Fatigue Crack Growth of Ultrafine Grained Pure Ti after Severe Plastic Deformation
Fatigue crack growth behavior of the ultrafine-grained pure Ti produced by ECAP was investigated. The ECAPed sample with a total strain of 4.6 showed nearly equiaxed grains with an average size of about 0.3 μm. After ECAP, the ultimate tensile strength was increased by 60%, while the tensile elongation was decreased by 31%. The ECAPed Ti showed much higher resistance in fatigue crack growth by about a factor of 4 over the whole +K due to plasticity-induced crack closure.
Byung Tae Ahn, Hyeongtag Jeon, Bo Young Hur, Kibae Kim and Jong Wan Park
C. Y. Hyun and H. K. Kim, "Fatigue Crack Growth of Ultrafine Grained Pure Ti after Severe Plastic Deformation", Solid State Phenomena, Vols. 124-126, pp. 1385-1388, 2007