Modelling and prediction of mechanical properties for materials with hexagonal symmetry (zinc, titanium and zirconium alloys)
Modelling and prediction of mechanical properties for materials with hexagonal symmetry (zinc, titanium and zirconium alloys)
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DOI：
10.1016/s1359-6454(97)00099-2
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发表时间：
1997-10-01
期刊：
影响因子：
9.4
通讯作者：
Esling, C
中科院分区：
文献类型：
--
作者：
Fundenberger, JJ;Philippe, MJ;Esling, C
在这项工作中，我们模拟了具有不同织构和/或变形机制的六方材料的各种力学性质。这项工作的主要目的是非常准确地确定活动变形机制，并评估相应的CRSS比率。这项研究--由光学和电子显微镜进行--是基于对适用于每种合金的变形机制(发生频率)获得的统计数据。虽然有更复杂的模型可用，但在第一种方法中，我们使用了相对简单的泰勒模型(约束和松弛变体)，以及我们之前评估的相当可靠的CRSS比率(精度约为10%)，并在早期用于纹理演变的建模。利用这些值，我们然后模拟了屈服应力、塑性应变比和屈服轨迹在薄板平面上的变化。然后将预测的曲线与绘制的实验曲线进行比较，包括实验误差幅度。在TA6V的情况下，我们区分了金字塔[c+a](+)和[c+a](-)滑移方向。TA6V的预测屈服轨迹与实验曲线显示出相同的拉伸和压缩不对称性。(C)1997年，Acta冶金公司。
In this work we have modelled Various mechanical properties for hexagonal materials having various textures and/or deformation mechanisms. The main purpose of this work was to determine with great accuracy the active deformation mechanisms and to evaluate the corresponding CRSS ratios. This study-carried out by optical and electron microscopy-is based on the statistical data obtained for the deformation mechanisms (frequency of occurrence) applying to each alloy. Though more sophisticated models are available, we used-in a first approach-the relatively simple Taylor model (constrained and relaxed variants) with the fairly reliable CRSS ratios we had previously assessed (accuracy around 10%) and used earlier for the modelling of the texture evolution. With these values, we then modelled the variation in the sheet plane of the yield stress, the plastic strain ratio, and the yield loci. The predicted curves were then compared with the experimental ones that had been drawn, including the margin of experimental error. In the case of TA6V we made a distinction between pyramidal [c + a](+) and [c + a](-) slip directions. The predicted yield loci of TA6V show the same asymmetry in tension and compression as the experimental curves. (C) 1997 Acta metallurgica Inc.