MATERIALS most commonly used in TR components

Ti6AL4V

High strength aerospace grade Titanium Alloy, used in all fasteners. Produces a high strength fastener. Not to be confused with Titanium Iron as used by many RC companies.

Density 4.43 g/cc 0.160 lb/in³

Mechanical Properties Metric English Comments

Hardness, Brinell 379 379 Estimated from Rockwell C.

Hardness, Knoop 414 414 Estimated from Rockwell C.

Hardness, Rockwell C 41 41

Hardness, Vickers 396 396 Estimated from Rockwell C.

Tensile Strength, Ultimate 1170 MPa 170000 psi

Tensile Strength, Yield 1100 MPa 160000 psi

Elongation at Break 10.0 % 10.0 %

Modulus of Elasticity 114 GPa 16500 ksi Average of tension and compression

Compressive Yield Strength 1070 MPa 155000 psi

Notched Tensile Strength 1550 MPa 225000 psi K_t (stress concentration factor) = 6.7

Ultimate Bearing Strength 2140 MPa 310000 psi e/D = 2

Bearing Yield Strength 1790 MPa 260000 psi e/D = 2

Poissons Ratio 0.330 0.330

Charpy Impact 23.0 J 17.0 ft-lb V-notch

Fatigue Strength 160 MPa
@# of Cycles 1.00e+7 23200 psi
@# of Cycles 1.00e+7 K_t (stress concentration factor) = 3.3

700 MPa
@# of Cycles 1.00e+7 102000 psi
@# of Cycles 1.00e+7 Unnotched

Fracture Toughness 43.0 MPa-m½ 39.1 ksi-in½

Shear Modulus 44.0 GPa 6380 ksi

Shear Strength 760 MPa 110000 psi Ultimate shear strength

7075 T6

High strength Aluminium used in the process of manufacturing CVDs, Spools Pinion Gears. When used in conjuction with Aluminium Oxide provides a hard surface that provides a good bearing and scratch resistent surface.

Density 2.81 g/cc 0.102 lb/in³ AA; Typical

Mechanical Properties Metric English Comments

Hardness, Brinell 150 150 AA; Typical; 500 g load; 10 mm ball

Hardness, Knoop 191 191 Converted from Brinell Hardness Value

Hardness, Rockwell A 53.5 53.5 Converted from Brinell Hardness Value

Hardness, Rockwell B 87 87 Converted from Brinell Hardness Value

Hardness, Vickers 175 175 Converted from Brinell Hardness Value

Ultimate Tensile Strength 572 MPa 83.0 ksi AA; Typical

Tensile Yield Strength 503 MPa 73.0 ksi AA; Typical

Elongation at Break 11.0 % 11.0 % AA; Typical; 1/16 in. (1.6 mm) Thickness

11.0 % 11.0 % AA; Typical; 1/2 in. (12.7 mm) Diameter

Modulus of Elasticity 71.7 GPa 10400 ksi AA; Typical; Average of tension and compression. Compression modulus is about 2% greater than tensile modulus.

Poissons Ratio 0.330 0.330

Fatigue Strength 159 MPa
@# of Cycles 5.00e+8 23000 psi
@# of Cycles 5.00e+8 completely reversed stress; RR Moore machine/specimen

Fracture Toughness 20.0 MPa-m½ 18.2 ksi-in½ K(IC) in S-L Direction

25.0 MPa-m½ 22.8 ksi-in½ K(IC) in T-L Direction

29.0 MPa-m½ 26.4 ksi-in½ K(IC) in L-T Direction

Machinability 70 % 70 % 0-100 Scale of Aluminum Alloys

Shear Modulus 26.9 GPa 3900 ksi

Shear Strength 331 MPa 48000 psi AA; Typical