Aluminum alloy-aluminum scandium alloy
Aluminum alloy is an important engineering material for national economic construction and national security. But so far, some of our country's high performance aluminum alloy preparation of the key technology has not broken through, many key models of high performance aluminum alloy materials still rely on imports, high performance aluminum alloy research and development there are a lot of work waiting for people to do.
There are several ways to improve the high performance of aluminum alloy, among which microalloying is the frontier of high performance aluminum alloy research in recent 20 years. The so-called microalloying strengthening and toughening usually refers to the addition or compound addition of trace elements less than 0.5% by mass percentage to aluminum alloy in order to greatly improve the alloy strength and toughness of a technology. Among them, the addition of scandium is particularly noticeable.
As a transition group element and rare earth element, scandium is added to aluminum and aluminum alloy, which can not only significantly refine the as-cast alloy grain, improve the recrystallization temperature and thus improve the strength and toughness of aluminum alloy, but also significantly improve the weldability, heat resistance, corrosion resistance, thermal stability and neutron irradiation resistance of aluminum alloy. Therefore, aluminum scandium alloy is considered as a new generation of high performance aluminum alloy structure material for aerospace, ships and weapons