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7068-T6511/AA7068-T6高强度铝合金航空航天铝合金超硬铝合金化学成分力学性能
7068高强度铝合金是美国凯撒铝及化学公司(Kaiser Aluminium & Chemical Comp．)发明的，现已由先进金属材料国际集团公司(Advanced Metals International Group)投入生产。这种合金的力学性能比传统的7XXX系超强合金的高得多，其屈服强度高达700N／mm2，比7075合金的高15％—20％，可用于制造航空航天器、汽车的阀体、联杆，以及自行车与爬山器械零部件。
7068 aluminium alloy is the strongest commercially available aluminium alloy, and comparable to that of some steels. 7068-T6511 has typical ultimate tensile strength of 103 ksi (710 MPa) versus a similar product produced from 7075-T6511 that would have a typical ultimate tensile strength of 93 ksi (640 MPa). Typical yield strength for alloy 7068-T6511 is 99 ksi (680 MPa) versus 86 ksi (590 MPa) for a similar product produced from 7075-T6511.
Developed in the mid 1990’s by a world renowned aluminium producer, and extensively stocked and supplied in Europe by Smiths Advanced Metals, 7068 alloy is designed as a higher strength alternative to 7075 for ordnance applications. The highly attractive overall combination of mechanical properties (retained at elevated temperatures better than 7075) and other important characteristics of 7068 have resulted in the widespread specification of the alloy to markedly reduce the weight/cross section or significantly increase the strength of critical components in diverse market sectors.
7068 alloy provides the highest mechanical strength of all aluminium alloys and matches that of certain steels. This outstanding alloy combines a yield strength of up to 700 MPa (up to over 30% greater than that of 7075 alloy) and good ductility with corrosion resistance similar to 7075 and other features beneficial to high performance component/equipment designers.
7068 alloy is a 7000 series aluminium-zinc alloy registered with the US Aluminium Association and produced to AMS 4331 (chemical composition and mechanical properties) and AMS 2772 (heat treatment). 7068 alloy ‘A’ and ‘B’ tensile data and fatigue properties have been ratified for inclusion in MIL Handbook 5 / MMPDS. The standard supply temper condition is T6511. For applications requiring greater resistance to stress corrosion cracking the T76511 condition is available to order.
详细的文档下载：(Click here for 7068 data sheet)
Introduction
Aluminium / aluminum is a light-weight metal with a bright silvery luster. This metal along with its alloys are in high demand worldwide.
Aluminium / aluminum 7068 alloy is a heat treatable wrought alloy with good fatigue strength, good anodizing response, and high thermal conductivity. It was designed as a higher strength alternative to aluminium/aluminum 7075 for ordnance applications. It also provides the highest mechanical strength of all aluminium / aluminum alloys.
The following datasheet will provide more details about aluminium / aluminum 7068 alloy.
Chemical Composition
The following table shows the chemical composition of aluminium / aluminum 7068 alloy.
| Element | Content (%) |
|---|---|
| Zinc, Zn | 8.3 |
| Magnesium, Mg | 3 |
| Copper, Cu | 2.4 |
| Iron, Fe | 0.15 |
| Zirconium, Zr | 0.15 |
| Silicon, Si | 0.12 |
| Manganese, Mn | 0.1 |
| Titanium, Ti | 0.1 |
| Chromium, Cr | 0.05 |
| Other (each) | 0.05 |
| Other (total) | 0.15 |
| Aluminum, Al | Remainder |
Physical Properties
The physical properties of aluminium / aluminum 7068 alloy are outlined in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 2.85 mg/cm³ | 0.103 lb/in³ |
| Melting point | 476-635 ºC | 890-1175 ºF |
Mechanical Properties
The mechanical properties of aluminium / aluminum 7068 alloy are tabulated below.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 641 MPa | 93 ksi |
| Yield strength | 590 MPa | 85.7 ksi |
| Elongation | 8% | 8% |
Thermal Properties
The thermal properties of aluminium / aluminum 7068 alloy are tabulated below.
| Properties | Metric | Imperial |
|---|---|---|
| Thermal conductivity | 190 W/mK | 1317 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to aluminium / aluminum 7068 alloys are listed below:
- AMS 4331
- AMS 2772
Fabrication
The machinability of aluminium / aluminum 7068 alloy is good and matches that of aluminium / aluminum 7075 alloy; however welding should be performed with expert advice. Anodizing of this alloy is possible using all the traditional techniques. When performing hard anodizing, the surface becomes more abrasion resistant.
Applications
Aluminium / aluminum 7068 alloy is chiefly used in the following areas:
- Connecting rods
- Autosport gearbox actuators and wheel components
- Prosthetic limbs
- Load cells
- Hydraulic valve components
- High pressure solenoids
- Flexible shaft coupling
- Snowmobile engine shafts
- Automobile shock absorbers
- Fuel pumps for racing engines
- Motorcycle gears
- Recreational products such as tents, ski and backpack rods, bicycles and mountain climbing equipment
- Automotive valve body and connecting rod
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