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研究了实际生长的铜双晶体(RB),组合双晶体(CB)及其组元单晶体(G1,G2)在总应变幅控制下的循环应力-应变响应.结果表明在相同应变幅下轴向应力幅随循环进行递增顺序为G2,CB,RB及G1,而塑性应变幅则按G2,CB,RB及G1顺序递减.通过引入一个双晶体的取向因子Ω_B比较了双晶体(CB,RB)及其组元单晶体(G1,G2)的循环应力-应变曲线,其中两组元单晶体(G1,G2)的循环应力-应变曲线均存在一平台区,且平台饱和分切应力分别为30.5MPa及29.2MPa.组合双晶体CB同样也存在一平台区,其平台饱和分切应力基本与组元单晶体的饱和切应力值相等.而实际生长的双晶体RB的循环应力-应变曲线明显高于组合双晶体CB及其组元双晶体G1,G2的循环应力-应变曲线,且随应变幅升高循环饱和分切应力从31.4MPa逐渐升高到34.0MPa,没有平台区存在.
The cyclic stress-strain responses of copper double crystals (RBs), composite double crystals (CBs) and their elemental single crystals (G1 and G2) grown under the control of the total strain amplitude were investigated. The results show that under the same strain amplitude, The magnitude of stress amplitude increases with the order of G2, CB, RB and G1, while the plastic strain amplitude decreases in order of G2, CB, RB and G1. By introducing a twin crystal orientation factor Ω_B, (G1, G2). The cyclic stress-strain curves of two elemental monocrystals (G1, G2) all exist in a plateau region, and the saturation stress of the plateau is 30.5MPa and 29.2MPa. The twin bicrystal CB also has a plateau region, and its plateau saturation shear stress is almost equal to the saturated shear stress of the monocomponent monocrystal.But the cyclic stress-strain curve of RB actually grown is obviously higher than that of the composite double Cyclic stress-strain curves of crystal CB and its twin bicrystals G1 and G2 were obtained. The cyclic saturation shear stress gradually increased from 31.4 MPa to 34.0 MPa with the increase of strain amplitude, and no plateau region existed.