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Microstructure‐Dependent Local Fatigue Cracking Resistance of Bimodal Ti–6Al–4V Alloys
Author(s) -
Zeng LingRong,
Lei LiMing,
Yang Jia,
Luo XueMei,
Zhang GuangPing
Publication year - 2018
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201700702
Subject(s) - materials science , grain boundary , microstructure , paris' law , lamellar structure , cracking , metallurgy , alloy , crack closure , titanium alloy , growth rate , phase (matter) , fracture mechanics , composite material , geometry , mathematics , chemistry , organic chemistry
The fatigue crack growth behavior of the bimodal Ti–6Al–4V alloys with two different volume fractions of the primary α phase ( α p ) of 76 and 36% is investigated by the in situ testing technique. The experimental results show that the crack growth rate of the α p = 36% Ti–6Al–4V alloy is lower than that of the α p = 76% one. The local fatigue crack growth rate is evidently decreased by the various boundaries including α p grain boundaries, boundaries between the α p phase and basketweave microstructure, and α / β lamellar interfaces. A criterion associated with the boundary characteristics is obtained to evaluate the grain boundary resistance to the fatigue crack growth in the engineering alloys.