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孙 帅,鄂大辛.预应变对TA2纯钛板室温滞后回弹的影响[J].稀有金属材料与工程(英文),2017,46(12):3739~3743.[Sun Shuai and E Daxin.The effect of pre-strain for the time-dependent springback of TA2 pure titanium at room temperature[J].Rare Metal Materials and Engineering,2017,46(12):3739~3743.]
The effect of pre-strain for the time-dependent springback of TA2 pure titanium at room temperature
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Received:August 26, 2015  Revised:December 16, 2015
DOI:
Key words: TA2 pure titanium  tensile deformation  time-dependent springback  plastic instability
Foundation item:国家自然科学基金资助(项目号51175044)
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Sun Shuai and E Daxin  
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Abstract:
      In order to reveal the effect of pre-strain for the time-dependent springback, the TA2 titanium sheets were drawn under different pre-strains by using the universal testing machine. The microstructures of the tested samples were both characterized by optical microscope and transmission electron microscope to infer the basis of the anelastic behavior. The results reveal that the time-dependent response of TA2 was obvious. The time-dependent-springback strain(TDSS) presented different exponential change laws in different plastic deformation zones. Both the TDSS and the amount of deformation twin increased as the pre-strain went up. The loading history and the interaction between dislocation and twin affected the TDSS and the relaxation-saturation time tIP.