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DYNAMIC RECRYSTALLIZATION OF INTERMETALLIC COMPOUND Fe_3AI

LIN Junpin , WANG Jingyun , CHU Wuyang , XIAO Jimei (University of Science and Technology Beijing , Beijing 100083) , China

金属学报(英文版)

Dynamic restoration mechanism of Fe3Al during hot compression at 900-1300℃and strain rates of 1-10~(-3)s~(-1)was studied. For values of the parameter Z larger or lower than the critical value, the dynamic recrystallization or recovery only may take place respectively. Dynamic recrystallization occurs through subgrain nucleation. The true stress increases with the increase of true strain during hot compression. The jerky flow appears in all true stress-true strain curves and more obvious with the decrease of the strain rate.

关键词: : dynamic recrtstallization; Fe_3Al; hot compression

CORRELATION BETWEEN STRESS COMPONENTS AND STRESS CORROSION CRACKS IN BRASS Lecturer,Department of Materials Physics,University of Science and Technology Beijing,Beijing 100083,China

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 , null , null , null

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