The Mechanism of Slip System Activation with Grain Rotation During Superplastic Forming

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL Journal of Engineering Materials and Technology-transactions of The Asme Pub Date : 2022-09-26 DOI:10.1115/1.4055779
Junzhou Yang, J.J. Wu, Zhiguo Li, H. Xie, Zongcai Zhang, Mengyuan Wang
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Abstract

The activated slip system of Ti-6Al-4V alloy during the superplastic forming (SPF) was investigated by the in-grain misorientation axes analysis (IGMA), and the mechanisms of slip model activation have been discussed. Depending on the distribution of IGMA, one significant discovery from this study is that all the basal, prismatic, and pyramidal slip systems would be activated. Considering the effective slip models, Schmid factors, and the Euler angles together, it is suggested that the dominant slip systems not only desired the largest Schmid factors but strongly demand continuous Schmid factors among the adjacent grains. Meanwhile, the estimated critical resolved shear stress (CRSS) on basal and prismatic at the temperature of 920°C with the strain rate of 10−3/s is given. An original method of roughly estimating dominant slip models with Euler angles has been introduced, which predicts that grain rotation may change the slip model. Furthermore, Crystal Plasticity Finite Element Method (CPFEM) is employed to simulate the evolution of Euler angles, and the grain orientation presents the largest set of significant clusters around the (1 100) after deformation. Besides, the continuity of the Schmid factor assumption for the activated slip model has also been verified by CPFEM. In addition, the eigenvector corresponding to the eigenvalue λ1=1 of Euler angle rotation matrix is calculated to be aligned with the grain rotation axis, which can be applied to describe the grain rotation.
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超塑性成形过程中晶粒旋转激活滑移体系的机理
采用晶粒内取向轴差分析方法研究了Ti-6Al-4V合金超塑性成形过程中的激活滑移系统,并对滑移模型激活机制进行了探讨。根据IGMA的分布,本研究的一个重要发现是,所有的基底、棱柱和锥体滑移系统都将被激活。考虑到有效滑移模型、Schmid因子和欧拉角,认为主导滑移系统不仅需要最大的Schmid系数,而且强烈要求相邻晶粒之间的连续Schmid因素。同时,给出了应变速率为10−3/s、温度为920°C时基底和棱柱体上的临界分解剪切应力(CRSS)。介绍了一种利用欧拉角粗略估计主滑移模型的原始方法,该方法预测晶粒旋转可能会改变滑移模型。此外,采用晶体塑性有限元方法(CPFEM)模拟了欧拉角的演变,变形后的晶粒取向在(1100)附近呈现出最大的一组重要团簇。此外,CPFEM还验证了激活滑移模型Schmid因子假设的连续性。此外,计算出欧拉角旋转矩阵的特征值λ1=1对应的特征向量与晶粒旋转轴对齐,可用于描述晶粒旋转。
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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