ZHENG Chaogui LIU Hongping YE Yupu(Y.P.Yeh) Peking University
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Beijing
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ChinaQIAO Zhiyu University of Science and Technology Beijing
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Beijing
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China ZHENG Chaogui Dept.of Chemistry
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Peking University
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Beijing 100871
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China
金属学报(英文版)
Three surfaces corresponding to the primary crystallization of PrCl_3,CaCl_2 and MgCl_2 respectively,3 univariant curves related to the secondary crystallization and a ternary eutectic(44.8 wt-% PrCl_3,31.8 wt-% CaCl_2,546℃)were found in system PrCl_3-CaCl_2-MgCl_2 by means of DTA.A reaction occurs in this system: L=PrCl_3+CaCl_2+MgCl_2.
关键词:
PrCl_3-CaCl_2-MgCl_2
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QIAO Lijie LIU Rui XIAO Jimei University of Science and Technology Beijing
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Beijing
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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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