What are the effects of alloying elements on aluminum bronze

The effects of alloying elements on aluminum bronze are as follows:

Iron Fe:

1. Excessive iron in the alloy will precipitate needle-like FeAl3 compounds in the tissue, resulting in changes in mechanical properties and deterioration of corrosion resistance;

2. Iron slows down the diffusion of atoms in the aluminum bronze and increases the dobech stability. A small amount of iron can inhibit the “self-annealing” phenomenon of the brittleness of the aluminum bronze, significantly reducing the brittleness of the alloy, and adding 0.5-1% content makes the grain finer.

Manganese Mn:

1. Hot rolling cracking can be reduced by adding 0.3-0.5% manganese to binary aluminum bronze;

2. When a certain amount of iron is added into the manganese-aluminum bronze, iron can refine the grain, and there are fine particles of Fe-aluminum compounds in the microstructure, which improves the mechanical properties and wear resistance, but weakens the effect of manganese on the dobech stabilization.

Tin Sn:

1. No more than 0.2% tin will change the corrosion resistance of single-phase aluminum bronze in steam and slightly acidic atmosphere

Chromium Cr:

1. A small amount of chromium added to binary aluminum bronze is beneficial,

2. Hinder the alloy annealing heating grain growth, and significantly improve the hardness of the alloy after annealing.

3. Alloying elements affect the elements of white copper

Zinc Zn:

1. A large amount of soluble in copper-nickel alloy, play the role of solid solution strengthening, improve the strength and hardness, enhance the corrosion resistance.

Generally, rare earth elements are hardly solutely soluble with copper, but a small amount of rare earth metals, whether added singly or in the form of mixed rare earth, are beneficial to the mechanical properties of copper, and have little effect on the electrical conductivity of copper. Such elements can form high melting point compounds with impurities such as lead and bismuth in copper, forming fine spherical particles distributed in the grain, refining the grain and improving the high temperature plasticity of copper. In other words, the elongation and shrinkage of Cu alloy at 800 increased significantly with the increase of cerium content.