TY - JOUR
T1 - Heterogeneous deformation and damage mechanisms in multi-phase TA15 Ti-alloy
T2 - Insights from experiments informed damage-crystal plasticity modelling
AU - Li, Yanxi
AU - Gao, Pengfei
AU - Zhan, Mei
AU - Jiang, Xueqi
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/7/19
Y1 - 2022/7/19
N2 - Understanding the mesoscale heterogeneous deformation and its induced material damage is significant to enhance the mechanical properties of polycrystalline aggregates. In this work, a damage-coupled crystal plasticity finite element (DC-CPFE) model based on high-fidelity microstructure was developed to investigate the heterogeneous deformation and damage behavior of TA15 Ti-alloy with tri-modal microstructure composed of globular alpha (αp), lamellar alpha (αl) and transformed beta (βt). A three-step procedure combining the nanoindentation test, stress relaxation test, and uniaxial tensile test was proposed to determine the material parameters in the crystal plasticity constitutive and damage models of the three constituent phases. Based on the developed DC-CPFE model, the heterogeneous slip modes and traces of tri-modal microstructure were predicted and analyzed. The heterogeneous deformation of tri-modal microstructure was found to be mainly caused by the heterogeneous deformation in α phases, which was featured by the deformation bands and local shear bands. Deformation bands occurred in both of the deformation-preferential and -lagged αp grains and the hard-to-deform αl grains. Local shear bands only produced in αl grains, which were related to both of the soft geometry orientation and the activation of prismatic slip systems. Meanwhile, the formation of deformation bands and local shear bands could be promoted by the local lattice rotation. The above heterogeneous deformation led to four types of damage, which were caused by the slip band intersection, the slip transfer impedance, the local shear band, and the property and orientation mismatches among the adjacent grains, respectively.
AB - Understanding the mesoscale heterogeneous deformation and its induced material damage is significant to enhance the mechanical properties of polycrystalline aggregates. In this work, a damage-coupled crystal plasticity finite element (DC-CPFE) model based on high-fidelity microstructure was developed to investigate the heterogeneous deformation and damage behavior of TA15 Ti-alloy with tri-modal microstructure composed of globular alpha (αp), lamellar alpha (αl) and transformed beta (βt). A three-step procedure combining the nanoindentation test, stress relaxation test, and uniaxial tensile test was proposed to determine the material parameters in the crystal plasticity constitutive and damage models of the three constituent phases. Based on the developed DC-CPFE model, the heterogeneous slip modes and traces of tri-modal microstructure were predicted and analyzed. The heterogeneous deformation of tri-modal microstructure was found to be mainly caused by the heterogeneous deformation in α phases, which was featured by the deformation bands and local shear bands. Deformation bands occurred in both of the deformation-preferential and -lagged αp grains and the hard-to-deform αl grains. Local shear bands only produced in αl grains, which were related to both of the soft geometry orientation and the activation of prismatic slip systems. Meanwhile, the formation of deformation bands and local shear bands could be promoted by the local lattice rotation. The above heterogeneous deformation led to four types of damage, which were caused by the slip band intersection, the slip transfer impedance, the local shear band, and the property and orientation mismatches among the adjacent grains, respectively.
KW - Crystal plasticity modelling
KW - Damage behavior
KW - Heterogeneous deformation
KW - Ti-alloy
KW - Tri-modal microstructure
UR - http://www.scopus.com/inward/record.url?scp=85132504593&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2022.143444
DO - 10.1016/j.msea.2022.143444
M3 - 文章
AN - SCOPUS:85132504593
SN - 0921-5093
VL - 848
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
M1 - 143444
ER -