A positron annihilation study of defects in extra high purity Ti with various deformation and annealing treatments

Kwon, Hyuk Il; Kim, In Sup

doi:10.1016/0956-716x(95)90845-b

Cited by 9 publications

(2 citation statements)

References 6 publications

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“…The opposite contribution to elastic modulus of these two nano-scale “components” gives rise to a weak temperature dependence of modulus, i.e., broad and shallow modulus dip. Compared with the solution treated sample, the cold rolled TNTZ-1.2O alloy possesses more point defects, because vacancies and self-interstitials can be generated by cold rolling as proved by positron annihilation studies26. Recent experimental and theoretical studies1727 further reveal that the variation of volume fractions of martensitic nano-domains and parent matrix becomes much more sluggish by introducing more point defects.…”

Section: Discussionmentioning

confidence: 99%

Strain glass transition in a multifunctional β-type Ti alloy

Wang

Gao

et al. 2014

Sci Rep

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Recently, a class of multifunctional Ti alloys called GUM metals attracts tremendous attentions for their superior mechanical behaviors (high strength, high ductility and superelasticity) and novel physical properties (Invar effect, Elinvar effect and low modulus). The Invar and Elinvar effects are known to originate from structural or magnetic transitions, but none of these transitions were found in the GUM metals. This challenges our fundamental understanding of their physical properties. In this study, we show that the typical GUM metal Ti-23Nb-0.7Ta-2Zr-1.2O (at%) alloy undergoes a strain glass transition, where martensitic nano-domains are frozen gradually over a broad temperature range by random point defects. These nano-domains develop strong texture after cold rolling, which causes the lattice elongation in the rolling direction associated with the transition upon cooling and leads to its Invar effect. Moreover, its Elinvar effect and low modulus can also be explained by the nano-domain structure of strain glass.

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Section: Discussionmentioning

confidence: 99%

Strain glass transition in a multifunctional β-type Ti alloy

Wang

Gao

et al. 2014

Sci Rep

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“…In general, plastic deformation in metals produces not only dislocations, but also gives rise to vacancies, interstitials and clusters of point defects, and these defects are affected by the presence of impurities [7]. The purpose of the present work was to investigate the evolution on the microstructure as a function on the percentage of the rolling deformation for pure iron using positron annihilation lifetime (PAL) and coincidence Doppler broadening of the annihilation radiation (CDBAR) techniques.…”

Section: Introductionmentioning

confidence: 99%

Vacancy-type defects in cold-worked iron studied using positron annihilation techniques

Hamed

Kwon

Kim

et al. 2007

Nuclear Instruments and Methods in Physics Research Section B:

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Thermal Stability Study of Vacancy‐Type Defects in Commercial Pure Titanium Using Positron Annihilation Spectroscopy

et al. 2016

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Commercially pure (CP) titanium has been subjected to hydrostatic extrusion at room temperature at true strains ranging from 0.70 to 3.24. Isochronal thermal treatments, from room temperature to 1 200 C, have been performed and the thermal stability of the deformation-induced defects has been studied by positron annihilation spectroscopy (PAS). In non-annealed samples, vacancy-type defects are formed and interact with iron impurities. These defects are not stable near room temperature. Saturation of the positron annihilation parameters is not observed for cumulative true strains as large as 3.24, due to dynamic recovery during the extrusion process. TEM experiments confirm the formation of iron-rich precipitates. Vacancy-type defects and vacancy-impurity complexes anneal out at temperatures %700 C.

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A positron annihilation study of defects in extra high purity Ti with various deformation and annealing treatments

Cited by 9 publications

References 6 publications

Strain glass transition in a multifunctional β-type Ti alloy

Strain glass transition in a multifunctional β-type Ti alloy

Vacancy-type defects in cold-worked iron studied using positron annihilation techniques

Thermal Stability Study of Vacancy‐Type Defects in Commercial Pure Titanium Using Positron Annihilation Spectroscopy

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