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首页> 外文期刊>Materials Characterization >(109992)Sequential {1122} twinning associated with primary {1124} twins in commercial-purity titanium subjected to cryorolling
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(109992)Sequential {1122} twinning associated with primary {1124} twins in commercial-purity titanium subjected to cryorolling

机译：（109992）与初级{1124}双胞胎相关的序列{1122}在经过低温的商业纯度钛合金中

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摘要

{1122} (CI) and {1124} (C2) contraction twins are commonly observed in commercial-purity titanium cryor-olled to 4% reduction. In this study, sequential {1122} twinning associated with pre-existing primary {1124} twin is for the first time identified. The six possible {1122} (or {1124}) variants are defined as follows: V_1: (112k), V_2: (T2Tk), V_3: (211k), V_4: (IT2k), V_5: (121k), and V_6: (2lTk), where k = 2 for {1122} twins (or k = 4 for {1124} twins). According to electron back-scatter diffraction analysis, sequential {1122} twinning can be divided into two types: (I) sequential CIV; twinning nucleated in the matrix grain at primary C2V_i twin boundary (TB); (II) sequential CIV_i twinning originated from the intersection of primary C2V_i and ClV_(i+3) twins. The Schmid factor cannot explain the preference of CIV; twinning in two types. Regarding Type I, the geometrical compatibility factor (m') analysis shows that the favored CIV_i twinning has the largest m' value among the six variants with respect to primary C2V_i twin and can be stimulated by the C2V_i twinning shear transmission. And the nucleation of sequential twinning can be facilitated by the dissociation of basal dislocations at C2V_i TB. Regarding Type II, the displacement gradient tensor accommodation analysis reveals that the preferred ClVj twinning requires the least accommodation in the two neighboring twins among all possible {1122} and {1124} variants. Additionally, basal dislocation is required in the primary ClV_(i+3) twin to accommodate the shear induced by C2V_i twin, and it can be dissociated into three CIV_i twining dislocations at C1V1+3TB, providing another way to accelerate the nucleation of sequential twinning. These findings contribute to the understanding of complicated twinning behavior in cryorolled Ti.
机译：{1122}（CI）和{1124}（C2）收缩双胞胎在商业纯度钛Cryored-insto降低至4％的4％中观察到。在本研究中，与预先存在的主要{1124}双胞胎相关的顺序{1122} Twinning是第一次确定的。六种可能的{1122}（或{1124}）变体定义如下：V_1：（112K），V_2：（T2TK），V_3：（211K），V_4：（IT2K），V_5：（121K）和V_6 ：（2LTK），其中K = 2对于{1122}双胞胎（或k = 4用于{1124}双胞胎）。根据电子背散射衍射分析，顺序{1122}孪生可分为两种类型：（i）顺序文明;在初级C2V_I双边界（TB）的基质晶粒中孪生核; （ii）顺序Civ_i Twinning来自主C2V_I和CLV_（I + 3）双胞胎的交叉点。施密因素无法解释公民的偏好;两种类型孪生。关于I型，几何兼容性因数（M）分析表明，有利的Civ_I Twinning在六个变体中具有相对于初级C2V_I双胞胎的六个变体中的最大值，并且可以通过C2V_I孪晶剪切透射刺激。并且通过C2V_I Tb的基础脱位的解离，可以促进序贯孪晶的成核。关于II型，位移梯度张量容纳分析显示，优选的CLVJ Twinning需要在所有可能的{1122}和{1124}变体中的两个相邻双胞胎中的最小容纳。另外，在初级CLV_（I + 3）双床中需要基础脱位，以适应由C2V_I双胞胎的剪切，并且可以在C1V1 + 3TB中解离三个CIV_I缠绕位错，提供另一种加速顺序孪生核的核心。这些调查结果有助于了解CryoRoled Ti中的复杂性孪生行为。

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