We use observations of Sunyaev-Zel'dovich effect and X-ray surface brightness to reconstruct the radial profiles of gas temperature and density under the assumption of a spherically symmetric distribution of the g...We use observations of Sunyaev-Zel'dovich effect and X-ray surface brightness to reconstruct the radial profiles of gas temperature and density under the assumption of a spherically symmetric distribution of the gas.The method of reconstruction,first raised by Silk & White,depends directly on the observations of the Sunyaev-Zel'dovich effect and the X-ray surface brightness,without involving additional assumptions such as the equation of state of the gas or the conditions of hydrostatic equilibrium.We applied this method to the cluster RX J1347.5-1145,which has both the Sunyaev-Zel'dovich effect and X-ray observa-tions with relative high precision.It is shown that it will be an effective method to obtain the gas distribution in galaxy clusters.Statistical errors of the derived temperature and density profiles of gas were estimated according to the observational uncertainties.展开更多
In this study,high density electric current pulse(ECP)treatment was introduced instead of the conventional solution treatment,and theγ′phase was completely dissolved under the ECP treatment within only several milli...In this study,high density electric current pulse(ECP)treatment was introduced instead of the conventional solution treatment,and theγ′phase was completely dissolved under the ECP treatment within only several milliseconds at 1148°C.Due to the extremely short treatment time and high cooling rate,the growth ofγ-phase matrix grain andγ′phase precipitate was effectively retarded.By comparing with the conventional heat process,the grain size of ECP treated sample was controlled to about 15μm,the size of the re-precipitatedγ′phase reduced from 65 to 35 nm,and the number density ofγ′precipitate increased from 1.46×108 to 3.03×108/mm2.The Vickers hardness,ultimate tensile strength and yield strength of the ECP treated sample were significantly improved.According to the theoretical derivation of kinetics,the ECP treatment introduces an extra electrical free energy which promoted the dissolution ofγ′phase.The ECP treatment may provide a new method for solution treatment of the Ni-based superalloy.展开更多
基金supported by the National Science Foundation of China(Grants No.10473002)
文摘We use observations of Sunyaev-Zel'dovich effect and X-ray surface brightness to reconstruct the radial profiles of gas temperature and density under the assumption of a spherically symmetric distribution of the gas.The method of reconstruction,first raised by Silk & White,depends directly on the observations of the Sunyaev-Zel'dovich effect and the X-ray surface brightness,without involving additional assumptions such as the equation of state of the gas or the conditions of hydrostatic equilibrium.We applied this method to the cluster RX J1347.5-1145,which has both the Sunyaev-Zel'dovich effect and X-ray observa-tions with relative high precision.It is shown that it will be an effective method to obtain the gas distribution in galaxy clusters.Statistical errors of the derived temperature and density profiles of gas were estimated according to the observational uncertainties.
基金This work was financially supported by the National Key R&D Program of China(No.2020YFA0714900)the National Natural Science Foundation of China(Nos.51874023,U1860206,51871221.51671189 and 51971231)+1 种基金the Fundamental Research Funds for the Central Universities(No.FRF-TP-20-02B)the Recruitment Program of Global Experts and the Ministry of Science and Technology of China(Nos.2017YFA0700703 and 2019YFA0705304).
文摘In this study,high density electric current pulse(ECP)treatment was introduced instead of the conventional solution treatment,and theγ′phase was completely dissolved under the ECP treatment within only several milliseconds at 1148°C.Due to the extremely short treatment time and high cooling rate,the growth ofγ-phase matrix grain andγ′phase precipitate was effectively retarded.By comparing with the conventional heat process,the grain size of ECP treated sample was controlled to about 15μm,the size of the re-precipitatedγ′phase reduced from 65 to 35 nm,and the number density ofγ′precipitate increased from 1.46×108 to 3.03×108/mm2.The Vickers hardness,ultimate tensile strength and yield strength of the ECP treated sample were significantly improved.According to the theoretical derivation of kinetics,the ECP treatment introduces an extra electrical free energy which promoted the dissolution ofγ′phase.The ECP treatment may provide a new method for solution treatment of the Ni-based superalloy.
