic α′′, it was established that, besides the lattice parameters, the positions of the atoms on the (002)α′′ planes respond very sensitively to the amount of Nb present.

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Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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Composition-dependent magnitude of atomic shuffles in Ti–Nb martensites

et al. 2014

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“…Q of V I and V II clusters are 0.64° and 0.54° for these lattice parameters, respectively. The thermal expansion coefficients of the parent and martensite phases were on the order of 10 -5 /K [26], so the effect of the thermal expansion was neglected for the temperature range used in this study.…”

Section: Alloymentioning

confidence: 99%

Formation process of the incompatible martensite microstructure in a beta-titanium shape memory alloy

et al. 2017

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The formation modes of habit plane variant (HV) clusters (HVCs) in a Ti-23Nb-3Al (mol%) shape memory alloy were investigated by in situ optical microscopy with high-speed digital video camera. In addition to the kinematic compatibility condition, the nucleation mode and the interfacial energy between martensites were clearly shown to have critical roles. The V I cluster, which is formed by two HVs connected by a {111} type I twin, predominated in the early stage of the martensitic transformation, and had a lower energy barrier to nucleation and growth than did the V II cluster, which is formed by two HVs connected by a <211> type II twin. Eighty percent of the V I clusters were observed to form by paired nucleation or branching, in which the junction plane corresponds to the nucleation site of the relevant HV(s). In contrast, V II clusters formed as a result of collisions of HVs. Neither paired nucleation nor branching was observed for V II. V I nuclei rather than V II nuclei had a strong tendency to form, and this difference was not fully explained by the kinematic compatibility (KC) conditions. The junction planes formed by the collision of growing HVs should have larger deviation from the KC condition. The compatibility of the junction plane between HVs depends on the formation modes.

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“…Even more recently, it has been demonstrated that alloys based on 00 can be developed into Invar-like materials exhibiting zero linear thermal expansion Demakov, Semkina & Stepanov, 2017;D'yakonova et al, 2007;Gehring et al, 2020). Taking advantage of the highly anisotropic thermal expansion of the 00 unit cell (Monroe et al, 2016;Bö nisch et al, 2017), it was shown that the macroscopic linear expansion can be tailored via optimization of the crystallographic texture and phase composition.…”

Section: Introductionmentioning

confidence: 99%

A general model for the crystal structure of orthorhombic martensite in Ti alloys

Демаков

Kylosova

Stepanov

et al. 2021

Acta Crystallogr B Struct Sci Cryst Eng Mater

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The present work develops a novel unified approach to describe the crystal structure of orthorhombic martensite (α′′) in Ti alloys independent of chemical composition. By employing a straightforward yet highly instructive solid sphere model for the basic tetrahedral structural unit the crystal structures involved in the β ↔ α′′/α′ martensitic transformation are categorized into several intermediate configurations. Importantly, a new metric is introduced, δ, which unambiguously characterizes the atomic positions inside the orthorhombic unit cell depending on unit-cell geometry. Furthermore, the exclusive use of relative quantities to describe unit-cell geometry and atom positions renders the approach developed herein independent of alloy content. In this way, shortcomings of commonly suggested structural metrics for α′′ are eliminated. Subsequently, the novel methodology is applied to analyse and compare the crystal structure of α′′ across a broad range of Ti alloys based on experimentally measured unit-cell parameters. From this analysis it emerges that a large fraction of structural configurations along the b.c.c.–Cmcm–h.c.p. transformation path is not observed in quenched alloys. The threshold between the not-observed and the remaining well observed configurations is identified with an ideal Cmcm crystal structure, relative to which the experimentally found α′′ is compressed along its c axis.

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Orthorhombic martensite and the ω phase in quenched and deformed titanium alloys with 20–24 at % Nb

Cited by 20 publications

References 7 publications

Composition-dependent magnitude of atomic shuffles in Ti–Nb martensites

Composition-dependent magnitude of atomic shuffles in Ti–Nb martensites

Formation process of the incompatible martensite microstructure in a beta-titanium shape memory alloy

A general model for the crystal structure of orthorhombic martensite in Ti alloys

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