TY - JOUR
T1 - Microstructure and mechanical properties of Ti/W and Ti-6A1-4V/W composites fabricated by powder-metallurgy
AU - Frary, M.
AU - Abkowitz, S.
AU - Abkowitz, S. M.
AU - Dunand, D. C.
PY - 2003/3/15
Y1 - 2003/3/15
N2 - Tungsten-reinforced Ti and Ti-6Al-4V composites were fabricated by powder metallurgical techniques from Ti, W and Al-V powders. The microstructure of the composites consists of partially dissolved tungsten particles within an α/β titanium matrix containing tungsten in solid-solution. Yield and ultimate tensile strengths increase linearly with tungsten content in the 0-15 wt.% W and decrease near-linearly with temperature in the range 25-540 °C. Ductility follows the opposite trend and is within technologically acceptable values, except for Ti/15W at 315 and 425 °C and Ti/10W at 540 8C which fractured near the ultimate stress value. The Ti-6Al-4V/10W composite shows the best combination of high strength and ductility at all temperatures. At ambient temperatures, Ti/10W exhibits a stress-strain curve very similar to Ti-6Al-4V (with a slight decrease in stiffness), while eliminating aluminum and vanadium alloy elements. Further improvements in mechanical properties of these non-equilibrium composites are likely to be achieved through optimized heat-treatments, which affect the matrix microstructure and the degree of dissolution of tungsten and thus the relative importance of matrix solid-solution strengthening and composite strengthening.
AB - Tungsten-reinforced Ti and Ti-6Al-4V composites were fabricated by powder metallurgical techniques from Ti, W and Al-V powders. The microstructure of the composites consists of partially dissolved tungsten particles within an α/β titanium matrix containing tungsten in solid-solution. Yield and ultimate tensile strengths increase linearly with tungsten content in the 0-15 wt.% W and decrease near-linearly with temperature in the range 25-540 °C. Ductility follows the opposite trend and is within technologically acceptable values, except for Ti/15W at 315 and 425 °C and Ti/10W at 540 8C which fractured near the ultimate stress value. The Ti-6Al-4V/10W composite shows the best combination of high strength and ductility at all temperatures. At ambient temperatures, Ti/10W exhibits a stress-strain curve very similar to Ti-6Al-4V (with a slight decrease in stiffness), while eliminating aluminum and vanadium alloy elements. Further improvements in mechanical properties of these non-equilibrium composites are likely to be achieved through optimized heat-treatments, which affect the matrix microstructure and the degree of dissolution of tungsten and thus the relative importance of matrix solid-solution strengthening and composite strengthening.
KW - Mechanical properties
KW - Powder-metallurgy
KW - Ti/W and Ti-6A1-4V/W composites
UR - http://www.scopus.com/inward/record.url?scp=0037444143&partnerID=8YFLogxK
U2 - 10.1016/S0921-5093(02)00426-4
DO - 10.1016/S0921-5093(02)00426-4
M3 - Article
AN - SCOPUS:0037444143
SN - 0921-5093
VL - 344
SP - 103
EP - 112
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
IS - 1-2
ER -