The widely used Ti–6Al–4V (TC4) titanium alloy has been modified through the micro-alloying of Fe. microstructural features and mechanical properties designed alloy, TC4F, are compared with other alloys in class by combining experimental characterizations thermodynamic calculations. TC4F not only maintains strength, hardness, elongation similar to baseline TC4 but also exhibits improved fracture toughness comparable TC4_ELI even superior TC4_DT under heat-treated condition. It opens up a new...

The thermal expansion behavior, microstructure evolution and β → ωiso phase transformation kinetics of the low cost Ti–3Al–5Mo–4Cr–2Zr–1Fe (Ti-35421, wt.%) titanium alloy during continuous heating have been investigated by using dilatometric (DIL) method. results revealed that corresponding sequence can be verified as ωiso, + α β, TEM SEM analysis process. local composition distribution was detected STEM mapping. transition curve exhibited a typical S-type pattern, indicating controlled...

This paper addresses the minimum transmission broadcast problem in wireless networks and presents efficient solutions, including an optimal scheme a distributed game-based algorithm. Distinct from related work literature which typically assumes links are reliable, we address issue of broadcasting over both reliable unreliable links. Our main contributions as follows: We first formulate problems two mixed integer linear programming (MILP) problems, respectively. way, schemes can be easily...

A three-axis fast tool servo (FTS) with a symmetric structure design to reduce the parasitic motion for realizing high tracking accuracy while maintaining performances in stiffness and open-loop bandwidth is developed ultraprecision diamond cutting. Modeling, analysis, optimization of by finite-element method six degree-of-freedom are conducted designing mechanism. Experiments carried out test FTS, which show low motion, accuracy, dynamic response. With error close-loop control each axis,...

A novel free radical reaction combined with high-performance LC–photodiode array–ESI–MS/MS screening method was developed for the detection and identification of natural antioxidants from whole Scutellariae. Six compounds Scutellariae extracts were found to possess a potential antioxidant capacity, their radical-scavenging activities investigated in detail. The six identified as baicalin, baicalein, scutellarin, scutellarein, wogonoside chrystin-7-glucoronide. present study reveals that...

The microstructure and mechanical properties of a newly developed Fe-microalloyed Ti–6Al–4V titanium alloy were investigated after different heat treatments. volume fraction the morphological features lamellar α phase had significant effects on alloy’s performance. A dataset showing relationship between microstructural tensile strength, elongation, fracture toughness was developed. high aging temperature resulted in plasticity toughness, but relatively low strength. strength favored fine...

The work explores the phase transformation sequence and kinetics of ω formation in a novel metastable β titanium alloy Ti–3Al–5Mo–7V–3Cr (wt%) through dilatometer test phase/microstructure characterizations. has been identified as → + ω, α β, α, during continuous heating. underwent nucleation growth stages revealed by S-shaped kinetic curve. diffusion controlled mechanism analyzed via Avrami exponent. average activation energy for evaluated 90.42 kJ/mol Kissinger–Akahira–Sunose equation....

A novel screening method was developed for the detection and identification of radical scavenging natural antioxidants based on a free reaction combined with liquid chromatography tandem mass spectrometry. Functionalized graphene quantum dots were prepared loading radicals in complex system. The performed without preliminary exposure samples to specific functionalized dots, which can facilitate charge transfer between antioxidants. difference chromatographic peak areas used identify...

The phase transformation during continuous heating of Ti6Al4V-0.55Fe alloy with various initial microstructure including equiaxed, duplex and lamellar microstructures was investigated by thermal expansion test. results illuminate that the β→α transition curves three samples all present sigmoidal "S" shape, which proves this process is controlled nucleation growth. activation energies Avrami indexes were obtained Kissinger-Achaia-Sunose (KAS) method Kolmogorov-Johnson-Mehl-Avrami (KJMA)...

In this work, the evolution of solidification microstructures Ti–6Al–4V–xFe (x = 0.1, 0.3, 0.5, 0.7, 0.9) alloys fabricated by levitation melting was studied combined simulative and experimental methods. The growth grains as well composition distribution mechanisms during process alloy are discussed. segregation Fe element at grain boundaries promotes formation a local supercooling zone, thus inhibiting mobility solid–liquid interface making it easier for to grow into dendrites. With...

A novel divide-by-4 injection-locked frequency divider (ILFD)is proposed and was implemented in the TSMC 0.18 μm 1P6M CMOS process. Conventional harmonic mixer ILFD has limited locking range, this letter shows a wide range LC designed with one linear divide-by-2 stacked on top of other ILFD. At drain-source bias 1.6V at incident power 0 dBm, is 5.7 GHz (42.8%)from 11.4 to 17.1GHz consumption 9.93mW. The free-running oscillation 2.6GHz. die area 0.644 ×0.908mm <sup...

A sophisticated understanding of phase transformations and microstructure evolution is crucial in mechanical property optimization for the newly developed low-cost Ti-35421 (Ti-3Al-5Mo-4Cr-2Zr-1Fe wt.%) titanium alloy. The dual-phase were studied by experiments thermo-kinetic modeling. transformation reactions temperature ranges determined as β→αlamellar [410–660 °C], αlamellar→β [660–740 αlath→β [740–825 °C]. Gibbs-Thomson effect multicomponent diffusivities proven to be responsible...