Microstructural analiysis (performed at 2500 magnation) have shown a lamellar & structure at 
different degrees of fines; fine-grained-(sample-Pr 11), Pr 7 (coaser grain); Pr 8 and finaly Pr 10 
(coarse-grained) 
Sample — Pr 12 has also a coarsed Widmanstitten structure 
Quantitative Image analysis was done on Ti-6Al1-3,5Mo-1,7Zr samples quenched and aged 
Fig. 1 TNustrates for sample — Pr 11 the thickness of a phase lamelae: 
a)the size of thinner a lamellae is between 1,8 — 4,78 um and below 3,19 pum for intermetallic 
B - phase 
b) the adjacent regions of coarser o - lamellar has a thickness between 3,04 — 12.46 um, with 4.2 -- 
11,8 um, for  - phase 
c) the content of a and phases is 35,82 % for f phase and 64,18 % for a phase 
Figures and photomicrographs 
rola SA Lk 
ER Pr. 10 
EA dfn Lik 
- Pr. 11 
Form. 
} Pr. 9 Pr. 12 
Fig. 1 — SEM images of Ti-6al-3,5Mo-1,7Zr alloy quenched and aged — Pr 7 — 12 (X 2500) 
Pr > 
300