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首页> 外文期刊>Journal of Materials Research >Orientation informed nanoindentation of α-titanium: Indentation pileup in hexagonal metals deforming by prismatic slip
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Orientation informed nanoindentation of α-titanium: Indentation pileup in hexagonal metals deforming by prismatic slip

机译：定向钛纳米压痕：六方金属因棱柱滑移而产生的压痕堆积

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摘要

This study reports on the anisotropic indentation response of α-titanium. Coarse-grained titanium was characterized by electron backscatter diffraction. Sphero-conical nanoindentation was performed for a number of different crystallographic orientations. The grain size was much larger than the size of the indents to ensure quasi-single-crystal indentation. The hexagonal c-axis was determined to be the hardest direction. Surface topographies of several indents were measured by atomic force microscopy. Analysis of the indent surfaces, following Zambaldi and Raabe (Acta Mater. 58(9), 3516-3530), revealed the orientation-dependent pileup behavior of ot-titanium during axisymmetric indentation. Corresponding crystal plasticity finite element (CPFE) simulations predicted the pileup patterns with good accuracy. The constitutive parameters of the CPFE model were identified by a nonlinear optimization procedure, and reproducibly converged toward easy activation of prismatic glide systems. The calculated critical resolved shear stresses were 150 ± 4, 349 ± 10, and 1107 ± 39 Mpa for prismatic and basal -glide and pyramidal (c + a)-glide, respectively.
机译：该研究报道了α-钛的各向异性压痕响应。粗晶粒钛的特征在于电子反向散射衍射。对许多不同的晶体学取向进行了圆锥形的纳米压痕。晶粒尺寸比压痕尺寸大得多，以确保准单晶压痕。将六边形c轴确定为最硬的方向。通过原子力显微镜测量了几个压痕的表面形貌。 Zambaldi和Raabe（Acta Mater。58（9），3516-3530）之后的压痕表面分析显示，在轴对称压痕过程中，ot钛的取向依赖性堆积行为。相应的晶体可塑性有限元（CPFE）模拟可以很好地预测堆积模式。 CPFE模型的本构参数是通过非线性优化程序确定的，并且可复制地收敛到易于激活的棱柱滑行系统。对于棱柱形和基面滑移和金字塔形（c + a）滑移，计算的临界解析剪切应力分别为150±4、349±10和1107±39 Mpa。

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  • 来源
    《Journal of Materials Research》 |2012年第1期|p.356-367|共12页
  • 作者

    Claudio Zambaldi; Yiyi Yang; Thomas R. Bieler; Dierk Raabe;

  • 作者单位

    Max-Planck-Institut fuer Eisenforschung, 40237 Duesseldorf, Germany;

    Department of Chemical Engineering and Materials Science, Michigan State University,East Lansing, Michigan 48824-1226;

    Department of Chemical Engineering and Materials Science, Michigan State University,East Lansing, Michigan 48824-1226;

    Max-Planck-Institut fuer Eisenforschung, 40237 Duesseldorf, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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