In order to understand the initial surface damage of Al piston in unsteady thermal environment like knock combustion,T6 heat treated cast Al-Si-Cu alloy was thermal shocked under different heating speeds between room ...In order to understand the initial surface damage of Al piston in unsteady thermal environment like knock combustion,T6 heat treated cast Al-Si-Cu alloy was thermal shocked under different heating speeds between room temperature and 450°C by adjusting the environmental temperature.The surface evolution was mainly characterized in view of roughness,hardness,morphology,texture,phase and element distribution.Results indicated that both the roughness and hardness went up to the maximum and then decreased with rising heating speed.Micro-structure and phase analysis suggested that the interactions of solid phase transition and oxidation with enhancing thermal stress took responsible for the surface evolution.展开更多
We study the effect of dark matter heating on the temperature of typical strange star(SS hereafter)(M=1.4 M⊙,R=10 km)in normal phase(NSS hereafter)and in a possible existing colour-flavour locked(CFL)phase(CSS hereaf...We study the effect of dark matter heating on the temperature of typical strange star(SS hereafter)(M=1.4 M⊙,R=10 km)in normal phase(NSS hereafter)and in a possible existing colour-flavour locked(CFL)phase(CSS hereafter).For NSS,the influence of dark matter heating is ignored until roughly 107yr.After 107yr,the dark matter heating is dominant that significantly delays the star cooling,which maintains a temperature much higher than that predicted by standard cooling model for old stars.Especially for CSS,the emissivity of dark matter will play a leading role after roughly 104yr,which causes the temperature to rise.This leads to the plateau of surface temperature appearing in～106.5yr which is earlier than that of NSS(～107yr).展开更多
基金Project(DLBF2018-KY-JS-066-J)supported by the China North Engine Research InstituteProject(51902239)supported by the National Natural Science Foundation of China+3 种基金Project(2020JQ-808)supported by the Science and Technology Fund of Shaanxi Province,ChinaProjects(19JK0400,19JK0402)supported by the Education Fund of Shaanxi Province,ChinaProject(S202010702070)supported by the Innovation and Entrepreneurship Training Program for College Students,ChinaProject supported by the Youth Innovation Team of Shaanxi Universities:Metal Corrosion Protection and Surface Engineering Technology,China。
文摘In order to understand the initial surface damage of Al piston in unsteady thermal environment like knock combustion,T6 heat treated cast Al-Si-Cu alloy was thermal shocked under different heating speeds between room temperature and 450°C by adjusting the environmental temperature.The surface evolution was mainly characterized in view of roughness,hardness,morphology,texture,phase and element distribution.Results indicated that both the roughness and hardness went up to the maximum and then decreased with rising heating speed.Micro-structure and phase analysis suggested that the interactions of solid phase transition and oxidation with enhancing thermal stress took responsible for the surface evolution.
基金supported by the National Natural Science Foundation of China(Grant Nos.11103004,11073008,and 11178001)the Self-Determined Research Funds of CCNU(Grant no.CCNU09A01020)from the Colleges’Basic Research and Operation of NO of China
文摘We study the effect of dark matter heating on the temperature of typical strange star(SS hereafter)(M=1.4 M⊙,R=10 km)in normal phase(NSS hereafter)and in a possible existing colour-flavour locked(CFL)phase(CSS hereafter).For NSS,the influence of dark matter heating is ignored until roughly 107yr.After 107yr,the dark matter heating is dominant that significantly delays the star cooling,which maintains a temperature much higher than that predicted by standard cooling model for old stars.Especially for CSS,the emissivity of dark matter will play a leading role after roughly 104yr,which causes the temperature to rise.This leads to the plateau of surface temperature appearing in～106.5yr which is earlier than that of NSS(～107yr).
