Aluminum-Copper Phase Formation
Aluminum-copper phase formation is the process where Al-Cu alloys assemble into new phases during melting and cooling. This increases mechanical strength through coherent lattice distortions.
Physical-Chemical Mechanism
Aluminum-copper phase formation occurs when aluminum and copper interact in an alloy structure. During thermal aging, new phases form from the two metals, creating coherent lattice distortions.
Metallurgical Relevance & Welding Risks
This phase formation increases the mechanical strength and toughness of the alloy. However, insufficient cooling or excessive copper content can lead to undesirable phases that contaminate the structure and reduce strength.
Workshop Practice & Instructions
To optimally utilize aluminum-copper phase formation, the melting time and temperature must be precisely controlled. A copper content of 3 to 5% is common for optimal phase formation. Uneven cooling can contaminate the structure, impairing strength.