Table 84. Changes in Mechanical Properties of Titanium Alloys Due to Corrosion 





Exposure 

 (day) 



Depth 

 (ft) 



Tensile 



Strength 



Yield Strength 



Elongation 





Alloy 



Original 

 (ksi) 



% Change 



Original 

 (ksi) 



% Change 



Original 



(%) 



% Change 



Source 



75A 



123 



5,640 



87 



+4 



70 



+ 5 



30 



-5 



CEL (4) 



75A 



403 



6,780 



87 



+4 



70 



+4 



30 



-16 



CEL(4) 



75A 



751 



5,640 



87 



+4 



70 



+ 11 



30 



-15 



CEL (4) 



75A 



197 



2,340 



87 



+ 5 



70 



+8 



30 



-11 



CEL (4) 



75A 



402 



2,370 



87 



+6 



70 



+ 7 



30 



-13 



CEL (4) 



75A 

 75A fe 



181 



5 



87 



+8 



70 



+9 



30 



-18 



CEL (4) 



181 



5 



101 



+ 2 



84 



-1 



25 



-24 



CEL (4) 



0.15 Pd* 



181 



5 



66 



+ 3 



47 



+4 



28 



-33 



CEL (4) 



5Al-2.5Sn fc 

 5Al-2.5Sn fc 

 5Al-2.5Sn b 

 5AI-2.5Sn fe 



403 



6,780 



130 



+ 10 



123 



+ 10 



14 



-13 



CEL (4) 



751 



5,640 



130 



+ 4 



123 



+ 5 



14 



-11 



CEL (4) 



402 



2,370 



130 



+ 5 



123 



+4 



14 



-15 



CEL (4) 



181 



5 



138 



+4 



124 



+ 1 



17 



-20 



CEL (4) 



8 Mn 



402 



2,370 



132 



+ 2 



116 



+ 3 



12 



+ 33 



CEL (4) 



4A1-3MO-1V 



123 



5,640 



155 







115 



-3 



15 







NADC (7) 



4AI-3MO-1V 



403 



6,780 



155 



+ 2 



115 



+ 2 



15 







NADC (7) 



4A1-3MO-1V 



751 



5,640 



155 



-17 



115 



-29 



15 







NADC (7) 



4A1-3MO-1V 



1,064 



5,300 



155 



-8 



115 



-13 



15 



+ 7 



NADC (7) 



4A1-3MO-1V 



402 



2,370 



201 



+ 1 



180 



-2 



4 



+ 19 



CEL (4) 



7Al-12Zr 



123 



5,640 



132 



+ 1 



126 



+ 1 



17 



-24 



NADC (7) 



7Al-2Cb-lTa fo 



181 



5 



111 



+4 



98 



+ 1 



18 



-16 



CEL (4) 



6A1-4V 



123 



5,640 



172 



-3 



143 



+7 



5 







NADC (7) 



6A1-4V 



6A1-4V* 



403 



6,780 



140 



+ 16 



136 



+ 16 



14 







CEL (4) 



403 



6,780 



148 



+4 



139 



-1 



13 



-13 



CEL (4) 



6A1-4V 



751 



5,640 



172 







143 



+8 



5 



+50 



NADC (7) 



6A1-4V 

 6Al-4V fc 



751 



5,640 



140 







136 



+4 



14 







CEL (4) 



751 



5,640 



148 



+ 3 



139 



+4 



13 



-13 



CEL (4) 



6A1-4V 



197 



2,340 



172 



-27 



143 



-22 



5 



-40 



NADC (7) 



6A1-4V 



197 



2,340 



140 



+ 2 



136 



+ 3 



14 



+2 



CEL (4) 



6A1-4V 

 6A1-4V* 



402 



2,370 



140 



+ 7 



136 



+6 



14 



-1 , 



CEL (4) 



402 



2,370 



148 



+ 2 



139 



+ 1 



13 



-8 



CEL (4) 



6A1-4V 

 6Al-4V fc 



181 



5 



140 



+ 3 



136 



+ 2 



14 



-9 



CEL (4) 



181 



5 



138 



+ 3 



132 



-6 



14 



-29 



CEL (4) 



13V-llCr-3Al fo 

 13V-llCr-3Al fc 

 13V-llCr-3Al fo 

 13V-llCr-3Al fo 



403 



6,780 



144 



+ 18 



140 



+ 18 



9 



-2 



CEL (4) 



751 



5,640 



144 



+ 18 



140 



+20 



9 



+6 



CEL (4) 



402 



2,370 



144 



+6 



140 



+5 



9 



-22 



CEL (4) 



181 



? 



134 



+5 



126 



+8 



20 



-36 



CEL (4) 



Numbers refer to references at end of report. 

 '■, 

 Unrelieved butt weld across width of specimens, TIG process, nonconsumable tungsten electrode. 



238 



