Abstract
The influence of microstructure on void formation, void growth and tensile fracture was investigated for the Ti-6A1-4V alloy, aged to yield strengths of approximately 110 ksi (758 MN/m2), 130 ksi (896 MN/m2) and 140 ksi (965 MN/m2). Void nucleation occurs at α-aged martensite interfaces for both equiaxed (E) and Widmanstätten plus grain boundary (W + GB)α structures as well as within α particles. Void growth appeared to depend on martensite plate lengths for a given aging treatment for Ea structures, whereas it depended on prior β grain size and grain boundary α thickness for W + GBα structures. Two separate critical crack size-fracture stress (corrected for necking) relationships were found for E and W + GBα structures. The fracture energy for both structures was lower than the corresponding fracture energy previously observed for the Ti-5.25Al-5.5V-0.9Fe-0.5Cu(Ti-5-5) alloy,2 and the lower ductilities of aged Ti-6A1-4V were ascribed to this lower fracture energy.
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Margolin, H., Mahajan, Y. Void formation, void growth and tensile fracture in Ti-6AI-4V. Metall Trans A 9, 781–791 (1978). https://doi.org/10.1007/BF02649787
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DOI: https://doi.org/10.1007/BF02649787