Superior Cryogenic Tensile Strength and Ductility of In Situ Al–Cu Matrix Composite Reinforced with 0.3 wt% Nano‐Sized TiCp

Geng, Run; Tian, Wei–Si; Zhao, Qinglong; Qiu, Feng; Jiang, Qi‐Chuan

doi:10.1002/adem.201701137

Cited by 14 publications

(13 citation statements)

References 23 publications

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“…This phenomenon is very rare for general materials, which would experience a reduction in tensile properties as the temperature increases due to the lower lattice friction for crystals or higher chain mobility for polymers. [38,39] For practical application, the mechanical performance of a phase change film is crucial. The flexible and robust features of OANF-PNIPAM films guarantee that they can work properly under mechanical deformations or external forces.…”

Section: Resultsmentioning

confidence: 99%

Nanoporous Kevlar Aerogel Confined Phase Change Fluids Enable Super‐Flexible Thermal Diodes

Lyu

Sheng

et al. 2022

Adv Funct Materials

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Aerogels have demonstrated tremendous potentials for various applications, including thermal insulation, environmental protection, and separation. However, aerogels as porous frameworks to host functional liquids (such as phase change fluids, PCFs) is a more promising application, attributing to their large specific surface area, high porosity, and strong capillary force. Herein, the original aramid nanofiber (OANF, i.e., Kevlar) aerogel film and the densified ANF (DANF) aerogel film are fabricated and thereafter applied to confine phase change fluids, poly (N‐isopropylacrylamide) (PNIPAM) solution and molten eicosane (C20), respectively, to make super‐flexible OANF‐PNIPAM and DANF‐C20 films accordingly. These two films exhibit reversely temperature‐dependent thermal conductivity with close phase change temperature to each other. Therefore, flexible thermal diodes operating with terminals of OANF‐PNIPAM film and DANF‐C20 film are proposed and fabricated, showing excellent flexibility (420 µm in curvature radius) and robustness (≥7.2 MPa in tensile strength) as well as the maximum thermal rectification ratio of 2.0. This work paves a way for expanding the applications of Kevlar aerogel confined phase change fluids, as well as provides a promising strategy for designing more practical thermal diodes and thermal devices.

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Section: Resultsmentioning

confidence: 99%

Nanoporous Kevlar Aerogel Confined Phase Change Fluids Enable Super‐Flexible Thermal Diodes

Lyu

Sheng

et al. 2022

Adv Funct Materials

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“…The low-temperature yield strength and elongation of the alloy in this study are compared with other FCC structural alloys, as shown in Figure 9A. Clearly, the present HEA has better low-temperature mechanical properties than those of other alloys, for example, Al alloys [30] , high Mn steels [31] , Ni-based steels [32,33] , transformation-induced plasticity steels [34] and other HEAs [4,[23][24][25][35][36][37][38][39][40][41][42][43] . It is particularly obvious that the yield strength and UTS are the highest, with values of 1080 and 1150 MPa, annealed at 600 °C, respectively, with a loss of ductility.…”

Section: Mechanical Properties Of Heamentioning

confidence: 88%

High strength and ductility in partially recrystallized Fe40Mn20Cr20Ni20 high-entropy alloys at cryogenic temperature

Ma¹,

Yang²,

Wang³

et al. 2022

Microstructures

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The effects of cold rolling and subsequent annealing on the microstructures and mechanical properties of Fe40Mn20Cr20Ni20 high-entropy alloys (HEAs) are investigated. The Cr-rich secondary phases with a tetragonal structure (σ phases) in the Fe40Mn20Cr20Ni20 HEAs are precipitated upon annealing at 600 °C-900 °C for 2 h. The prepared Fe40Mn20Cr20Ni20 HEA annealed at 800 °C for 2 h after cold rolling has a good combination of strength and elongation, with a high yield strength of 438 MPa, a high ultimate tensile strength of 676 MPa, and an excellent elongation to fracture of 32%. The mechanical properties at cryogenic temperature are better than those at room temperature. Typically, for the incompletely recrystallized alloy annealed at 700 °C, the yield strength, tensile strength, and elongation after fracture are increased by 26%, 22%, and 100%, respectively. This trend mainly depends on dislocation and twinning strengthening. The σ phases also improve the cryogenic tensile properties. Furthermore, the recrystallization kinetics of the Fe40Mn20Cr20Ni20 HEAs are explored to correlate with the deformation behavior.

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“…Thus, the effect of dislocation strengthening was further enhanced in the cryogenic environment. [ 21 ] Dislocation pile‐ups against grain boundaries and entangles in the grains, as shown in Figure 8d. The larger the density of the dislocations were at the grain boundary, the greater contribution they had to the Hall–Petch effect.…”

Section: Discussionmentioning

confidence: 99%

Mechanical Properties of Rolled Copper Foils in Cryogenic and Room‐Temperature Environments

Zhao

Kong

2021

Adv Eng Mater

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The mechanical properties of high‐purity asymmetric rolled copper foils under cryogenic‐temperature and room‐temperature conditions are studied. The experimental results show that the ultimate tensile stress of the foils increases to a certain value (rolling reduction ratio ≈80%) and then decreases with a decrease in thickness when the tensile tests are carried out in the room‐temperature environment, which monotonically increases with the decrease in the foil thickness when the tensile tests are carried out in a cryogenic environment. The effect on the tensile strength of the copper foil is related to the intrinsic microstructural parameters, such as the dislocation density, grain boundary spacing, and dislocation source. The tensile test results at room and cryogenic temperatures reveal that the elongation decreases with an increase in the rolling reduction ratio. Interestingly, the copper foils of the tensile test at the cryogenic temperature exhibit better elongation than that at the room temperature.

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Superior Cryogenic Tensile Strength and Ductility of In Situ Al–Cu Matrix Composite Reinforced with 0.3 wt% Nano‐Sized TiCp

Cited by 14 publications

References 23 publications

Nanoporous Kevlar Aerogel Confined Phase Change Fluids Enable Super‐Flexible Thermal Diodes

Nanoporous Kevlar Aerogel Confined Phase Change Fluids Enable Super‐Flexible Thermal Diodes

High strength and ductility in partially recrystallized Fe40Mn20Cr20Ni20 high-entropy alloys at cryogenic temperature

Mechanical Properties of Rolled Copper Foils in Cryogenic and Room‐Temperature Environments

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