Lattice strain evolution during tensile and compressive loading of CP Ti
Lattice strain evolution during tensile and compressive loading of CP Ti
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DOI：
10.1016/j.actamat.2012.08.042
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发表时间：
2012-11
期刊：
影响因子：
9.4
通讯作者：
J. Warwick;N. Jones;K. Rahman;D. Dye
中科院分区：
文献类型：
--
作者：
J. Warwick;N. Jones;K. Rahman;D. Dye
使用中子衍射、自洽建模和显微镜检查有纹理的 1 级商业纯钛的微观力学。研究发现，孪晶比滑移产生更大的硬化，(0002) 中产生的残余晶格应变约为 0.001，并且对于拉伸和压缩应变都观察到压缩和拉伸孪晶。发现的临界解析剪切应力与宏观流动曲线、晶格应变和产生的纹理一致，但远低于使用未经校正的聚焦离子束铣削微机械测试发现的剪切应力。在轴向压缩中观察到的孪晶比在环向压缩时观察到的孪晶更厚，这意味着轴向压缩产生了更多数量的孪晶位错，可能导致孪晶增厚。
The micromechanics of textured Grade 1 commercially pure titanium are examined using neutron diffraction, self-consistent modelling and microscopy. It is found that twinning produces greater hardening than slip, that the residual lattice strains produced in the (0002) are on the order of 0.001, and that both compression and tension twins are observed for both tensile and compression straining. The critical resolved shear stresses found are consistent with the macroscopic flow curves, lattice strains and textures produced, but are much lower than those found using uncorrected focused ion beam-milled micromechanical testing. The twins observed in axial compression were thicker than those found when compressing in the hoop direction, which is taken to imply that axial compression produced a greater number of twinning dislocations that could result in twin thickening.