Abstract In this paper the solute concentration in solid solution and precipitated phase content in alloy are altered by solution treatment at different temperature. The influence on dislocation movement is analyzed by test result, and the micro-mechanism of dynamic strain aging (DSA) is discussed. In the test, when solution treatment temperature reduces stepwise from 500℃, the amplitude of the serrated flow decreases until it reaches minimum at 300℃. And the amplitude increases on the contrary when solution treatment temperature reducing unceasingly to 100℃. When solution treatment temperature is higher than 300℃, solute concentration is the key factor of DSA and its increasing leads to the enhancing of DSA. When solution treatment temperature is lower than 300℃, the intensity of DSA is determined by precipitated phase density and enhances with it increasing.
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