Covers boron as an elemental metal and its alloys used in aerospace manufacturing, principally as a grain-refining additive in aluminium and titanium alloys and as a neutron-absorbing constituent in shielding materials, together with boron-based compounds such as boron carbide (B₄C) and boron nitride (BN) employed in hard coatings, refractory applications, and CVD-deposited thin films.
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