TY - JOUR
T1 - Experimental and numerical investigations of the effects of the spatial distribution of α phase on fracture behavior in hypoeutectic Al-Si alloys
AU - Qian, L.
AU - Toda, H.
AU - Nishido, S.
AU - Kobayashi, T.
N1 - Funding Information:
L.Q. gratefully acknowledges the Japanese Society for the Promotion of Science (JSPS) for financial support through a JSPS fellowship, and a Grant-in-aid for Scientific Research through Subject No. 16.04370. The support from the Light Metal Educational Foundation to H.T. is also gratefully acknowledged.
PY - 2006/10
Y1 - 2006/10
N2 - A uniform, fine α phase microstructure enhances the mechanical properties of Al-Si alloys; however, it is an open question as to how the α phase affects the crack growth behavior. This paper addresses the effects of the morphology and distribution of α phase on the fracture behavior in a model dual-phase Al-7% Si alloy with different microstructures. The influences of microstructural factors on crack growth behavior are examined using in situ experiments. The results show that a globular α phase microstructure produces a straight crack growth path, whereas a dendritic, orientational α phase microstructure leads to a deflected crack profile. Finite-element modeling is performed to simulate the fracture behavior, and to rationalize the observed phenomena. The near-tip J-integral-based fracture criterion is used to predict the fracture path. Numerical results indicate that a variation in the morphology and distribution of α phase changes the symmetry and intensity of the near-tip stress, strain and displacement fields due to the strong mismatch in elastic-plastic properties of the α phase and eutectic phase, which have major influences on both crack growth direction and crack tip driving force.
AB - A uniform, fine α phase microstructure enhances the mechanical properties of Al-Si alloys; however, it is an open question as to how the α phase affects the crack growth behavior. This paper addresses the effects of the morphology and distribution of α phase on the fracture behavior in a model dual-phase Al-7% Si alloy with different microstructures. The influences of microstructural factors on crack growth behavior are examined using in situ experiments. The results show that a globular α phase microstructure produces a straight crack growth path, whereas a dendritic, orientational α phase microstructure leads to a deflected crack profile. Finite-element modeling is performed to simulate the fracture behavior, and to rationalize the observed phenomena. The near-tip J-integral-based fracture criterion is used to predict the fracture path. Numerical results indicate that a variation in the morphology and distribution of α phase changes the symmetry and intensity of the near-tip stress, strain and displacement fields due to the strong mismatch in elastic-plastic properties of the α phase and eutectic phase, which have major influences on both crack growth direction and crack tip driving force.
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U2 - 10.1016/j.actamat.2006.06.036
DO - 10.1016/j.actamat.2006.06.036
M3 - Article
AN - SCOPUS:33748955216
VL - 54
SP - 4881
EP - 4893
JO - Acta Materialia
JF - Acta Materialia
SN - 1359-6454
IS - 18
ER -