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Why is boron used as a deoxidizer in copper alloys?

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A labeled diagram of the periodic table entry for boron shows its atomic number 5, symbol B, electron configuration, atomic weight range, and classification as a solid, weakly acidic, other nonmetal with a rhombohedral crystal structure at room temperature. — boron Properties of boron.

Boron is used in copper-base alloys as a deoxidizer and in high-conductance copper as a degasifier.1

This application is necessary because common gases, such as oxygen, nitrogen, carbon dioxide, and sulfur dioxide, are soluble in molten copper. The presence of these dissolved gases can significantly and negatively affect the mechanical and electrical properties of the solidified metal. By acting as a deoxidizer and degasifier, boron helps remove these impurities, ensuring the resulting copper alloy maintains its desired characteristics.21