Fatigue deformation of TiAl base alloys
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pe superlattice (y) in the development of dislocation substructure d u r i n g fatigue deformation and the consequent effects of this on fatigue f r a c t u r e was studied. EXPERIMENTAL PROCEDURE Alloys of the required composition were cast as stick ingots and converted by Nuclear Metals, Inc., to powder form of- 35 mesh using a rotating electrode process. The powders were canned in Ti-6AI-4V cans and were hot extruded at 1400°C with an extrusion r a t i o of 26 : 1. The details of extrusion, the method of preparation of the specimens from the extruded rods and the specimen geometry a r e described e l s e where. 4 The composition of the alloys is shown in T a b l e I. P r i o r t o testing the specimens were annealed at 1200°C for 2 h in vacuum followed by furnace cooling t o room temperature. The microstructure of the undeformed specimens was studied by optical m i c r o -
T a b l e 1. C o m p o s i t i o n o f the A l l o y s ( i n W I Pet)
Element
Ti-A1 Alloy
Ti-Al-Nb Alloy
A1 C Nb S N O H Zn Fe W Ni Mg Mn Me Sn v Cu Ga
36.3 0.0088 ND% 0.001 0.008 670* 21.0"
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