Deformation behavior of a superplastic Zn-Al eutectoid in tensile tests of constant strain rate.
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概要
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The stress-strain behavior in the constant strain rate test has been examined for the Zn-Al eutectoid while comparing with that of the constant velocity test. It has been revealed in results that a remarkable workhardening took place at 473K and favorite strain rates in the constant E test.Activation energies calculated using the maximum stress values at different temperatures were 121.6, 61.3 and 111.2kJ/mol for regions I to III. These values for regions I and III are considered to correspond to that for volume diffusion of Zn or Al, while that for region II is near to that grain boundary diffusion of Zn or Al.The examination of strain dependence of the activation energy has revealed that the energy for region I lowered with an increase of strain, while not so big change for regions II and III. This implies a possibility that the deformation is controlled by a similar process from the initial stage to just before the fracture in region II or III. On the contrary, it is very possible that the rate controlling mechanism may be altered during the deformation of region I.
- The Iron and Steel Institute of Japanの論文
The Iron and Steel Institute of Japan | 論文
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