Температурна Та Швидкісна Чутливість Механічних Властивостей В Перспективних Сплавах TNM

Подрезов, Ю М; Remez, М. V.; Холявко, В В; Прокопчук, М Д

doi:10.31435/rsglobal_ws/30112019/6763

2019

DOI: 10.31435/rsglobal_ws/30112019/6763

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Температурна Та Швидкісна Чутливість Механічних Властивостей В Перспективних Сплавах TNM

Ю М Подрезов¹,

М. V. Remez²,

В В Холявко³

et al.

Abstract: The temperature and velocity sensitivity of the mechanical properties of TiAl-based alloys were investigated. The structure was determined by scanning electron microscopy in SEI mode. Mechanical properties were determined by the results of tensile and bending tests. It was found that the temperature and velocity dependence of the mechanical properties in alloys with 47% Al is practically absent. This makes them promising for use as structural materials, due to the stability of their proper… Show more

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Brittle-ductile transition of titanium aluminides, alloyed by β-phase stabilization elements

Remez¹,

Podrezov²,

Danylenko³

et al. 2020

Usp. materiаlozn

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The temperature, structural, and rate sensitivity of the plasticity characteristics in γ-tita¬nium aluminides with different Al contents, doped with β-phase stabilization elements, are studied. Particular attention is paid to dislocation mechanisms that control the brittle-plastic transition. The main role of grain boundaries in the formation of plasticity characteristics is demonstrated. At low temperatures, the grain boundaries stop propagation of brittle transgranular cracks and confine the development of the plastic zone beyond the boundaries of an individual grain, creating the prerequisites for fracture in the microdeformation level. At elevated temperatures, the boundaries contribute to the formation of dislocations pile-up in the plastic zone with a stress concentration required to set off the Frank-Reed sources and the displacement of the plastic zone beyond the boundaries of an individual grain, changing its configuration and stress distribution and inhibiting the propagation of cracks. Acceleration of rela¬xation processes in the vicinity of the crack’s tip creates the prerequisites for the development of macrodeformation. Local relaxation processes at the crack’s tip contribute to high speed sensitivity of the plasticity characteristics. This effect has important practical consequences, since there is a temperature region near the upper working temperature of γ-TiAl alloys, where the stress value remains high (yield strength σ02 ~700 MPa and ultimate stress σul ~ 1200 MPa at bending tests) regardless of the strain rate, while deformation sharply increases at low speeds. As a result, it is possible to achieve a combination of high strength and ductility during creep tests. In samples tested by tension with low speed (10-5 s-1) the neck formation take a place. Deformation occurs by the dislocation-twinning mechanisms. At small deformations (7%) a twinning mechanism is preferable. Concentration of dislocations sharply increases at large deformations (32%) with formation of dislocation clusters. Stress relaxation on the boundary between γ-phase twins and α2-lamella, occurs by macroscopic shift on α2-lamella. Keywords: γ-titanium-aluminides, structure, strength, plasticity, brittle-ductile transition, temperature and rate sensitivity.

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Brittle-ductile transition of titanium aluminides, alloyed by β-phase stabilization elements

Remez¹,

Podrezov²,

Danylenko³

et al. 2020

Usp. materiаlozn

View full text Add to dashboard Cite

show abstract

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Температурна Та Швидкісна Чутливість Механічних Властивостей В Перспективних Сплавах TNM

Cited by 1 publication

References 5 publications

Brittle-ductile transition of titanium aluminides, alloyed by β-phase stabilization elements

Brittle-ductile transition of titanium aluminides, alloyed by β-phase stabilization elements

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