Some common aluminum bronze alloys and their applications: This multipurpose alloy is widely utilized in gears, bushings, bearings, pumps, and valves in the chemical, marine, aerospace, and machine tool industries. C95500 is one of the most durable nonferrous alloys. It is used where high strength and low weight are required such as in aircraft engines.
Aluminum alloys are classified by both their major ingredient and their specific application. The three main types are aluminum (all purposes), brass (for lower temperature applications), and bronze (for higher temperature applications). Other specialty alloys include magnesium (for use in electric cars) and titanium (for use in medical devices).
Aluminum alloys can be further divided into two groups: strong and weak. Strong alloys have a tensile strength greater than 30 ksi, while weak alloys have a tensile strength less than 20 ksi. The strongest aluminum alloys contain more than 75% aluminum; the weakest contain less than 5%.
The term "bronze" is used to describe alloys that contain more than 95% copper. These alloys exhibit better resistance to corrosion and wear than aluminum alloys. However, they are also more brittle. Bronze gear teeth will not break like iron or steel teeth would if exposed to the same load for an extended period of time.
Because of the nickel content, C95500 aluminum bronze is one of the strongest non-ferrous alloys available. The alloy has an extremely high yield, compressive strength, hardness, and elongation. It is used in applications where maximum strength under compression is required.
Other alloys with similar properties include C14250 copper bronze and C18200 steel. These materials are not recommended for use as structural members because they lack resistance to fracture.
Bronze alloys contain less than 1% silver and are heated above 1000 degrees Celsius (1800 degrees Fahrenheit) to melt them down into their solid forms. Because silver has a higher melting point than other elements included in the alloy, it allows the bronze to maintain its shape even after cooling off.
The term "bronze" comes from the Greek word "brondes", which means "shiny". Bronze was originally produced by adding small amounts of copper to pure silver. However, modern bronze alloys also include zinc and other metals that function as fillers to increase strength while keeping the weight low enough to be practical.
Bronze has been used since ancient times for everything from tools to weapons to art. It is still used today in some countries for items such as bicycles, motorcycles, and cars.
It is the most common of all aluminum alloys. A commercially pure aluminum that has been strengthened with manganese (20 percent stronger than the 1100 grade). It is extremely corrosion resistant and workable. This grade is suitable for deep drawing, spinning, welding, and brazing. It is also used in extruded shapes such as tubing and window frames.
Aluminum alloys are available in many different grades. The quality of an alloy can be determined by its strength relative to weight. Higher-strength alloys are generally more expensive and less flexible than lower-strength alloys. But they require less material per unit length or mass. For example, an alloy with 70,000 psi (500 MPa) yield strength may only 0.5 oz (15 g) per ft3 (1.5 kg/m3), while one with 50,000 psi (350 MPa) would be 1.0 oz (30 g) per ft3 (2.5 kg/m3). These numbers don't take into account the fact that higher-strength alloys are usually more brittle and thus less tolerant of fabrication processes.
The two main types of aluminum alloys are structural and nonstructural. Structural alloys have greater than 10 percent magnesium and zinc content; these elements make the alloys harder and more resistant to corrosion. Nonstructural alloys do not contain these elements and are therefore less hard and more susceptible to corrosion.