变形温度对6082铝合金析出相、显微组织演变、力学性能和腐蚀行为的影响（英文）

发布时间：2019-08-05 18:00

【摘要】：研究深冷轧制、室温轧制和后续退火对6082铝合金析出相、显微组织演变(回复,再结晶与晶粒生长)、力学性能和腐蚀行为的影响。采用差示扫描量热仪、透射电子显微镜和背散射电子衍射研究深冷轧制、室温轧制及后续热处理样品的析出动力学和显微组织形貌,以探讨其力学性能。经200°C退火后,深冷轧制样品的抗拉强度和硬度(345 MPa和HV 127)比室温轧制样品的抗拉强度和硬度(320 MPa和HV 115)更高。200°C退火后深冷轧制样品抗拉强度和硬度得到提高是因为铝基体中析出β''相,与室温轧制样品相比产生更大的Zener阻力。与室温轧制样品的腐蚀和点蚀电位(-1.335 V和-710 mV)相比,深冷轧制样品的腐蚀和点蚀电位(-1.321 V和-700 mV)也得到提高。深冷轧制样品具有较高的位错密度,Mg_4Al_3Si_4析出相溶解到基体中,通过形成钝化保护层和抑制原电池的形成,使样品的抗腐蚀性能得到提高。
[Abstract]:The effects of cryogenic rolling, room temperature rolling and subsequent annealing on precipitated phase, microstructure evolution (recovery, recrystallizing and grain growth), mechanical properties and corrosion behavior of 6082 aluminum alloy were studied. The precipitation kinetics and microstructure of cryogenic rolling, room temperature rolling and subsequent heat treatment were studied by differential scanning Calorimeter, transmission electron microscope and backscattering electron diffraction. After annealing at 200 掳C, the tensile strength and hardness of cryogenic rolled samples (345 MPa and HV 127) are higher than those of room temperature rolled samples (320 MPa and HV 115). The increase of tensile strength and hardness of cryogenic rolled samples after annealing at 200 掳C is due to the precipitation of 尾 'phase in aluminum matrix, which produces greater Zener resistance than that of rolled samples at room temperature. Compared with the corrosion and pitting potentials (- 1.335 V and-710 mV) of the samples rolled at room temperature, the corrosion and pitting potentials (- 1.321 V and-700 mV) of the cryogenic rolled samples are also increased. The cryogenic rolled samples have high dislocation density. The precipitated phase of Mg_4Al_3Si_4 is dissolved into the matrix. The corrosion resistance of the samples is improved by forming passivation protective layer and inhibiting the formation of the original battery.
【作者单位】： Department
【分类号】：TG146.21

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