Three-dimensional microstructure-based micromechanical modeling for TC6 titanium alloy

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• 作者：Guoju Li^a ; ^b ; Ran Shi^a ; ^b ; Qunbo Fan^a ; ^b ; ^{fanqunbo@bit.edu.cn} ; Yumeng Xia^a ; ^b ; Hongmei Zhang^a ; ^b
• 关键词：Titanium alloys ; X-ray tomography ; Nanoindentation ; Micromechanical modeling
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：8 February 2017
• 年：2017
• 卷：685
• 期：Complete
• 页码：327-331
• 全文大小：1155 K
• 卷排序：685

文摘

A new in-depth evaluation of the micromechanical response of TC6 (Ti–6Al–1.5Cr–2.5Mo–0.5Fe–0.3Si) titanium alloy subjected to uniaxial tensile loading is performed based on micromechanical modeling. This evaluation includes reconstruction of the three-dimensional annealed microstructure (annealing at 800 °C for 2 h, then air cooled) of the alloy via dual-energy micro-computed tomography. In addition, constitutive relations of the constituent phases were determined via synchrotron-based in-situ high-energy X-ray diffraction and a self-consistent model as well as nanoindentation tests combined with finite element modeling. The results revealed that the stress concentration was translated from the primary α phase to the secondary α phase, then to the β phase. Moreover, the stress generated was re-transferred to the primary α phase when the strain was increased from 0.00 to 0.05. This transfer is indicative of crack initiation in the primary α grains.