Effect of texture on load partitioning in Ti-6Al-4V
Effect of texture on load partitioning in Ti-6Al-4V
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DOI：
10.1016/j.actamat.2012.03.039
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发表时间：
2012-06-01
期刊：
影响因子：
9.4
通讯作者：
Dye, D.
中科院分区：
文献类型：
--
作者：
Warwick, J. L. W.;Coakley, J.;Dye, D.
中子衍射已被用来表征两种 Ti-6Al-4V 板产品形式的室温塑性变形导致的不同取向晶粒中残余弹性应变的演变。使用两相弹塑性自洽模型，仅使用两种产品形式之间的纹理差异，使晶格应变的演化合理化。研究发现，整体取向和单独取向的弹性性能都可以非常令人满意地再现，β 相的 C 模量为 15 GPa。单向轧制材料产生的残余微应变通常大于交叉轧制材料，但小于 Ti-834。 (0002) 方向累积的残余应变接近于零，这只能在建模中通过假设 (c + a) 滑移的临界解析剪切应力仅为 < a > 滑移的 1.5 倍（与孤立单晶的 3 倍）相比来重现。讨论了这对我们理解这些材料变形的影响。 (c) 2012 Acta Materialia Inc. 由 Elsevier Ltd 出版。保留所有权利。
Neutron diffraction has been used to characterize the evolution of residual elastic strain in grains with different orientations due to room temperature plastic deformation in two plate product forms of Ti-6Al-4V. The evolution of lattice strains has been rationalized using a two-phase elastic-plastic self-consistent model using only the texture difference between the two product forms. It is found that the elastic properties of both the bulk and individual orientations can be reproduced quite satisfactorily, with a C modulus of the beta phase of 15 GPa. The residual microstrains produced are generally greater in the unidirectionally rolled material than the cross-rolled, but are smaller than in Ti-834. The residual strains accumulated in the (0002) orientation are near-zero, which can only be reproduced in the modelling by assuming a critical resolved shear stress for (c + a) slip only 1.5x that for < a > slip, compared to the 3x factor found for isolated single crystals. The implications of this for our understanding of deformation in these materials are discussed. (c) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.