Anisotropic Properties of Polyacrylonitrile- and Pitch-based Carbon Fibers Anisotropic Properties of Polyacrylonitrile- and Pitch-based Carbon Fibers K. Naito 1,2 1 Research Center for Structural Materials, National Institute for Materials Science (NIMS) K. Naito 1,2 2 Department of Aerospace Engineering, Tohoku University 1 Research Center for Structural Materials, National Institute for Materials Science (NIMS) 2 Department of Aerospace Engineering, Tohoku University Polyacrylonitrile (PAN)-based and pitch-based carbon fibers with high axial stiffness and strength have been used to reinforce polymer-matrix materials in advanced composites. The trends in the Polyacrylonitrile (PAN)-based and pitch-based carbon fibers with high axial stiffness and strength development of carbon fibers are characterized as follows; high tensile strength, a fairly high strain to have been used to reinforce polymer-matrix materials in advanced composites. The trends in the failure (approximately 2%) and a high specific modulus with high thermal conductivity. Several high development of carbon fibers are characterized as follows; high tensile strength, a fairly high strain to strength (exceeding 5 GPa) PAN-based and high modulus (more than 900 GPa) pitch-based carbon failure (approximately 2%) and a high specific modulus with high thermal conductivity. Several high fibers are commercially available at present. However, these fibers exhibit large anisotropies in the radial strength (exceeding 5 GPa) PAN-based and high modulus (more than 900 GPa) pitch-based carbon and axial directions. In addition, limited data has been reported on the elastic properties of fibers in other fibers are commercially available at present. However, these fibers exhibit large anisotropies in the radial directions than longitudinal and transversal directions, and on the relationship between anisotoropic and axial directions. In addition, limited data has been reported on the elastic properties of fibers in other properties and fiber structures. In this study, the anisotoropic, structural and mechanical properties of directions than longitudinal and transversal directions, and on the relationship between anisotoropic PAN- and pitch-based carbon fibers were clarified in order to use multiscale analysis and optimum properties and fiber structures. In this study, the anisotoropic, structural and mechanical properties of design of composite materials. PAN- and pitch-based carbon fibers were clarified in order to use multiscale analysis and optimum design of composite materials. Examining the Cryogenic Elastocaloric Effect in a Cu-Al-Mn Alloy Examining the Cryogenic Elastocaloric Effect in a Cu-Al-Mn Alloy Sheng Xu 1, Yuxin Song 1, Tatsuya Ito 2, Takuro Kawasaki 2, Stefanus Harjo 2, Toshihiro Omori 1 and Ryosuke Kainuma 1 Sheng Xu 1, Yuxin Song 1, Tatsuya Ito 2, Takuro Kawasaki 2, Stefanus Harjo 2, 1 Department of Materials Science, Tohoku University Toshihiro Omori 1 and Ryosuke Kainuma 1 2 J-PARC Center, Japan Atomic Energy Agency 1 Department of Materials Science, Tohoku University 2 J-PARC Center, Japan Atomic Energy Agency In the quest to realize a hydrogen society, efficient cryogenic methods for handling liquid hydrogen are important. Though gas refrigeration is the practically used technique, its energy efficiency is less In the quest to realize a hydrogen society, efficient cryogenic methods for handling liquid hydrogen than ideal. The focus is now shifting towards solid refrigeration that exploits the elastocaloric or the are important. Though gas refrigeration is the practically used technique, its energy efficiency is less magnetocaloric effects. Especially the elastocaloric effect using superelastic alloys is known for than ideal. The focus is now shifting towards solid refrigeration that exploits the elastocaloric or the potentially superior cooling efficiency. However, there is a hitch: conventional superelastic alloys, such magnetocaloric effects. Especially the elastocaloric effect using superelastic alloys is known for as Ni-Ti, lose their superelasticity at ultra-low temperatures [1]. In contrast, we have reported that Cu-Al-potentially superior cooling efficiency. However, there is a hitch: conventional superelastic alloys, such Mn alloy retains this property even at a temperature of 4.2 K, which highlights its potential in cryogenic as Ni-Ti, lose their superelasticity at ultra-low temperatures [1]. In contrast, we have reported that Cu-Al-elastocaloric applications [2]. This research aims to examine the elastocaloric effect and assess the alloy's Mn alloy retains this property even at a temperature of 4.2 K, which highlights its potential in cryogenic durability. We synthesized Cu-17Al-14Mn (at%) single-crystalline alloys, which exhibited remarkable elastocaloric applications [2]. This research aims to examine the elastocaloric effect and assess the alloy's superelasticity ranging from roughly 6 K to 120 K. By gauging the near-adiabatic temperature shift of durability. We synthesized Cu-17Al-14Mn (at%) single-crystalline alloys, which exhibited remarkable the sample during rapid unloading, it was validated that the cooling induced by the elastocaloric effect superelasticity ranging from roughly 6 K to 120 K. By gauging the near-adiabatic temperature shift of persists down to about 24 K. Below this temperature, dissipation heating prevails. This observation the sample during rapid unloading, it was validated that the cooling induced by the elastocaloric effect dovetails with our thermodynamic evaluation. Additionally, cyclic loading-unloading tests conducted at persists down to about 24 K. Below this temperature, dissipation heating prevails. This observation 21 K brought to light the alloy's enhanced fatigue resistance under cryogenic conditions. dovetails with our thermodynamic evaluation. Additionally, cyclic loading-unloading tests conducted at [1] Niitsu K. et al. Applied Physics Letters 102, 231915 (2013). 21 K brought to light the alloy's enhanced fatigue resistance under cryogenic conditions. [2] Niitsu K. et al. NPG Asia Materials 10, e457 (2018). [1] Niitsu K. et al. Applied Physics Letters 102, 231915 (2013). [2] Niitsu K. et al. NPG Asia Materials 10, e457 (2018). 58PP33--0011 PP33--0011 PP33--0022 PP33--0022 Poster Presentation ｜NIMS Award Symposium 2023 P3 ｜ EvaluationWu Gong 2, Xiao Xu 1, Wu Gong 2, Xiao Xu 1,
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