Aging treatments at the temperature range of 1000-1200 ℃ for different time intervals (10, 30, 60min) in a solution-treated 2205 duplex stainless steel(DSS) are carried out respectively. The migration of γ/α interface boundary after different ageing treatments is measured by optical metallography and calculated by DICTRA software. The agreement of the calculation and experimental results is satisfied. The migration of γ/α interface boundary with increased keeping time depends on the chemical potential of chromium in each phase. At the aging temperature of 1100℃, the back diffusion effect of chromium results in the opposite direction migration of γ/α interface, therefore, the ferrite volume fraction gets lower at first and then gets higher after 1800s diffusion
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