| Title |
The Effect of α - Phase Morphology on the Microcrack initiation Behavior of a Ti - 6Al - 4V Alloy |
| Authors |
배기만(Ki Man Bae); 박찬경(Chan Gyung Park); 장영원(Young Won Chang); 이종수(Chong Soo Lee) |
| Abstract |
The purpose of this study is to investigate the deformation characteristics and microcrack initiation behavior depending on the microstructure of Widmanstatten-α(Wα) and equiaxed-α(Eα) in a Ti-6Al-4V Alloy. In Wα structure, microcracks were observed to form along the α/β interfaces, the colony boundaries and the grain boundary α layers both in tension and fracture tests. In Eα structure, most of microvoids were found to form at the α/β interfaces. The lower tensile strength and ductility of Wα structure was mainly due to the strain localization along the prior β grain boundaries and colony boundaries, which was preceded by the easy slip transfer through α/βinterfaces within the colony. The large increase in fracture toughness of Wα structure was, however, primarily attributed to the crack path deviation depending on the colony orientation. |