As its name suggests, sintered NdFeB is an alloy material based on the compound Nd₂Fe₁₄B, which is formed from neodymium (Nd), iron (Fe), and boron (B). However, sintered NdFeB is not a single-phase material. Its microstructure consists of three main phases: the Nd₂Fe₁₄B phase, which is the primary and functional phase, a boron-rich phase (also known as the Nd₁.₁Fe₄B₄ phase), and a neodymium-rich phase, often referred to as the rare-earth-rich phase. Among these, the Nd₂Fe₁₄B phase dominates and serves as