超高机械压力对ZA27合金组织形貌及固态相变的影响

ZA27 alloy was produced under super high pressure, Through Metallography microscope、 XRD、TEM reveales ZA27 changes of dendritic morphology and solid phase transition. Results show that when 5GPa super high pressure, 1500℃, common pressure compared with 5GPa , the ratio of solute diffusion coefficient is 6.724×10-4m3/mol, reduced by nearly four orders of magnitude; melting and supercooling of ZA27 are raised with the pressure increased, there have been siganificant changes on ZA27 alloy dendritic morphology under different pressure. Their dendritic morphology change from thick dentrite、thin dentrite、granular crystal、vermiform morphology to flakes and dendritic morphology of very fine dendrites; aged in the air a few months later , fix the existence of ZA27 alloy AM decomposition by XRD、TEM. It can be seen that it happens from crystal face originally.