Written by AZoMSep 12 2002
Chemical Formula
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Ti8Al1Mo1V
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Background
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This near-alpha alloy was designed primarily for creep resistance up to 430°C (805°F). As such it has been used in aeroengine applications such as forged fan or compressor blades. The Ti-8-1-1 alloy has the highest tensile modulus and lowest density of any commercial titanium alloy.
Composition
Table 1. The composition of Ti8Al1Mo1V.
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C
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<0.08%
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Fe
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<0.3%
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N2
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<0.05%
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O2
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<0.12%
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Al
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7.35-8.35%
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Mo
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0.75-1.25%
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V
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0.75-1.75%
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H2 (bar)
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<0.0125
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H2 (forging)
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<0.015%
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Ti
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Balance
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Designations
Other designations for Ti5Al2.5Sn include:
• AMS 4915
• AMS 4916
• AMS 4972
• AMS 4973
• MIL –T-9046
• MIL –T-9047
• UNS R54810
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Key Properties
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Physical Properties
Table 2. Typical physical properties for T Ti8Al1Mo1V.
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Density g/cm3 (lb/ cu in)
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4.37 (0.157)
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Melting Range °C±15°C (°F)
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1538 (2800)
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Volume Electrical Resistivity ohm.cm (ohm.in)
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198 (78)
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Thermal Conductivity W/m.K (BTU/ft.h.°F)
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6.5 (45)
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Mean Co-Efficient of Thermal Expansion 0-100°C /°C (0-212°F /°F)
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8.5x10-6 (4.7)
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Mean Co-Efficient of Thermal Expansion 0-300°C /°C (0-572°F /°F)
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9.0x10-6 (5.3)
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Mean Co-Efficient of Thermal Expansion 0-550°C /°C (0-1022°F /°F)
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10.1x10-6 (5.6)
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Beta Transus °C±15°C (°F)
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1038 (1900)
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Mechanical Properties
Table 3. Typical mechanical properties for T Ti8Al1Mo1V.
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Tensile Strength MPa (ksi)
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897 (130)
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1021 (148)
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0.2% Proof Stress MPa (ksi)
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828 (120)
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924 (134)
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Elongation Over 2 Inches %
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10
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19
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Reduction in Area %
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20
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Elastic Modulus GPa (Msi)
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117 (17)
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Hardness Rockwell C
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36
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Specified Bend Radius <0.070 in x Thickness
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4.5
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Welded Bend Radius x Thickness
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6
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Charpy, V-Notch Impact J (ft.lbf)
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27 (20)
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Fabrication
• Weldability – Fair
• Forging – Rough 1010-1038°C (1850-1900°F), finish 1010°C (1850°F)
• Annealing – Single 788°C (1450°F), 8hr, FC, Duplex – single and 788°C (1450°F), 1hr, AC
• Stress Relief Annealing – Bar and forgings – 900 or 1010°C (1650-1850°F), 1hr, WQ or AC and 593°C (1110°F), 8hr, AC, 593-649°C (1100-1200°F), 1hr, AC.
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Applications
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As mentioned previously, this alloy is used in aeroengines for components such as fan or compressor blades due to its creep resistant properties.
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Source: Titanium Information Group.
For more information on this source please visit Titanium Information Group.
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