QIAO Lijie LIU Rui XIAO Jimei University of Science and Technology Beijing
,
Beijing
,
China
金属学报(英文版)
The effects of stress components on nucleation sites and propagation directions of stress cor- rosion cracks in brass were investigated with specimens under mode Ⅱ and mode Ⅲ loadings. The results indicated that under mode Ⅱ loading,stress corrosion cracks nucleated on the site with maximum normal stress component and propagated along the plane perpendieular to the maximum normal stress,under mode Ⅲ loading,the stress corrosion crack was not evident on the 45°plane due to the general corrosion in aqueous solution with high NH_4OH concentra- tion,while stress corroded in aqueous solution with low NH_4OH concentration, numerous cracks with spacings of 10—150μm were found on the 45°plane with maximum normal stress and no stress corrosion cracks was observed on the plane with maximum shear stress.
关键词:
stress corrosion cracking
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WANG Zidong
,
HU Hanqi(University of Science and Technology Beijing.Beijing
,
China)Li Qingchun(Harbin institute of Technology
,
Harbin.ChinaManuscript received 14 April 1995)
金属学报(英文版)
In this Paper,interaction coefficients among Al,Ti and C in Al-Ti-C ternary system and actual free energy of Al_3Ti,TiC and Al_4C_3,were calcutated via ternary alloy thermodynamic theory.The rsults show that,at low temperatures,Al_3Ti forms through the reaction of aluminium with titanium,and at high temperatures,the TiC forms hy the reaction of carbon with Al_3Ti.The reaction mechanism was verified by the experimental results.
关键词:
:thermodynamics
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