Volume 20, Issue 4 (December 2023)
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- In the present work, the development models of a new artificial human soft heart and artificial heart valves were designed, manufactured, and tested using nanocomposite materials and synthetics.
- The fabricated soft heart and the mechanical artificial heart valves were examined to determine the best service life for each type by using the transient repeated and continuously applied blood pressure to simulate diastolic and systolic that occur in the natural heart at each pulse cycle.
- The produced 3D printing of a new generation soft artificial heart for a permanent replacement was implemented as an alternative to the high-cost available temporary implant mechanical hearts, which may exceed the price by tens and hundreds of thousands of dollars, with a working life of not more than five years.
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- By considering the dependency of α΄-martensite content on the strain, the JMAK-type model can be constructed
- JMAK-type model is a useful tool for predicting the nucleation sites and characterizing the transformation kinetics
JMAK-type analysis for the UFG sample resulted in an n value of ~1, but for coarse-grained samples, the value of ~1.6 was
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- KCl-LiCl eutectic composition molten salt accelerates Ti powders to Ti ionic species.
- Ti ions act a crucial role more than Ti in TiC synthesis.
- A duplex mechanism was proposed for TiC synthesis.
- In the primary mechanism Ti powders convert to Ti(II) and then reacts with carbon.
- In the secondary mechanism a reaction happens between Ti-chlorides and carbon to synthesize TiC.
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- The natural aging at room temperature after 8 passes of ECAP showed that the microstructure is not stable during isothermal storage. In the other words, the microstructure is quasi-stable at room temperature after ECAP process.
- It is necessary to mention that grain growth during storage at room temperature was limited due to the two-phase structure of the alloy that prevents each other from excessive growing.
- In the short time of artificial aging after 8 passes of ECAP, the grain growth rate is higher than in the long time of artificial aging.
- After 128 h of aging at 250 °C, the main texture of α phase was Copper {1 1 2} <1 1 1>. On the other hand, the components of P and Y were the main texture of η phase.
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