Pure scandium powder is mainly used as additive and modifier in alloy materials. The addition of Sc to aluminum and aluminum alloys can effectively improve the comprehensive properties of the alloys. For example, the strength, hardness, heat resistance, corrosion resistance and weldability of the alloy are obviously improved. If Sc ≤ 0.4% is added to Al, a new Al3Sc phase can be formed to refine the alloy structure, increase the recrystallization temperature by 150~200 ℃, and improve the strength, hardness and heat resistance of the alloy. If Sc0.75% is added to Al Mg Zr, the Al Si Mg Zr alloy is formed, and its practical performance is better. If Sc0.3~1.0% is added to A1 Li Mg Zr, the alloy has better properties.
The above A1 SC alloy can also prevent embrittlement when working at high temperature for a long time. Therefore, it can be used as an excellent structural material, and has been used in aerospace, aviation, missile, automobile and ship structural components, which is a great potential of A1 SC new alloy.
In addition, after adding Sc, the tensile strength of AI Mg (2-8.1) - Sc (O.4%) alloy after aging treatment is increased by 20.35%, the flow limit is increased by 60.80%, and the elongation is increased by 20.25%. As in alloy MgY (11%) After adding Sc1l% to Mn (0.6%), the flow limit is 60-80Pa after aging treatment at 300 ℃. If Sc is added into GaSc, it can be made into an excellent cermet binder and advanced coating material.
For example, after adding Sc to TnC, its hardness increases to close to that of diamond. If ScB2 is generated after adding Sc to boron, it can be used as a light heat-resistant alloy and cathode component for electron guns.
