The internal friction of alloys in martensite state is believed to be an M/M interface one, which can be explained by an expression deduced from the theory of dislocation internal fric- tion.The internal friction duri...The internal friction of alloys in martensite state is believed to be an M/M interface one, which can be explained by an expression deduced from the theory of dislocation internal fric- tion.The internal friction during martensitic transformation consists of two parts,including those of the M/M interface and of the phase transformation.The latter is further composed of two portions,the major one produced by reverse martensitic transformation and the other from stress-induced martensite.It was also found that the degradation of damping properties of the CuZnAl alloys is related to the dislocation,which is introduced from the exciting pro- cess,and tends to be of stable value after certain excitements.展开更多
High optical quality single crystal fibers of β-BaB_(2)O_(4)(BBO),an important nonlinear optical material,were grown along the second-harmonic generation phase matching direction by the laser heated pedestal growth m...High optical quality single crystal fibers of β-BaB_(2)O_(4)(BBO),an important nonlinear optical material,were grown along the second-harmonic generation phase matching direction by the laser heated pedestal growth method.The effects of various growth parameters,especially growth rate,on growth stability and fiber quality were investigated.It was found that 0,25mm/min is the suitable growth rate which can reduces the harmful effects of growth anisotropy and constitutional supercooling on fiber quality.展开更多
基金the Vibration Lab.of Dept.of Mechanical Engineering,Zhejiang University and Tiantai Copper-Working Factory for their supports
文摘The internal friction of alloys in martensite state is believed to be an M/M interface one, which can be explained by an expression deduced from the theory of dislocation internal fric- tion.The internal friction during martensitic transformation consists of two parts,including those of the M/M interface and of the phase transformation.The latter is further composed of two portions,the major one produced by reverse martensitic transformation and the other from stress-induced martensite.It was also found that the degradation of damping properties of the CuZnAl alloys is related to the dislocation,which is introduced from the exciting pro- cess,and tends to be of stable value after certain excitements.
文摘High optical quality single crystal fibers of β-BaB_(2)O_(4)(BBO),an important nonlinear optical material,were grown along the second-harmonic generation phase matching direction by the laser heated pedestal growth method.The effects of various growth parameters,especially growth rate,on growth stability and fiber quality were investigated.It was found that 0,25mm/min is the suitable growth rate which can reduces the harmful effects of growth anisotropy and constitutional supercooling on fiber quality.
