Pipe, wire, rod made of CuAl9Fe4
Grade: tinless pressure-treated bronze. It is resistant to corrosion, has a good mechanical, antifriction properties.
Industrial usage: aircraft engineering, mechanical engineering.
Percentage composition according to GOST 19175−78
|Al||8 — 10|
|Fe||2 — 4|
|Cu||84.3 — 90|
Coefficient of friction with lubricant = 0.004
Coefficient of friction without lubricant = 0.18
Alloy hardness: HB 10 -1 = 100 — 120 MPа
Point of melting = 1040°C
Mechanical characteristics of CuAl9Fe4 grade at 20 °C
|δ5 (%)||sT (MPa)||σv (MPa)|
Special feature of aluminium bronzes are extra strength-to-density ratio and improved mechanical properties. Iron refines grains and provides delay of recrystallizing. In order to harden an alloy, aluminium-iron bronze is exposed to thermohardening (t° 950°C), age-hardening at a temperature of 250−300°С for 2−3 hours. It is used in a manufacture of valve seats, bushings, worms, gears, screw boxes in mechanical engineering. Silicon provides increasing of mechanical properties, heat resistance, corrosion resistance, recrystallization temperature. It also increases antifriction properties, resistance to low temperatures. Aluminium-iron bronzes are used for pin bushes, gears, valves, essential parts in aircraft industry, etc. Zinc provides increasing of corrosion and technological properties. Aluminium-iron bronzes can be perfectly pressure-treated in cold or hot conditions. They are used in manufacture of worm screws, bushings, gears, which operate at a temperature of up to 250 ° C in marine shipbuilding.
Physical characteristics of CuAl9Fe4 grade
R 10 9(Ohm-m)
a 10 -6 (1/Degree)
E 10— -5 (MPa)
|— differential deposit at a process of the first crack appearing, %||å||— ultimate tensile strength (rupture strength), MPa||σv|
|— maximum shear stress, ultimate torsional strength, MPa||Jê||— elastic strength, MPa||σ0,05|
|— ultimate bending strength, MPa||σ bend||— conventional yield limit, MPa||σ0,2|
|— fatigue endurance limit during bending test with symmetrical load cycle, MPa||σ-1||— percentage elongation after rupture, %||δ5,δ4,δ10|
|— fatigue endurance limit during torsion test with symmetrical load cycle, MPa||J-1||— yield point (contraction), MPa||σc 0,05|
|— amount of load cycling||n||— relative shear, %||v|
|— specific electrical resistance, Ohmm||R and ρ||— short ultimate tensile strength, MPa||sv|
|— standard module of elasticity HPa||E||— contraction ratio, %||ψ|
|— properties getting temperature, Degree||T||— impact hardness, which is established on specimens with concentrators in accordance with V and U types, J/cm2||KCU and KCV|
|— heating capacity of alloy (heat conduction coefficient), V/(m°С)||l||— permanent change of form — yield point (proportionality), MPa||sT|
|— specific heat of alloy (temperature is 20°С), [J/(kg-deg)]||C||— Brinell hardness||HB|
|— density, kg/m3||pn and r||— Vicker’s hardness||HV|
|— lineal thermal expansion coefficient (in a temperature range of 20°С), 1/°С||a||— Rockwell hardness C||HRC|
|— long-time strength limit, MPa||σtТ||— Rockwell hardness B||HRB|
|— module of elasticity at a process of torsional shear, HPa||G||— Shore hardness||HSD|
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