Yearly Archives: 2024

‘Chemical Origins Of ß-Ti Stabilization Via B4C Additions In Metastable ß-Ti Alloys And Composites | Scientific Reports – Nature.com’

Nature.com Oct 21, 2024

The aerospace industry relies on Ti alloys owing to their strength-to-weight ratio and corrosion resistance. In metastable 946-Ti alloys slow cooling from the 946-transus leads to partial transformation into coarse 945 laths which is detrimental to the mechanical properties. A refinement and decrease of 945 laths has been previously achieved in 946-Ti alloys with B4C additions. In these materials the ductility of 946-Ti is preserved and the TiB and TiC particles promote strengthening. However the mechanism of the 946-Ti stabilization remains unclear. Using atom probe tomography we propose that Mo enrichment in the 945-phase limits its growth by reducing the influx of Al from the 946-phase. The complex chemical environment near eutectic TiB is enriched in Al and TiO promoting heterogeneous nucleation of fine 945-phase. Increased TiO concentration is observed with the introduction of B4C. A fundamental understanding of the 945-refinement mechanism in Ti-alloys is critical for aerospace applications demanding high performance and reliability.

‘Axial Compressive Properties Of Round Bamboo-fiber Reinforced Phosphogypsum Composite Short Columns – Nature.com’

Nature.com Oct 22, 2024

Bamboo is an ideal green building material with excellent mechanical properties. Phosphogypsum PG is a kind of solid waste residue which is in urgent need of resource utilization and has been used as construction material. In this paper a kind of round bamboo-fiber reinforced phosphogypsum composite short column was proposed. Axial compression tests of pure bamboo columns bamboo columns filled with phosphogypsum inside bamboo columns with phosphogypsum outside and bamboo columns with phosphogypsum inside and outside were carried out to explore the failure mode and mechanical properties of the short columns. The effects of the parameters include bamboo node hose hoops size of the bamboo tube and the strength of phosphogypsum on the mechanical properties of the short columns were analyzed and the theoretical calculation method of the bearing capacity of the short columns was put forward. The results show that the bamboo nodes and hose hoops can improve the bearing capacity initial stiffness and ductility of the column. The larger the size of the bamboo tube the better the mechanical properties of the short column. The bearing capacity of round bamboo8212phosphogypsum composite short column is higher than that of pure bamboo column. The ductility of bamboo columns with phosphogypsum outside is obviously higher than that of pure bamboo columns. The finite element analysis results are in good agreement with the test results. The theoretical calculation method of the bearing capacity of columns considering the strength reduction coefficient the bamboo node effect coefficient and the constraint effect in this paper has high accuracy.

‘MXene Composite Materials For Anti-icing In Simulated Outdoor Environment – Nature.com’

Nature.com Oct 19, 2024

To improve anti-icing traits of outdoor coatings a synergy between photothermal and hydrophobic anti-icings was utilized to fabricate copolymerTi3C2Tx MXene composite coatings with good transparency and adhesion. MXene contributes to photothermal trait from local surface plasmon resonance effect. Copolymer enables hydrophobicity from perfluoroalkyls-induced low surface energy and high surface roughness. An increase in MXene dose results in an increased surface roughness. With 140.0820117782012.2176 of water contact angle and 70 of light transmittance the optimal film bears 2 wt of MXene. High MXene dose results in large temperature-increase of film under sunlight. After 15ampnbspmin of sunlight exposure the temperature of optimal film surface in icing simulation increases from 8722820118 8451 to 7.2 8451. After 48ampnbsph of acid immersion the temperature-increase of optimal film surface based on 300ampnbsps of sunlight irradiation reaches 28.7820117782011.2 8451. After 48ampnbsph of ultraviolet irradiation the temperature-increase of optimal film surface is 30.7820117782010.8 8451. This surface has a water contact angle of 132.7820117782011.1176 after 48ampnbsph of acid immersion. This study gives impetus to a preparation of various composite coatings for outdoor anti-icingdeicing.

‘Axial Compressive Properties Of Round Bamboo-fiber Reinforced Phosphogypsum Composite Short Columns – Nature.com’

Nature.com Oct 22, 2024

Bamboo is an ideal green building material with excellent mechanical properties. Phosphogypsum PG is a kind of solid waste residue which is in urgent need of resource utilization and has been used as construction material. In this paper a kind of round bamboo-fiber reinforced phosphogypsum composite short column was proposed. Axial compression tests of pure bamboo columns bamboo columns filled with phosphogypsum inside bamboo columns with phosphogypsum outside and bamboo columns with phosphogypsum inside and outside were carried out to explore the failure mode and mechanical properties of the short columns. The effects of the parameters include bamboo node hose hoops size of the bamboo tube and the strength of phosphogypsum on the mechanical properties of the short columns were analyzed and the theoretical calculation method of the bearing capacity of the short columns was put forward. The results show that the bamboo nodes and hose hoops can improve the bearing capacity initial stiffness and ductility of the column. The larger the size of the bamboo tube the better the mechanical properties of the short column. The bearing capacity of round bamboo8212phosphogypsum composite short column is higher than that of pure bamboo column. The ductility of bamboo columns with phosphogypsum outside is obviously higher than that of pure bamboo columns. The finite element analysis results are in good agreement with the test results. The theoretical calculation method of the bearing capacity of columns considering the strength reduction coefficient the bamboo node effect coefficient and the constraint effect in this paper has high accuracy.