New approach to ${\upalpha }$-titanium mechanical properties enhancement by means of thermoplastic deformation in mid-temperature range

IF 1.9 4区工程技术 Q3 MECHANICS

Continuum Mechanics and Thermodynamics Pub Date : 2024-08-05 DOI:10.1007/s00161-024-01321-4

Jakub Bańczerowski, Marek Pawlikowski, Tomasz Płociński, Andrzej Zagórski, Sylwester Sawicki, Roman Gieleta

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Abstract

Pure titanium due to its high corrosion resistance, low stiffness and good mechanical properties is commonly used in medicine for orthopaedic applications. However, its material properties (especially in the case of ${\upalpha }$-titanium) require a further enhancement to fulfil its role. The thermoplastic deformation in mid-temperature is proposed as a method for microstructure improvement. Titanium samples were compressed in different temperatures and strain rates to determine the best conditions for grain fragmentation—the main factor responsible for strength and hardness increase. The thermoplastic stress–strain curves were registered. Then microstructure observations and electron backscatter analysis were performed on the chosen samples. Finally, mechanical response of the previously deformed material was obtained in room temperature compression tests. A significant grain fragmentation was recorded for the material deformed in 400 $^{\circ }\hbox {C}$, at 0.1/s and 1/s strain rates. Desirable results were also noticed for the deformation performed at 500–600 $^{\circ }\hbox {C}$. However, high temperatures (700–800 $^{\circ }\hbox {C}$) and strain rates (10/s) resulted in dynamic recrystallization, causing undesirable grain growth. An increase in hardness was observed in all cases, with higher values recorded in lower deformation temperatures. Room temperature compression tests revealed slight increase of ductility.

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在中温范围内通过热塑性变形提高 $${upalpha }$$ - 钛机械性能的新方法

纯钛具有高耐腐蚀性、低刚度和良好的机械性能，通常用于医学矫形。然而，其材料性能（尤其是在（{\upalpha }\ ）-钛的情况下）需要进一步提高才能发挥作用。中温热塑性变形是一种改善微观结构的方法。在不同温度和应变率下对钛样品进行压缩，以确定晶粒破碎的最佳条件--晶粒破碎是提高强度和硬度的主要因素。对热塑性应力-应变曲线进行了记录。然后对所选样品进行微观结构观察和电子反向散射分析。最后，在室温压缩试验中获得了先前变形材料的机械响应。在 400 $^{\circ }\hbox {C}$、0.1/s和1/s应变速率下变形的材料出现了明显的晶粒破碎。在 500-600 （^{\circ }\hbox {C}\）条件下进行的变形也得到了理想的结果。然而，高温（700-800 \(^{\circ }\hbox {C}/\）和应变率（10/s）导致了动态再结晶，造成了不良的晶粒生长。在所有情况下都观察到了硬度的增加，变形温度越低，硬度值越高。室温压缩试验显示延展性略有增加。

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来源期刊

Continuum Mechanics and Thermodynamics 物理-力学

CiteScore

5.30

自引率

15.40%

发文量

审稿时长

>12 weeks

期刊介绍： This interdisciplinary journal provides a forum for presenting new ideas in continuum and quasi-continuum modeling of systems with a large number of degrees of freedom and sufficient complexity to require thermodynamic closure. Major emphasis is placed on papers attempting to bridge the gap between discrete and continuum approaches as well as micro- and macro-scales, by means of homogenization, statistical averaging and other mathematical tools aimed at the judicial elimination of small time and length scales. The journal is particularly interested in contributions focusing on a simultaneous description of complex systems at several disparate scales. Papers presenting and explaining new experimental findings are highly encouraged. The journal welcomes numerical studies aimed at understanding the physical nature of the phenomena. Potential subjects range from boiling and turbulence to plasticity and earthquakes. Studies of fluids and solids with nonlinear and non-local interactions, multiple fields and multi-scale responses, nontrivial dissipative properties and complex dynamics are expected to have a strong presence in the pages of the journal. An incomplete list of featured topics includes: active solids and liquids, nano-scale effects and molecular structure of materials, singularities in fluid and solid mechanics, polymers, elastomers and liquid crystals, rheology, cavitation and fracture, hysteresis and friction, mechanics of solid and liquid phase transformations, composite, porous and granular media, scaling in statics and dynamics, large scale processes and geomechanics, stochastic aspects of mechanics. The journal would also like to attract papers addressing the very foundations of thermodynamics and kinetics of continuum processes. Of special interest are contributions to the emerging areas of biophysics and biomechanics of cells, bones and tissues leading to new continuum and thermodynamical models.

New approach to \({\upalpha }\)-titanium mechanical properties enhancement by means of thermoplastic deformation in mid-temperature range

Abstract