Physical，chemical properties and application of Gr9 titanium alloy
2020-05-16
This article will introduce the physical,chemical properties and application of Gr9 titanium alloy for you.
Ti-3Al-2.5V(Gr9 titanium alloy):
Gr9 titanium alloy is an alpha-type titanium alloy with a nominal composition of Ti-3Al-2.5V, which was developed as a cold-workable material. Itsoffers 20 to 50% higher strength than commercially pure grades, but is more formable and weldable than Ti6Al4V.
Compostion of Ti-3Al-2.5V(Gr9 titanium alloy):
C
N
O
V
Al
Fe
H
Ti
Content
≤0.05%
≤0.02%
≤0.12%
≤3.0%-2.0%
≤3.5%-2.5%
0.0100%
0.013%
Balance
（Elemental Composition per ASTM B265）
Applications of Ti-3Al-2.5V(Gr9 titanium alloy):
Grade 9 titanium has excellent properties in good ductility, moderately high strength, excellent resistance to corrosion and can be used at higher temperatures than the Commercially Pure Grades 1 through 4. And it also can be hardened by cold work and aging.Because it has these performance,so Gr9 can be used in some common applications such as：medical pacemakerstennis racquetshydraulic tubinghoneycombgolf club shaftsbellowsbicycle frames
Properties of Ti-3Al-2.5V(Gr9 titanium alloy):
Physical Properties
Metric
English
Density
4.48 g/cc
0.162 lb/in³
Mechanical Properties
Metric
English
Hardness, Rockwell C
24
24
Tensile Strength, Ultimate
620MPa
89900psi
Tensile Strength, Yield
500MPa
72500psi
Elongation at Break
15 %
15 %
Tensile Modulus
100GPa
80.0GPa(@Temperature 230℃）
14500ksi
11600ksi(@Temperature 446℉）
Compressive Yield Strength
690MPa
100000psi
Poissons Ratio
0.30
0.30
Fatigue Strength
170MPa
@# of Cycles 1.00e+7280MPa
@# of Cycles 50000280MPa
@# of Cycles 1.00e+7380MPa
@# of Cycles 4000024700psi
@# of Cycles 1.00e+740600psi
@# of Cycles 5000040600psi
@# of Cycles 1.00e+755100psi
@# of Cycles 40000
Fracture Toughness
100MPa-m½
91.0ksi-in½
Shear Modulus
44.0GPa
6380 ksi
Electrical Properties
Metric
English
Electrical Resistivity
0.000127 ohm-cm
0.000127 ohm-cm
Thermal Properties
Metric
English
coefficient of thermal expansion
9.61 µm/m-℃
@Temperature 20.0 - 95.0 C
9.67 µm/m-℃
@Temperature 20.0 - 205 C
9.86 µm/m-℃
@Temperature 20.0 - 315 C
9.97 µm/m-℃
@Temperature 20.0 - 540 C
5.34 µin/in-F
@Temperature 68.0 - 203℉
5.37 µin/in-℉
@Temperature 68.0 - 401 F
5.48 µin/in-℉
@Temperature 68.0 - 599 F
5.54 µin/in-℉
@Temperature 68.0 - 1000℉
Melting Point
≤1700℃
≤3090℉
Specific Heat Capacity
0.525 J/g-℃
0.125 BTU/lb-℉
Thermal Conductivity
8.30W/m-K
@Temperature23.0 °C11.8W/m-K
@Temperature 315 °C57.6BTU-in/hr-ft²-°F
@Temperature73.4 °F81.9BTU-in/hr-ft²-°F
@Temperature 599 °FBeta Transus
935℃
1720℉
Fabrication：
• Forging – Rough 871-899°C (1600-1650°F), finish 843-871°C (1550-1600°F)
• Annealing – 593-760°C (1100-1400°F), 1-3hr, AC
• Solution Treating – 871-927°C (1600-1700°F), 15-20 min, WQ.
• Ageing – 482-510°C (900-950°F), 2-8hr, AC.
• Stress Relief Annealing – 316-649°C (600-1200°F),1-3 hrs, AC.
Other Standards for Ti3Al2.5 include:
• AMS 4943
• AMS 4944
• AMS 4945
• ASTM B265-20a Gr9 and Gr18
• ASTM B337 Gr9（Withdrawn 1997）
• ASTM B338-17e1 Gr9
• ASTM B348-19 Gr9
• ASTM B381-13（2019）Gr9
• MIL –T –9047• MIL –T –9046 AB5
• ASTM B264 Gr9（Withdrawn 1954）
• UNS R56320 Grade 9• ASTM F3046 - 13
• ASTM F2146 - 13• ASTM B863 - 19
• ASTM B367 - 13(2017)
• ASTM B861 - 19
• ASTM B338 - 17e1
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