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Thermal Shock Behavior of a Novel TiCx–Ni3(Al,Ti)/Ni Functionally Graded Composite
Qun Yu,Zhenying Huang,Guangming Zheng,Wenqiang Hu,Cong Lei,Yuanbo Wang,Yidan Jiao,Hongxiang Zhai 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
This paper focuses on the study of thermal shock behaviors of a novel TiCx–Ni3(Al,Ti)/Ni functionally graded material (FGM)fabricated from Ti3AlC2and Ni powders. Thermal shock resistance of resulted FGM was conducted by water quenching atdifferent temperatures, mechanical properties and microstructures after thermal shocks were correspondingly determined andcharacterized. The microstructure of the FGM after thermal shocks shows no cracks of instability failure between the transitionzones, and the reinforcement phases were closely combined with the matrix. Meanwhile, compared with the strengthof 1329 MPa without thermal shock, when the temperature of the thermal shock reached 800 °C and 1000 °C respectively,with 10 repeated heat-water quench cycles, the residual flexural strength of FGM decreased slightly, but it could still reach1100 MPa. Notably, the strength can still maintain at 843 MPa after 10 cycles of thermal shock at 1200 °C. Such excellentthermal shock performance may be the result of the good interfacial bonding and the special gradient structure, the oxidationlayer also plays a protective role.
Predicament, Opportunity and Path: Reflections on the Development of Tai Chi in the New Era
LI Qun,FENG CHAO-Hai,LEI Tao,WU Zh-iheng,SU Jian-jiao 아시아건강운동학회 2021 Journal of Asian Society for Health & Exercise Vol.3 No.2
The new era has entrusted the era mission of high-quality development of Tai Chi. Standing in a new historical position, this thesis uses the method of literature and logical analysis to explore the realistic difficulties, opportunities of the times and breakthrough paths in the development of Tai Chi, which is a reflection on the breakthrough of the development of it. The research believes that the development of Tai Chi in the new era has the predicament of slow domestic and international development, the gradual dissipation of martial arts functions, and the gradual weakening of cultural attributes. However, the new era has also brought a new opportunity for the Tai Chi movement to have a clearer development blueprint, a more stable social foundation, and a healthy concept deeply rooted in the hearts of the people. The development of Tai Chi in the new era should be guided by a new pattern of domestic development and international promotion. The development of Tai Chi in the new era should be guided by the construction of a new dual-cycle pattern of domestic development and international promotion, the strategy of coordinating the balance of Tai Chi sports competition and fitness functions, and the means of the integration of school education and cultural exchange, so as to realize the high-quality development of Tai Chi.
Huquan Gao,Tian-Jiao Zhu,De-Hai Li,Qian Qun Gu,Weizhong Liu 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.8
One new prenylated indole diketopiperazinealkaloid, named dihydroneochinulin B (1), one known spiropolyketide-diketopiperazine hybrid cryptoechinuline D (2)and three related known metabolites didehydroechinulin B(3), neoechinulin B (4) and auroglaucin (5) were isolatedfrom the mangrove rhizosphere soil derived fungus, Aspergilluseffuses H1-1. The structures were assigned by detailedspectroscopic analysis. The enantiomers of cryptoechinulineD (2) were separated to be (?)-cryptoechinuline D (2a) and(-)-cryptoechinuline D (2b) by chiral HPLC, and theirabsolute configurations were determined by ECD analysis. The cytotoxic effects of the compounds were preliminarilyevaluated on P388, HL-60, BEL-7402 and A-549 cell linesby SRB or MTT methods, and compounds 2, 2a and 3showed significant activities.
Guangming Zheng,Zhenying Huang,Qun Yu,Wenqiang Hu,Xingyang Qiu,A. Lixia,Yuanbo Wang,Yidan Jiao,Yang Zhou,Hongxiang Zhai 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.6
In this paper, a novel type of functionally graded material (FGM) was successfully fabricated from pure Ni and Ti3AlC2powder mixtures by hot-press sintering route at 1200 °C and 17 MPa. In each layer, Ti3AlC2particles transformed into TiCxphase, while the additional Al–Ti atoms decomposed from Ti3AlC2diffused into the Ni matrix, giving rise to the formationof γ′-Ni3(Al,Ti). Part of the submicron TiCxand Ni3(Al,Ti) particles were uniformly distributed in the Ni matrix, whilesome of the TiCxmaintained the original Ti3AlC2plate-like morphology. Both TiCxand Ni3(Al,Ti) content decreased from60Ti3AlC2/Ni layer to 10Ti3AlC2/Ni layer in a stepwise manner was fabricated. The microstructural analysis indicatesthat no cracks, delamination and step-type abrupt changes occured in the graded layer of the manufactured FGM. Flexuralstrength and Vickers hardness enhanced with the increasing Ti3AlC2content except for fracture strain and toughness. Theoverall fracture toughness and the flexural strength of FGM can reach 21.76 MPa m1/2 and 1329 ± 34 MPa, respectively. Theprepared FGM, herein, with a hard ceramic surface on one side to resist local plastic deformation, and a ductile metallicsurface on the other side to provide toughness.
Investigation on High Temperature Mechanical Behaviors of TiC-γ′ Reinforced Ni Composite
Wenqiang Hu,Zhenying Huang,Qun Yu,Yuanbo Wang,Yidan Jiao,Yang Zhou,Hongxiang Zhai 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
A duplex TiC and γ′-Ni3(Al,Ti) reinforced nickel composite was fabricated through hot-press sintering a 30 vol% Ti2AlC–Nimixtures followed by thermal treatment method. Detailed microstructural detection was performed by adopting the routeof high-resolution transmission electron microscopy. In situ generated submicron TiC particulate and nanosized L12-γ′were homogeneously distributed in a fcc γ-Ni matrix. The high temperature tensile and compression behaviors of the TiC-γ′/Ni composites were evaluated in the temperature range of 25–800 °C. The results indicated that ultimate tensile andcompression properties exhibited the dependence of temperatures. The tensile properties of the composite determined at600 °C was 945 MPa, decreasing by 28.1% and 23.0% for elongation, compared to those of measured at room temperature(UTS = 1305 MPa, elongation = 5.35%). However, the yield strength exhibited the temperature independent until to 600 °C. The yield strength of the TiC-γ′/Ni composite are comparable with conventional superalloy under 600 °C, proving that TiCand γ′ particles constitute efficient reinforcements for Ni matrix according to thermal expansion dislocations strengthening,load-transfer and coherent strengthening mechanisms. The monotonic temperature dependence of yield strength at600–800 °C indicates that plastic deformation of TiC-γ′/Ni composite follows the thermally activated mechanism. TheTiC-γ′/Ni composite exhibited superior mechanical properties both at room and high temperatures, which can be ascribedto the synergistic strengthening effect in term of dislocation density, Orowan, coherent and atomic ordering strengtheningmechanisms. The present work reveals the deformation behaviors of in situ TiC-γ′/Ni composite from room to high temperatures,which is critical to predict the failure and thereby optimize the microstructure to further enhance the high temperatureproperties of TiC-γ′/Ni composite.
De-Hai Li,Tian-Jiao Zhu,Hong-Bing Liu,Yu-Chun Fang,Qian-Qun Gu,Wei-Ming Zhu 대한약학회 2006 Archives of Pharmacal Research Vol.29 No.8
Four known butenolides were isolated from the ethyl acetate extracts of the culture broth of the marine-derived bacterium, Streptoverticillium luteoverticillatum, by bioassay-guided fractionation. The structures were identified on the basis of spectral data. The absolute configuration of compound (1) was determined by CD spectrum for the first time. Compounds 1-4 showed in vitro cytotoxicity against the murine lymphoma P388 and human leukemia K562 cell lines. This is the first report on the isolation of butenolides from the marine bacterium, Streptoverticillium luteoverticillatum, and their cytotoxic activities.
Zhen-Jian Lin,Xiao-Ming Lu,Tian-Jiao Zhu,Yu-Chun Fang,Qian-Qun Gu,Weiming Zhu 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.9
An endophytic Streptomyces sp. (AC-2) was isolated from the root of Cistanches deserticola Y.C.Ma..Chemical investigations of the culture broth of AC-2 afforded fifteen compounds including K1115 A (1), tyrosol (2), phenylethylamine derivatives (3, 4), cyclic dipeptides (5-8), nucleosides and their aglycones (9-13), N-acetyltryptamine (14), and pyrrole-2-carboxylic acid (15). Only tyrosol can promote an increase of intracellular cAMP special on GPR12 transfected cells, such as CHO and HEK293, which means it may be a possible ligand for GPR12.
Zhi-Hong Xin,Li-Tian,Tian-jiao Zhu,Wen-Liang Wang,Lin Du,Yu-chun Fang,Qian-Qun Gu,Wei-Ming Zhu 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.7
Two isocoumarin derivatives, stoloniferol A (1) and B (2), a known 5α, 8α-epidioxy-23-methyl- (22E, 24R)-ergosta-6, 22-dien-3β-ol (3), and a known dihydrocitrinone (4) were isolated from the ethyl acetate extract of the sea squirt-derived fungus, Penicillium stoloniferum QY2-10, and a halophilic fungus, Penicillium notatum B-52, respectively. Their structures were elucidated by spectroscopic methods and optical rotation. The stereochemistry of 2 was determined on the basis of different NOE experiments and chemical transformation. Compound 3 showed cytotoxicity against P388 cells, with an IC50 value of 4.07 µM.
Xin, Zhi-Hong,Tian, Li,Zhu, Tian-Jiao,Wang, Wen-Liang,Du, Lin,Fang, Yu-Chun,Gu, Qian-Qun,Zhu, Wei-Ming 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.7
Two isocoumarin derivatives, stoloniferol A (1) and B (2), a known $5{\alpha}$, $8{\alpha}-epidioxy-23-methyl-(22E, 24R)-ergosta-6$, $22-dien-3{\beta}-ol$ (3), and a known dihydrocitrinone (4) were isolated from the ethyl acetate extract of the sea squirt-derived fungus, Penicillium stoloniferum QY2-10, and a halophilic fungus, Penicillium notatum B-52, respectively. Their structures were elucidated by spectroscopic methods and optical rotation. The stereochemistry of 2 was determined on the basis of different NOE experiments and chemical transformation. Compound 3 showed cytotoxicity against P388 cells, with an $IC_{50}$ value of 4.07 ${\mu}M$.
Saroclazines A–C, thio-diketopiperazines from mangrove-derived fungi Sarocladium kiliense HDN11-84
Feng Li,Wenqiang Guo,Li Wu,Tian-jiao Zhu,Qian Qun Gu,De-Hai Li,Qian Che 대한약학회 2018 Archives of Pharmacal Research Vol.41 No.1
Three new diketopiperazine derivatives (DKPs), saroclazines A–C (1–3) along with three known DKPs (4– 6) were isolated from mangrove-derived fungi Sarocladium kiliense HDN11-84. Saroclazines A–B (1 and 2) possessed a free amide structure, which was first found in sulfurcontaining aromatic DKPs. Their structures were elucidated by NMR, HRESIMS and X-ray. The cytotoxic activity of new compounds (1–3) was tested against HeLa cell lines, among which compound 2 showed an IC50 value of 4.2 lM.