High Tensile Ductility and Strength in Dual-phase Bimodal Steel through Stationary Friction Stir Processing

Arora, Harpreet Singh; Ayyagari, Aditya; Saini, Jaskaran Singh; Selvam, Karthikeyan; Riyadh, S.; Pole, Mayur; Grewal, Harpreet Singh; Mukherjee, Sundeep

doi:10.1038/s41598-019-38707-3

Cited by 44 publications

(18 citation statements)

References 32 publications

(23 reference statements)

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“…The schematic representation of the SFP process is shown in Figure . It is an adaptation of a well-known FSP technique wherein the tool is rotated at a localized position of the workpiece instead of having a transverse motion. , The snapshot of the actual SFP on the HEA specimen is also shown in the figure. SFP resulted in the evolution of a significantly different microstructure in MoNbTaTiZr HEA compared to FSP as discussed below.…”

Section: Results and Discussionmentioning

confidence: 99%

Enhanced Biocorrosion Resistance and Cellular Response of a Dual-Phase High Entropy Alloy through Reduced Elemental Heterogeneity

Perumal

Grewal

Pole

et al. 2020

ACS Appl. Bio Mater.

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The leaching out of toxic elements from metallic bioimplants has serious repercussions, including allergies, peripheral neuritis, cancer, and Alzheimer’s disease, leading to revision or replacement surgeries. The development of advanced structural materials with excellent biocompatibility and superior corrosion resistance in the physiological environment holds great significance. High entropy alloys (HEAs) with a huge compositional design space and outstanding mechanical and functional properties can be promising for bioimplant applications. However, microstructural heterogeneity arising from elemental segregation in these multiprinciple alloy systems is the Achilles heel in the development of next-generation HEAs. Here, we demonstrate a pathway to homogenize the microstructure of a biocompatible dual-phase HEA, comprising refractory elements, namely, MoNbTaTiZr, through severe surface deformation using stationary friction processing (SFP). The strain and temperature field during processing homogenized the elemental distribution, which was otherwise unresponsive to conventional annealing treatments. Nearly 15 min of the SFP treatment resulted in a significant elemental homogenization across dendritic and interdendritic regions, similar to a week-long annealing treatment at 1275 K. The SFP processed alloy showed a nearly six times higher biocorrosion resistance compared to its as-cast counterpart. X-ray photoelectron spectroscopy was used to investigate the nature of the oxide layer formed on the specimens. Superior corrosion behavior of the processed alloy was attributed to the formation of a stable passive layer with zirconium oxide as the primary constituent and higher hydrophobicity. Biocompatibility studies performed using the human mesenchymal stem cell line, showed higher viability for the processed HEA compared to its as-cast counterpart as well as conventional metallic biomaterials including stainless steel (SS316L) and titanium alloy (Ti6Al4V).

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Section: Results and Discussionmentioning

confidence: 99%

Enhanced Biocorrosion Resistance and Cellular Response of a Dual-Phase High Entropy Alloy through Reduced Elemental Heterogeneity

Perumal

Grewal

Pole

et al. 2020

ACS Appl. Bio Mater.

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“…The friction stir processing (FSP) is nowadays widely studied for modifying the surface properties of the alloys/coatings through high strain deformation. [ 49,50 ] Interestingly, the reinforced CCA claddings showed lower erosion rates compared with FSP‐treated SS316L and TS techniques at both impact angles (Figure 8). Among all, the bimodal composite cladding showed the highest erosion resistance which is around 7–11 times compared with TS coatings.…”

Section: Resultsmentioning

confidence: 99%

Slurry Erosion–Corrosion of Bimodal Complex Concentrated Alloy Composite Cladding

2020

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Herein, bimodal-reinforced AlCoCrFeNi complex concentrated alloy composite cladding on stainless steel 316L substrate using microwave hybrid processing is synthesized. Detailed microstructural analysis of the claddings shows the presence of cellular structure A2 (disordered BCC) with intermetallics (B2 (ordered BCC) and σ phases) at the intercellular regions. The presence of Cr 23 C 6 is also observed for the reinforced claddings due to the dissociation of the SiC particles. The bimodal-reinforced cladding shows the highest hardness (in excess of 800 HV) and fracture toughness (%12 MPa p m), followed by microand nanocomposite claddings. Under slurry erosion condition, the bimodal composite cladding exhibits 10 times better erosion resistance than stainless steel 316L and nonreinforced cladding (1.5-2 times), respectively, at oblique angle followed by nano-and microreinforced unimodal counterparts. The outstanding performance of the bimodal composite cladding under both test conditions is related to higher hardness, fracture toughness, and resistance to plastic deformation. The detailed analysis of the eroded samples shows microcutting and ploughing as a dominant mechanism at an oblique angle while platelets, cracks, and microindents being the contributing factors for erosion at the normal impact angle.

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“…On the other hand, Al 2 O 3 nano particles can act as barriers to dislocation movement, which results in higher strength. In addition, it is well documented that the formation of bimodal structures causes synergic increase in strength and elongation [19]. Moreover, the existence of UFG structure leads to increase in strength according to the grain boundary strengthening mechanism ( Δ GR ) or Hall-Petch equation.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Microstructure and mechanical properties of CuZn-Al2O3 nanocomposites produced by friction stir processing

Heidarzadeh

Taghizadeh

Mohammadzadeh

2020

Archiv.Civ.Mech.Eng

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For the first time, ceramic nano particles were incorporated into the brass alloy to produce surface nano composites by friction stir processing. For this aim, Al 2 O 3 particles with an average diameter of 30 nm were inserted into a Cu-37Zn alloy at different tool rotational speeds of 450, 710, and 1120 rpm, multi passes, and a constant traverse speed of 100 mm/min. The microstructures of the processed materials were analyzed using optical and scanning electron microscopes equipped with an energy dispersive spectroscopy. In addition, tensile test was employed to evaluate the mechanical properties. The results showed that the optimum rotational speed was 710 rpm. At lower rotational speeds, Al 2 O 3 particles were agglomerated. On the other hand, at higher rotational speeds, tool was damaged by severe wear. The effect of multi passes showed that one and two passes could not distribute the Al 2 O 3 particles, uniformly. However, three passes resulted in a uniform distribution of the Al 2 O 3 particles inside a bimodal grain structure composed of both 3-5 μm grains and ultra-fine grains (< 1 μm). By using multi-pass friction stir processing, a synergic increase in ultimate tensile strength and elongation was obtained. Moreover, three passes caused superior mechanical properties i.e. ultimate tensile strength of 430 MPa and elongation of 39%. The fracture behavior and strengthening mechanisms are also discussed in details.

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High Tensile Ductility and Strength in Dual-phase Bimodal Steel through Stationary Friction Stir Processing

Cited by 44 publications

References 32 publications

Enhanced Biocorrosion Resistance and Cellular Response of a Dual-Phase High Entropy Alloy through Reduced Elemental Heterogeneity

Enhanced Biocorrosion Resistance and Cellular Response of a Dual-Phase High Entropy Alloy through Reduced Elemental Heterogeneity

Slurry Erosion–Corrosion of Bimodal Complex Concentrated Alloy Composite Cladding

Microstructure and mechanical properties of CuZn-Al2O3 nanocomposites produced by friction stir processing

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