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新研制的ZL-205高强度铸造铝合金,其中含有0.15～0.25％Cd。为探讨镉对合金时效组织结构和抗拉强度的影响,本文对ZL-205和不含镉ZL-205-1两种合金不同时效状态的试样,进行了室温拉伸试验和透射电镜观察。试验结果表明,合金在150℃以下经4小时时效,镉阻碍G.P区的形成和长大,导致ZL-205合金的抗拉强度低于ZL-205-1合金的抗拉强度;合金在150℃以上经4小时时效,镉加速θ″和θ′相析出,抑制θ′相长大,使ZL-205合金的抗拉强度比ZL-205-1合金约高5～10公斤/毫米~2。 试验条件 合金(成分见表1)浇注成机φ12和20毫米的单铸砂型试棒,于540℃保温14小时水
Newly developed ZL-205 high strength cast aluminum alloy, which contains 0.15 ~ 0.25% Cd. In order to investigate the effect of cadmium on the microstructure and tensile strength of the alloy, the tensile tests and TEM observations of ZL-205 and non-cadmium-containing ZL-205-1 alloys under different aging conditions were carried out. The experimental results show that the aging of the alloy at 150 ℃ for 4 hours hinders the formation and growth of the GP zone by the cadmium, resulting in the tensile strength of the ZL-205 alloy being lower than the tensile strength of the ZL-205-1 alloy; at 150 ℃ After 4 hours of aging, the accelerated precipitation of θ "and θ ’phase of cadmium inhibits the growth of θ’ phase, so that the tensile strength of ZL-205 alloy is about 5 to 10 kg / mm 2 higher than that of ZL-205-1 alloy. Test conditions Alloy (composition shown in Table 1) Casting φ12 and 20 mm single cast sand test bars, 540 ° C for 14 hours water insulation