Abstract To establish the relationship between mechanical properties and microstructural features, it is necessary to comprehensively describe microstructural characterizations. In present study, an efficient and innovative quantitative method of interleaved degree in lamellar microstructure was developed. Firstly, four types of microstructural variables were defined as key factors that confirmed the microstructural features. Lath length (L) and variation coefficient for distribution of lath angle (CV) were measured to obtain dimension information of laths, and number of lath intersecting points per area (N) and uniformity of lath intersecting points (U) were defined to describe the lath distribution and the lath intersection complexity. Then, the microstructural variables were normalized based on multiple attribute decision-making. Finally, the equation of interleaved degree in lamellar microstructure was established based on entropy weight method. Present quantitative method was applied to analyze the interleaved degree of TC17 alloy containing a basketweave microstructure. It was shown that interleaved degree was higher at a deformation temperature of 930 °C, a height reduction of 40% and a strain rate of 0.1 s−1 and decreased with increasing cooling time. Besides, a model that can theoretically calculate fracture toughness based on tensile properties was utilized to prove the prediction ability of interleaved degree.

中文翻译：

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钛合金层状组织交错度的定量分析

摘要 要建立力学性能与微观结构特征之间的关系，需要对微观结构特征进行综合描述。在本研究中，开发了一种有效且创新的层状微观结构交错度定量方法。首先，将四种类型的微观结构变量定义为确认微观结构特征的关键因素。测量板条长度（L）和板条角（CV）分布变异系数，得到板条尺寸信息，定义每面积板条交叉点数（N）和板条交叉点均匀度（U）来描述板条分布和板条交叉复杂度。然后，基于多属性决策对微观结构变量进行归一化。最后，基于熵权法建立层状微结构交错度方程。应用目前的定量方法分析了含有篮织组织的TC17合金的交错度。结果表明，在变形温度为 930 °C、高度减少 40% 和应变速率为 0.1 s-1 时，交错度更高，并且随着冷却时间的增加而降低。此外，利用基于拉伸性能理论计算断裂韧性的模型证明了交错度的预测能力。结果表明，在变形温度为 930 ℃、高度减少 40% 和应变速率为 0.1 s-1 时，交错度更高，并且随着冷却时间的增加而降低。此外，利用基于拉伸性能理论计算断裂韧性的模型证明了交错度的预测能力。结果表明，在变形温度为 930 ℃、高度减少 40% 和应变速率为 0.1 s-1 时，交错度更高，并且随着冷却时间的增加而降低。此外，利用基于拉伸性能理论计算断裂韧性的模型证明了交错度的预测能力。