Microstructure-strength relationship of ultrafine-grained titanium manufactured by unconventional severe plastic deformation process

Wojtas, Daniel; Wierzbanowski, K.; Chulist, R.; Pachla, W.; Bieda, M.; Jarzębska, Anna; Maj, Łukasz; Kawałko, Jakub; Marciszko-Wiąckowska, Marianna; Wroński, M.; Sztwiertnia, K.

doi:10.1016/j.jallcom.2020.155576

Cited by 36 publications

(16 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…First, they were hot extruded (at 250°C) to rods of 30 mm in a diameter (extrusion ratio R = 5.8). Subsequently, the materials were subjected to a main plastic deformation in the form of multi-pass hydrostatic extrusion performed in four consecutive steps at room temperature with a cumulative true strain (e) [23] equal to 3.6 and the final diameter of the extruded rods being 5 mm. The materials were extruded with pressures in the range of 225 to 295 and 430 to 505 MPa for pure Zn and the Zn-1Mg alloy, respectively.…”

Section: Methodsmentioning

confidence: 99%

Controlled Grain Refinement of Biodegradable Zn-Mg Alloy: The Effect of Magnesium Alloying and Multi-Pass Hydrostatic Extrusion Preceded by Hot Extrusion

Jarzębska

Bieda

Maj

et al. 2020

Metall Mater Trans A

Self Cite

View full text Add to dashboard Cite

To satisfy the most stringent criteria in terms of new cardiovascular stents, pure Zn was alloyed with 1 wt pct of Mg and subsequently subjected to plastic deformation, using conventional hot extrusion followed by multi-pass hydrostatic extrusion. A detailed microstructural and textural characterization of the obtained materials was conducted, and mechanical properties were assessed at each pass of deformation process. In contrast to pure Zn, hydrostatically extruded low-alloyed Zn is characterized by a remarkable increase in strength and ductility (YS = 383 MPa, E = 23 pct), exceeding the values needed for stents. Such behavior is associated with a dual microstructure containing fine-grained Zn, alternatively arranged with bands of a fragmented eutectic. Extensive grain refinement was achieved due to the process of continuous dynamic recrystallization. Hydrostatic extrusion changes the initial $$ \langle 10\bar{1}0\rangle $$ ⟨ 10 1 ¯ 0 ⟩ fiber texture to a 〈0002〉 and $$ \langle 10\bar{1}1\rangle $$ ⟨ 10 1 ¯ 1 ⟩ double fiber texture in which the 〈0002〉 component decreases with each pass of hydrostatic extrusion. The gradual evolution of texture components was simulated using a visco-plastic self-consistent model, which confirmed that, during hydrostatic extrusion, secondary slip systems were activated involving mostly the pyramidal one.

show abstract

Section: Methodsmentioning

confidence: 99%

Controlled Grain Refinement of Biodegradable Zn-Mg Alloy: The Effect of Magnesium Alloying and Multi-Pass Hydrostatic Extrusion Preceded by Hot Extrusion

Jarzębska

Bieda

Maj

et al. 2020

Metall Mater Trans A

Self Cite

View full text Add to dashboard Cite

show abstract

“…Large grains contain high-density dislocations and a pronounced fraction of subgrains. Moreover, boundaries between single grains are locally hard to distinguish, which indicates a substantial fraction of low-angle grain boundaries, typically consisting of dislocation arrays, in the volume of a material …”

Section: Resultsmentioning

confidence: 99%

“…The technique, whose principles could be found elsewhere, was utilized for the sake of improvement in the mechanical properties of unalloyed titanium. HE has been perfected to such a degree that it enables the manufacture of pure titanium-based materials outperforming the Ti–6Al–4V alloy in terms of strength. , Prior to the actual deformation, the samples were machined, then annealed at 700 °C for 2 h, so the material became homogenized and softened. The billet, having 25 mm of a diameter in its initial condition, was processed to the final rod with a diameter of 7.41 mm.…”

Section: Methodsmentioning

confidence: 99%

Texture-Governed Cell Response to Severely Deformed Titanium

Wojtas

Mzyk

Kawałko

et al. 2020

ACS Biomater. Sci. Eng.

Self Cite

View full text Add to dashboard Cite

The phenomenon of superior biological behavior observed in titanium processed by an unconventional severe plastic deformation method, that is, hydrostatic extrusion, has been described within the present study. In doing so, specimens varying significantly in the crystallographic orientation of grains, yet exhibiting comparable grain refinement, were meticulously investigated. The aim was to find the clear origin of enhanced biocompatibility of titanium-based materials, having microstructures scaled down to the submicron range. Texture, microstructure, and surface characteristics, that is, wettability, roughness, and chemical composition, were examined as well as protein adsorption tests and cell response studies were carried out. It has been concluded that, irrespective of surface properties and mean grain size, the (101̅ 0) crystallographic plane favors endothelial cell attachment on the surface of the severely deformed titanium. Interestingly, an enhanced albumin, fibronectin, and serum adsorption as well as clearly directional growth of the cells with preferentially oriented cell nuclei have been observed on the surfaces having (0001) planes exposed predominantly. Overall, the biological response of titanium fabricated by severe plastic deformation techniques is derived from the synergistic effect of surface irregularities, being the effect of refined microstructures, surface chemistry, and crystallographic orientation of grains rather than grain refinement itself.

show abstract

“…A large number of LAGBs can improve the strength of the material, but the possibility of crack formation will increase, resulting in a decrease in plasticity and toughness. [33] In addition, carbides are difficult to precipitate at LAGBs, and the increase of LAGBs generated during the solidification process will significantly improve the corrosion resistance of the material. [29,34] The KAM results of SLMed GAS are shown in Figure 8.…”

Section: Microstructure Evolutionmentioning

confidence: 99%

Novel Gradient Alloy Steel with Quasi‐Continuous Ratios Fabricated by Selective Laser Melting: Microstructure and Corrosion Behavior

Zhang

Zhou

et al. 2021

steel research int.

View full text Add to dashboard Cite

In this article, a quasi‐continuous ratio gradient alloy steel (GAS) with a 24CrNiMo high‐strength low‐alloy steel matrix for high‐speed railway brake discs is fabricated by selective laser melting (SLM). The composition of GAS is X% 24CrNiMo + (1–X)% wear‐resistant stainless steel (WSS), in which X is 100, 65, 35, and 0. The relationship between the microstructure and the corrosion resistance is intensively studied by electron backscatter diffraction (EBSD) and potentiodynamic electrochemical equipment. With the increase in the content of WSS, the low angle grain boundaries of the GAS increases, and the microstructure refines and the texture intensity decreases. The passivation film of the external WSS strengthening layer is dense; the corresponding corrosion potential and corrosion current density are −0.109 V and 2.08 × 10−8 A cm−2, respectively. The corrosion current density is about 1% of the substrate 24CrNiMo, and the corrosion resistance of the material is significantly improved.

show abstract

Microstructure-strength relationship of ultrafine-grained titanium manufactured by unconventional severe plastic deformation process

Cited by 36 publications

References 53 publications

Controlled Grain Refinement of Biodegradable Zn-Mg Alloy: The Effect of Magnesium Alloying and Multi-Pass Hydrostatic Extrusion Preceded by Hot Extrusion

Controlled Grain Refinement of Biodegradable Zn-Mg Alloy: The Effect of Magnesium Alloying and Multi-Pass Hydrostatic Extrusion Preceded by Hot Extrusion

Texture-Governed Cell Response to Severely Deformed Titanium

Novel Gradient Alloy Steel with Quasi‐Continuous Ratios Fabricated by Selective Laser Melting: Microstructure and Corrosion Behavior

Contact Info

Product

Resources

About